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20 lip 2009 · You can do this via the information_schema tables. For example: SELECT tc.table_schema, tc.constraint_name, tc.table_name, kcu.column_name, ccu.table_schema AS foreign_table_schema, ccu.table_name AS foreign_table_name, ccu.column_name AS foreign_column_name FROM information_schema.table_constraints AS tc JOIN information_schema.key_column ...
22 paź 2023 · -- one row with (1,1) CREATE TABLE foo ( a int, b int, PRIMARY KEY (a,b) ); INSERT INTO foo (a,b) VALUES (1,1); -- -- two child tables to reference it -- CREATE TABLE t_full ( a int, b int, FOREIGN KEY (a,b) REFERENCES foo MATCH FULL ); CREATE TABLE t_simple ( a int, b int, FOREIGN KEY (a,b) REFERENCES foo MATCH SIMPLE );
14 paź 2008 · for foreign keys from <table>, or. SELECT CONSTRAINT_NAME, TABLE_NAME, REFERENCED_TABLE_NAME FROM information_schema.REFERENTIAL_CONSTRAINTS WHERE CONSTRAINT_SCHEMA = '<schema>' AND REFERENCED_TABLE_NAME = '<table>'. for foreign keys to <table>. You can also get the UPDATE_RULE and DELETE_RULE if you want them.
The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.
19 sie 2024 · In this article, we’ve explored various methods for listing foreign keys across SQL Server, PostgreSQL, and MySQL. Understanding these methods is essential for maintaining referential integrity and ensuring robust database design.
In this tutorial, you will learn about PostgreSQL foreign key and how to add foreign keys to tables using foreign key constraints.
The FOREIGN KEY constraint 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.
