Cách tìm khóa ngoại của 1 bảng trong SQL
Hôm nay Admin chia sẽ cách tìm khóa ngoại của 1 bảng trong SQL. Một số cách sau:
1/ Tìm quay lệnh TSQL
Ví dụ bảng roles
SELECT *
FROM sys.foreign_keys
WHERE referenced_object_id = object_id('roles');
Hoăc chạy thủ tục
EXEC sp_help 'dbo.roles'
2/ Có thể dùng script bên dưới
SELECT OBJECT_NAME(f.object_id) as ForeignKeyConstraintName,
OBJECT_NAME(f.parent_object_id) TableName,
COL_NAME(fk.parent_object_id,fk.parent_column_id) ColumnName,
OBJECT_NAME(fk.referenced_object_id) as ReferencedTableName,
COL_NAME(fk.referenced_object_id,fk.referenced_column_id) as ReferencedColumnName
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fk
ON f.OBJECT_ID = fk.constraint_object_id
INNER JOIN sys.tables t
ON fk.referenced_object_id = t.object_id
WHERE OBJECT_NAME(fk.referenced_object_id) = 'your table name'
and COL_NAME(fk.referenced_object_id,fk.referenced_column_id) = 'your key column name'
Chúc các bạn thành công
Phương Nguyễn
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