Sql Server有主外鍵關系時添加、刪除數據

當表之間有主外鍵關系時刪除數據會被約束，添加、刪除失敗

解決辦法，我們可以先把主外鍵關系的檢查約束給關掉 → 然后刪除數據 → 之后再把約束打開

查詢出關掉所有外鍵約束的語句

SELECT 
'ALTER TABLE ' + O.NAME + ' NOCHECK CONSTRAINT [' + F.NAME + '];' AS COMMAND 
FROM 
SYS.FOREIGN_KEYS F INNER JOIN SYS.ALL_OBJECTS O ON F.PARENT_OBJECT_ID = O.OBJECT_ID 
WHERE O.TYPE = 'U' AND F.TYPE = 'F';

查詢出開啟所有外鍵約束的語句，與上面的區別是將 NOCHECK 改為 CHECK

SELECT 
'ALTER TABLE ' + O.NAME + ' CHECK CONSTRAINT [' + F.NAME + '];' AS COMMAND 
FROM 
SYS.FOREIGN_KEYS F INNER JOIN SYS.ALL_OBJECTS O ON F.PARENT_OBJECT_ID = O.OBJECT_ID 
WHERE O.TYPE = 'U' AND F.TYPE = 'F';