CREATE TABLE doc_exe ( column_a INT CONSTRAINT column_a_un UNIQUE)
GO
ALTER TABLE doc_exe ADD
/* Add a column referencing another column in the same table. */
column_c INT NULL
CONSTRAINT column_c_fk
REFERENCES doc_exe(column_a)
GO
ALTER TABLE doc_exe ADD
/* Add a column referencing another column in the same table. */
column_c INT NULL
CONSTRAINT column_c_fk
REFERENCES doc_exe(column_a)
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货