Mar 10, 2023
Foreign Key . . . . for more information http://bit.ly/3SRCeGD check the above link.
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Foreign Key . . . . for more information http://bit.ly/3SRCeGD check the above link.
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Composite Key . . . . for more information http://bit.ly/3SRCeGD check the above link.
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SQL FOREIGN KEY Constraint
SQL FOREIGN KEYÂ Constraint
A FOREIGN KEY is a key used to link two tables together.
A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.
The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.
Look at the following two tables:
“Persons” table:
PersonID LastName FirstName Ag…
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Primary Key & Foreign Key - How to differ each other In SQL Server Foreign key as same as Primary key both are Unique. Both are identified uniquely in each table but their characteristics are different. For more Info click here. More info
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En MySQL, mediante INFORMATION_SCHEMA podemos listar las tablas que tienen foreign keys hacia la tabla que nos interesa Para ello deberemos hacer la siguiente query a la tabla KEY_COLUMN_USAGE: SELECT table_name,column_name,constraint_name, referenced_table_name,referenced_column_name FROM inform
En MySQL, mediante INFORMATION_SCHEMA podemos listar las tablas que tienen foreign keys hacia la tabla que nos interesa Para ello deberemos hacer la siguiente query a la tabla KEY_COLUMN_USAGE: SELECT table_name,column_name,constraint_name, referenced_table_name,referenced_column_name FROM inform
En MySQL, mediante INFORMATION_SCHEMA podemos listar las tablas que tienen foreign keys hacia la tabla que nos interesa Para ello deberemos hacer la siguiente query a la tabla KEY_COLUMN_USAGE: SELECT table_name,column_name,constraint_name, referenced_table_name,referenced_column_name FROM inform via Pocket