判断字段是否存在，判断主键是否存在，判断某个字段是否具有not null约束

判断字段是否存在：if not exists(select * from syscolumns where id=object_id('temphlxf') and name='czy') beginalter table temphlxf add czy varchar(50) not nullendGO判断主键是否存在：IF EXISTS (select * from sysobjects where parent_obj=object_id(N'temphlxf') and name='pk_temphlxf' and xtype='PK')BEGINALTER TABLE temphlxf drop Constraint pk_temphlxfENDGO判断某个字段是否具有not null约束：if exists (select * from syscolumns where id = OBJECT_ID('temphlxf') and name = 'czy' and isnullable=1)begin alter table temphlxf alter column czy varchar(50) not nullend GO判断字段是否存在：if not exists(select * from syscolumns</p></div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" /> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.9.1/font/bootstrap-icons.min.css" 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