部分由我們支持各種客戶運行的腳本的它增加了外鍵,但外鍵,我不希望運行腳本的這一部分時添加的一個,因爲一些客戶在他們的設置中沒有這個。如何從下面的代碼中刪除FK6。我已經嘗試了下面的外鍵FK6上的DROP,但得到語法錯誤。下降外鍵約束,如果不存在
IF OBJECT_ID('FK2') IS NULL
BEGIN
ALTER TABLE [table_1] ADD
CONSTRAINT [FK2] FOREIGN KEY
(
[reason_gen]
) REFERENCES [table_1] (
[field_1]
) NOT FOR REPLICATION,
CONSTRAINT [FK3] FOREIGN KEY
(
[field_2],
[field_3]
) REFERENCES [table_2] (
[field_4],
[field_5]
) NOT FOR REPLICATION,
CONSTRAINT [FK4] FOREIGN KEY
(
[res_code_gen]
) REFERENCES [table_3] (
[field_6]
) NOT FOR REPLICATION,
CONSTRAINT [FK5] FOREIGN KEY
(
[field_7],
[field_8]
) REFERENCES [table_4] (
[field_7],
[field_8]
) NOT FOR REPLICATION,
ALTER TABLE [table_1] DROP
CONSTRAINT [FK6] FOREIGN KEY
(
[field_9]
) REFERENCES [ftable_5] (
[field_10]
) NOT FOR REPLICATION
END
如果你刪除一個關鍵的,你不需要指定整個關鍵。例如'alter table [table_1] drop constraint [fk6]'would would be all you need ... –