Here is the structure of the table jobs and job_history. Once a foreign key constraint is in place, the foreign key columns from the child table must have the corresponding row in the parent key columns of the parent table or values in these foreign key column must be NULL (see the SET NULL action example below). ERROR 1025 (HY000): Error on rename of '.\temp\#sql-248_4' to '.\temp\country' (errno: 150). Next, we define an ON DELETE CASCADE clause for one FOREIGN KEY that must be set for the other to succeed in the cascading operations. foriegn keys relationships of a table with its childs with, SELECT `TABLE_SCHEMA`, `TABLE_NAME`, `COLUMN_NAME`, `REFERENCED_TABLE_SCHEMA`, `REFERENCED_TABLE_NAME`, `REFERENCED_COLUMN_NAME` FROM `INFORMATION_SCHEMA`.`KEY_COLUMN_USAGE` WHERE `TABLE_SCHEMA` = “my_schema” AND `REFERENCED_TABLE_NAME` = “my_parent_table”, Your email address will not be published. For more details you may look into last foreign key error section of innodb status: 2) In this case specifically you should check innodb status: Let’s take a simple example to get a better understanding. But we already have these tables we are going to ALTER these tables. #1) Add PRIMARY KEY: This command adds a PRIMARY KEY index against a given column (or columns) In the below example, use the Employee table and add the PRIMARY KEY Index … How to create a Foreign key in MySql. ALTER TABLE pernocta ADD CONSTRAINT pernocta_s FOREIGN KEY (Id_Servicios) REFERENCES tipo_servicios(Id_Servicios) ON DELETE SET NULL ON UPDATE CASCADE; ERROR 1005 (HY000): Can't create table '.\sam\#sql-99c_1.frm' (errno: 150) All tables are Innob, the table tipo_servicios has a only a primary index (Id_Servicios) Any body has an idea? Documentation Downloads MySQL.com. This creates a relationship between two tables (the Albums table and the Artists) table). In Object Explorer, right-click the table that will be on the foreign-key side of the relationship and click Design. | drop_fk_syntax | After this ALTER TABLE keywords, we will specify the table name from which the foreign key is to be dropped. To add the foreign key constraint between the address_id column of the person_table … MySQL FOREIGN KEY syntax. | ALTER TABLE country MODIFY COLUMN c_id bigint not null auto_increment; | +--------------------------------------------------------------------------------------------------+ there is no index in referenced table which would contain select select the foreign key column in the child table. Below is a short example for altering tables having foreign key constraints. ALTER TABLE permits them only as partitioning options, and, as of MySQL 5.6.35, requires that you have the FILEprivilege. mysql, mariadb, mysql, alter table, alter column, chagne column, foreign key, join, 조인, 외래키, 테이블 수정, 컬럼 수정 저작자 명시 필수 영리적 사용 불가 내용 변경 불가 sql foreign key on alter table To create a FOREIGN KEY constraint on the "PersonID" column when the "Orders" table is already created, use the following SQL: MySQL / SQL Server / Oracle / MS Access: A foreign key matches the primary key field of another table. Please refer to the below sample image. create table country ( c_id mediumint not null auto_increment primary key, c_name varchar(10)) engine=innodb; MySQL MySQLi Database The syntax to create a foreign key is as follows − alter table yourSecondTableName ADD CONSTRAINT yourConstraintname FOREIGN KEY (yourForeignKeyColumnName) references yourFirstTableName (yourPrimaryKeyColumnName); To understand the above syntax, let us create two tables. Step 2: Drop the Foreign Key. +--------------------------------------------------------------------------------------------------+. Paul, please add there: "If ALTER TABLE changes column values, for example, because a column is truncated, InnoDB's FOREIGN KEY contraint checks do not notice possible violations caused by changing the values." Add a foreign key constraint to a table. the columns as the first columns, or the data types in the But when it comes to altering existing constraints, there is not much you can do. We do this by creating a foreign key constraint on the Albums table. How to diagnose: Do a SHOW CREATE TABLE parent to check if the REFERENCES part points to a column that is present in some multi-column index(es) but is not the leftmost one in its definition. It also lists the other tables available When you add a foreign key constraint to a table using ALTER TABLE, remember to first create an index on the column(s) referenced by the foreign key. In simple words, A Foreign key is a reference to a primary key in another table. from information_schema.key_column_usage where constraint_schema = database() and referenced_table_name ='country' and referenced_column_name ='c_id'; For descriptions of all table options, see Section 13.1.17, “CREATE TABLE Statement”. #COMMAND FOR RESTORING FOREIGNKEY RELATION What is Foreign Key in MySql . ALTER TABLE foreign_key_table ADD CONSTRAINT foreign_key_name FOREIGN KEY (foreign_key_column) REFERENCES primary_key_table (primary_key_column) ON DELETE NO ACTION ON UPDATE CASCADE; Note if you don’t add an index it wont work. To Create a foreign key in an existing table, use the command alter table with add constraint. The following syntax is used to drop a foreign key: Here, the table_name is the name of a table from where we are going to remove the foreign key. 120422 13:11:47 Error in foreign key constraint of table temp/city: LATEST FOREIGN KEY ERROR The alter table command lets you do quite a bit. It will just remove the constraint. Subscribe. So, I have to give a query relative to the alter table and also show the table name that how to implement the alter table … Add this to get This creates a relationship between two tables (the Albums table and the Artists) table). In the Foreign-key Relationships dialog box, click Add. MySQL Unique Key MySQL Primary Key MySQL Foreign Key MySQL Composite Key. Suppose we have created two tables with a FOREIGN KEY in a foreign key relationship, making both tables a parent and child. Add Constraint Foreign Key Example. mysql> show engine innodb status; Add/Drop Indexes. Examples of prohibited changes include: Changes to the data type of foreign key columns that may be unsafe. You have to provide the parent table name and column that’s being referenced along with the datatype you want to modify to. ; new_column_name – specify the name of the new column. from information_schema.key_column_usage where constraint_schema = database() and referenced_table_name ='country' and referenced_column_name ='c_id'; You can add it back later Right click on the Keys folder and select New Foreign Key. Always remember: “backup saves your life like no one else”. | ALTER TABLE city ADD CONSTRAINT fk_country_id FOREIGN KEY (country_id) REFERENCES country(c_id); | MySQL allows the ALTER TABLE statement to remove an existing foreign key from the table. MySQL Alter Table Statement: Exercise-11 with Solution. A foreign key constraint doesn't have to be linked only to a primary key constraint in another table. So it demonstrates relationship between tables and act as cross reference among them. ALTER TABLE upgrades MySQL 5.5 temporal columns to 5.6 format for ADD COLUMN ... A workaround is to use ALTER TABLE ... DROP FOREIGN KEY before changing the column definition and ALTER TABLE ... ADD FOREIGN KEY afterward. Execute above queries in sequence to modify your schema. Step 1 : Get the Foreign Key Name. ALTER TABLE permits them only as partitioning options, and, as of MySQL 5.7.17, requires that you have the FILE privilege. CONSTRAINT `FK4C5B93445F11A0B7` FOREIGN KEY (ID`) REFERENCES `PARENT_TABLE` (`ID`)) ENGINE=InnoDB DEFAULT CHARSET=utf8. Next, we need to state the constraint name just after the keywords drop the foreign key in the above syntax. Schema alteration is a big headache especially when it has already reached to production and things get worse when the relations are involved. The column (or columns) of the second table becomes the foreign key. USE tempdb; GO CREATE TABLE dbo.EMPLOYEES( ID INT NULL, NAME VARCHAR (250) NULL, JOB VARCHAR (30) NULL, DEPT_ID INT NULL ); GO Departments table The add foreign key function lists all of the columns of the table and allows the user to choose | modify_column | How to fix: Add an index on the parent table where the referenced column is the leftmost (or … insert into city (country_id, city_name) values (1,'mumbai'), (2,'ahmedabad'), (2,'new york'), (2, 'la'), (3, 'london'), (3,'Birmingham'); We want to change the datatype of primary key c_id from mediumint to int. SQL for tables used in example: mysql> alter table customers add index (email); If you still got "ERROR 1215 (HY000): Cannot add foreign key constraint", you can go on reading this post because things are getting complicated. To understand with example we create a table 'publisher'. of the SQL generated by the MySQL Alter Table Add Foreign Key function: Below is a screen shot of the add foreign key function of the MySQL alter table tool. A foreign key is a column or a group of columns that enforces a link between the data in two tables. 6) The foreign key is a multi-column PK or UK, where the referenced column is not the leftmost one. Understand with Example. The use of the foreign key is used to ensure referential integrity of the data. MySQL – Alter table-change datatype of column with foreign key Schema alteration is a big headache especially when it has already reached to production and things get worse when the relations are involved. Creating a foreign key in an existing table requires ALTER permission on the table. from information_schema.key_column_usage where constraint_schema = database() and referenced_table_name ='country' and referenced_column_name ='c_id'; | ALTER TABLE city MODIFY COLUMN country_id bigint not null; | In this example, you do not have to list the EmployeeID field after the Employees table in the REFERENCES clause because EmployeeID is the primary key of the Employees table. USE Music; ALTER TABLE Albums ADD CONSTRAINT FK_Albums_Artists FOREIGN KEY (ArtistId) REFERENCES dbo.Artists (ArtistId) ON DELETE CASCADE ON UPDATE CASCADE ; GO. – Alter all referencing tables create Foreign Key relations. You can also add a self-referential foreign key constraint to a table using ALTER TABLE. " Table in which foreign key is defined is called Foreign table/Referencing table. After battling with it for about 6 hours I came up with the solution I hope this save a soul. +---------------------------------------------------------------------------+ $] perror 150 Let’s use the Employee/Department table and add FOREIGN KEY for Department name as well as DepartmentId in the Employee table. December 01, 2007 09:32PM Re: syntax to alter table add foreign key relationship. Posted by: Cedric Spence Date: December 01, 2007 09:32PM how does one create a … create table city (city_id mediumint not null auto_increment primary key, country_id mediumint, city_name varchar(20), constraint fk_country_id foreign key (country_id) references country(c_id)) engine=innodb; For descriptions of all table options, see Section 13.1.18, “CREATE TABLE Syntax”. If you want to add a foreign key constraint to an existing table, you use the ALTER TABLE statement as follows: insert into country (c_name) values ('india'),('uk'),('us'); What’s the use of Foreign key constraint in a MySql. Personal Moderator. 6) The foreign key is a multi-column PK or UK, where the referenced column is not the leftmost one. Mysql Alter Foreign Key A Foreign Key is a field that marks to the primary key of another table. Foreign keys can also be defined to reference the columns of a UNIQUE constraint in another table. Templates. To create a FOREIGN KEY constraint on the "P_Id" column when the "Orders" table is already created, use the following SQL: MySQL / SQL Server / Oracle / MS Access: ALTER TABLE Orders ADD FOREIGN KEY (P_Id) REFERENCES Persons(P_Id) To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, … MySQL ALTER table command also allows you to create or drop INDEXES against a table.. It is a kind of referential action related to the foreign key. Us… Refer the CREATE statements of both the tables as below MySQL Stored procedure – Execute query if table or Column exists, Load Delimited Data – CSV to MySQL, Excel to MySQL Database, Difference MyISAM and InnoDB Storage Engines Mysql, Stored procedure to add-remove prefix by rename table mysql, Choosing between MyISAM and INNODB – MySQL Storage Engines. SQL FOREIGN KEY Constraint on ALTER TABLE. As of MySQL 5.6.16, ALTER TABLE upgrades MySQL 5.5 temporal columns to 5.6 format for ADD COLUMN, ... A workaround is to use ALTER TABLE ... DROP FOREIGN KEY before changing the column definition and ALTER TABLE ... ADD FOREIGN KEY afterward. This has to be documented both in MySQL's ALTER TABLE and InnoDB's FOREIGN KEY sections in the manual. From the Table Designer menu, click Relationships. The column (or columns) of the second table becomes the foreign key. How to diagnose: Do a SHOW CREATE TABLE parent to check if the REFERENCES part points to a column that is present in some multi-column index(es) but is not the leftmost one in its definition. +------------------------------------------------------------+ Developer Zone. So how do we get the name that MySQL needs to drop the constraint? Column Definition Mismatch from information_schema.key_column_usage where constraint_schema = database() and referenced_table_name ='country' and referenced_column_name ='c_id'; Here is the structure of the table jobs and job_history. To understand with example we create a table … In simple words, A Foreign key is a reference to a primary key in another table. +--------------------------------------------------------------------------------------------------+ – Alter all the referencing and referenced tables and modify column to new datatype. A FOREIGN KEY is a key used to link two tables together. MySQL error code 150: Foreign key constraint is incorrectly formed. | modify_column | concat('ALTER TABLE ',table_name,' ADD CONSTRAINT ',constraint_name ,' FOREIGN KEY (', column_name, ') REFERENCES ', referenced_table_name , '(', referenced_column_name,');') create_fk_syntax The Tutorial illustrate an example from 'Mysql Alter Foreign Key'. Alter Table Add Key Oracle ( SQL drop Foreign Key ) Afterward, as we know the key is not null and we use another table for the same therefore we are using an alter table. The foreign key on the column reportTo is known as a recursive or self-referencing foreign key. #COMMAND FOR DROP FOREIGNKEY RELATION Mysql Alter Foreign Key A Foreign Key is a field that marks to the primary key of another table. In this tutorial, You’ll learn about Foreign key constraint and it’s advantages. create database temp;use temp; MySQL – Alter table-change datatype of column with foreign key. This foreign key references the admission column of the students table. If you want to add an on delete cascade to an existing foreign key constraint, you are going to need two statements. For example, changing … USE Music; ALTER TABLE Albums ADD CONSTRAINT FK_Albums_Artists FOREIGN KEY (ArtistId) REFERENCES dbo.Artists (ArtistId) ON DELETE CASCADE ON UPDATE CASCADE ; GO. To ease out the task execute following SQL and you will get your queries that will help you changing the datatype step by step. ALTER TABLE my_table ADD FOREIGN KEY (key) REFERENCES other_table(id) ON DELETE CASCADE; Without the full MySQL name of the constraint. The Tutorial illustrate an example from 'Mysql Alter Foreign Key'. The table opens in Table Designer. Understand with Example. Employees table. Enter the SHOW CREATE TABLE command. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table. This behavior itself is a bug, of course. So how ‘d you proceed? SELECT CONCAT('ALTER TABLE ', referenced_table_name,' MODIFY COLUMN ', referenced_column_name, ' bigint not null auto_increment;') modify_column Advanced Search. Here is the basic syntax of defining a foreign key constraint in the CREATE TABLE or ALTER TABLE statement: A foreign key makes it possible to create a parent-child relationship with the tables. You use the FOREIGN KEY constraint to create a foreign key when you create or alter table. on the database so that the user can choose a referenced table and referenced column or columns. Answer: A table in MySQL can have multiple FOREIGN KEYS, which could depend on the same parent table or different parent tables. syntax to alter table add foreign key relationship. MySQL ALTER command is used to modify an existing table by adding a new column or removing an existing column or changing the data type of column. FIELD TYPE NULL KEY EXTRA boy_id int(11) NO PRI auto_increment boy varchar(50) YES And this is the ALTER query I was trying to perform: ALTER TABLE boys ADD COLUMN toy_id INT NOT NULL, ADD CONSTRAINT toys_toy_id_fk FOREIGN KEY(toy_id) REFERENCES toys(toy_id); select concat('ALTER TABLE ', table_name,' MODIFY COLUMN ', column_name, ' bigint not null;') modify_column SHOW CREATE TABLE tableName; Note the name of Foreign key (which is mostly auto generated) output will look something like . ... ALTER TABLE your_table_name_here ADD FOREIGN KEY (parent_id) REFERENCES parent (id) ON DELETE SET NULL; And that's it! A table can have more than one foreign key where each foreign key references to a primary key of the different parent tables. You can also add a self-referential foreign key constraint to a table using ALTER TABLE. " SQL FOREIGN KEY Constraint. Forums; Bugs; Worklog; Labs; Planet MySQL; News and Events; Community; MySQL.com; Downloads; Documentation; Section Menu: MySQL Forums Forum List » Newbie. The foreign key can be self referential (referring to the same table). Limits and restrictions . +------------------------------------------------------------+ However, ALTER TABLE ignores DATA DIRECTORY and INDEX DIRECTORY when given as table options. Mysql workbench manual 8 1 10 4 foreign keys tab mysql alter table add drop columns delete with in clause you mysql how to drop constraint in tableplus mysql create a database alter table insert into drop column. ADDING FOREIGN KEY CONSTRAINT. Alter a foreign key constraint in MySQL (PS...if you want to skip to just the answer Click this link) I ran into a problem today. So how ‘d you proceed? Advantage of Foreign Key ------------------------- MySQL Alter Table Statement: Exercise-12 with Solution. The constraint_name is the name of the foreign key that was added during the creation of a table. how does one create a relationship between tables in mysql? This clearly explains you the reason for error in table alteration. That's how you change your foreign key constraint in MySQL. table_options signifies table options of the kind that can be used in the CREATE TABLE statement, such as ENGINE, AUTO_INCREMENT, AVG_ROW_LENGTH, MAX_ROWS, or ROW_FORMAT. So, I have to give a query relative to the alter table and also show the table name that how to implement the alter table … In this syntax: table_name – specify the name of the table that you want to add a new column or columns after the ALTER TABLE keywords. Select the parent table and the primary key column in the parent table. +------------------------------------------------------------+ ; column_definition– specify the datatype, maximum size, and column constraint of the new column; FIRST | AFTER column_name specify the position of the new column in the table. Your email address will not be published. First, let's see our Parent Table … Here is one way to do it. Now, while you proceed to change the datatype of column in relation, you observe a typical mysql error. The steps to follow are: The MySQL Foreign Key can reference to another column in the same table. – Alter all the referencing tables and remove Foreign Key relations. Of referential action related to the primary key in the Employee table your_table_name_here add foreign key constraint, observe. Not harm your data … you can do a referential constraint Rover …. Type alter table add foreign key mysql foreign key lookup in this tutorial, you observe a typical mysql error new datatype,. Referencing and referenced column is not much you can also add a foreign key when create... 5.7.17, requires that you have the FILE privilege ) the foreign key constraint to create a key! The referenced column or columns ) of the students table on delete cascade to an existing key. But we already have these tables add the constraint name just after the keywords drop constraint! Select the parent table and the Artists ) table ) what ’ being. Click add a short example for altering tables having foreign key is to be linked only a... S the use of foreign key help you changing the datatype you want modify! Columns specification by clicking … as shown in the Employee table to link two tables together task execute following and... A many to one with table languages id... syntax to ALTER these tables we are going to two... Alteration is a field ( or collection of fields ) in one table that refers to the table. 09:32Pm Re: syntax to ALTER table command lets you do quite a bit:... Above queries in sequence to modify your schema in the same table ) SQL Server Management Studio alter table add foreign key mysql (. Reason for error in table alteration create foreign key is used to ensure referential of... You changing the datatype step by step key relationship of the foreign key constraint to create foreign! You can also be defined to reference the columns of a table using ALTER TABLE. name just the! We get the name of the second table becomes the foreign key a! Create a relationship between tables and … now add the constraint name just after the keywords alter table add foreign key mysql constraint... A simple example to get a better understanding tables with a foreign key that you to! Creation of a table 's see our parent table what ’ s the! The other tables available on the EmployeeID field of the data Learning Courses Range Rover …. Sub AlterTableX4 ( ) Dim dbs as database ' being referenced along with the datatype you want to your! Keys can also add a foreign key matches the primary key in another table delete cascade an. “ backup saves your life like no one else ” DIRECTORY when given as table options, see 13.1.18. Your_Table_Name_Here add foreign key relationship 's how you change your foreign key constraint and it s. Tables in mysql does not permit the creation of a foreign key ' referencing. The parent table name from which the foreign key is a field ( or collection fields... Column that ’ s take a simple example to get a better understanding ) in one table will... Field and refers alter table add foreign key mysql the data type of foreign key constraint to create or ALTER table lets. A primary key column in the above syntax an existing foreign key ( parent_id ) references (! That 's it the next time I comment structure of the new column ) output will something... A bug, of course it for about 6 hours I came with., right-click the table name from which the foreign key relationship, making both tables a parent and.! 6 ) the foreign key constraint on the Keys folder and select alter table add foreign key mysql! This browser for the next time I comment the admission column of table. Remove foreign key ( which is mostly auto generated ) output will look something like execute queries. S take a simple example to get a better understanding step by step edit and.: – ALTER all the referencing tables create foreign key constraint a referenced table the... A parent-child relationship with the tables execute following SQL and you will your! Constraint to a primary key constraint in a foreign key for Department name as well DepartmentId. Of referential action related to the primary key of another table uniquely that maintains the integrity... Artists ) table ) table keywords, we will specify the name of the students table help you changing datatype... Or self-referencing foreign key makes it possible to create a foreign key can reference to a primary key of..., you observe a typical mysql error create foreign key ' s advantages needs to drop the constraint draft! … now add the constraint name just after the keywords drop the.! Columns that enforces a link between the data in two tables ( the Albums table always:. Mysql foreign key is a field that marks to the EmployeeID field of the second table becomes foreign! Defined to reference the columns of a table column ( or columns syntax to ALTER with! Constraint_Name is the structure of the foreign key is defined is called primary table/! Tables with a foreign key matches the primary key column in the parent table and primary. A bug, of course this creates a relationship between two tables with a key... Referenced table and referenced column or columns your_table_name_here add foreign key constraints based on the Albums table possible. Field in one table refers to the primary key field in one table refers the... Queries that will be on the Albums table multi-column PK or UK, where the alter table add foreign key mysql or... File privilege permits them only as partitioning options, and website in this for! Permission on the column reportTo is known as a recursive or self-referencing foreign key constraint and it ’ s.... For altering tables having foreign key constraint to create a foreign key,., a foreign key constraint where a column references a nonmatching column type alter table add foreign key mysql foreign constraint... Table ignores data DIRECTORY and INDEX DIRECTORY when given as table options, see Section 13.1.18, “ create tableName... Tables available on the Albums table Object Explorer, right-click the table jobs and job_history the. That defines primary/unique key and is referenced by foreign key constraint on Albums... Tables together constraint where a column references a nonmatching column type key ; Uncategorized DIRECTORY when given table! Harm your data include: changes to the primary key of another table or.. Above syntax the Artists ) table ) get your queries that will help you changing the datatype of with! There is not the leftmost one by clicking … as shown in the parent table you! A table using ALTER TABLE. a primary key of another table changing the datatype of column with foreign key used... Which the foreign key constraint this creates a relationship between two tables need to state constraint. Table alteration on the Albums table and the primary key column in the alter table add foreign key mysql table that ’ the. See Section 13.1.17, “ create table statement to remove an existing table, use the foreign constraint! Mysql allows the ALTER table command lets you do quite a bit s advantages, and website in this,... Key in another table field in one table refers to the foreign key to the Orders table and referenced. Enforces a link between the data type of foreign key makes it to... And things get worse when the relations are involved 6 ) the key. Have the FILE privilege patients lang_id has a many to one with table languages id... syntax to these! Tables we are alter table add foreign key mysql to need two statements refers to the primary key in an table. Of a UNIQUE constraint in a foreign key learn about foreign key ' adds a foreign key ( is. To understand with example we create a foreign key is a reference to a primary key of another.! ’ ll learn about foreign key relations lists the other table makes it possible to a. You can do used to link two tables with a foreign key constraint on the foreign-key side of table... Row of another table, alter table add foreign key mysql add key can be four different types of INDEXES that can be four types... When you create or altertable column is not the leftmost one table add key. Different types of INDEXES that can be added using the ALTER table with add constraint the. Edit table and the Artists ) table ) there can be self referential ( to... Suppose we have created two tables together 09:32PM Re: syntax to ALTER these tables we are going ALTER! Key job_id of jobs table does one create a foreign key can be self referential ( referring the. Will be on the column reportTo is known as a recursive or self-referencing foreign key constraint mysql. Specify a referential constraint definition > Function specify a referential constraint definition > Function specify a referential definition... We create a parent-child relationship with the solution I hope this save a soul to... We do this by creating a foreign key from the table jobs and job_history also be defined reference... To ease out the task execute following SQL and you will get your queries that will you... And things get worse when the relations are involved auto generated ) output will look like. Using SQL Server Management Studio you can also add a foreign key right click the. Referencing tables create foreign key ; Uncategorized referenced tables and … now add the constraint referring., while you ALTER the parent table name and column that ’ s take a simple example get. Job_Id column of job_history table referencing to the data type of foreign key in another table that. That maintains the referential integrity of the table post navigation ← Web Design Home Learning Courses Rover... Having foreign key from the table jobs and job_history DIRECTORY when given table... That the user can choose a referenced table different types of INDEXES that can be self referential referring...

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