zoukankan      html  css  js  c++  java
  • sql 修改字段默认值

    1、查出该字段的约束名称

    SELECT c.name FROM sysconstraints a 
    INNER JOIN syscolumns b on a.colid=b.colid 
    INNER JOIN sysobjects c on a.constid=c.id 
    WHERE a.id=object_id('TClass') 
    AND b.name='PhoneIsOpen' 

    2、删除该约束

    ALTER TABLE TClass DROP CONSTRAINT DF__TClass__PhoneIsO__51BA1E3A

    3、修改默认值约束

    ALTER TABLE TClass ADD CONSTRAINT DF__TClass__PhoneIsO__51BA1E3A DEFAULT(1) FOR PhoneIsOpen

    4、获取表列的默认值

    SELECT SO.NAME AS "Table Name", SC.NAME AS "Column Name", SM.TEXT AS "Default Value"
    FROM dbo.sysobjects SO INNER JOIN dbo.syscolumns SC ON SO.id = SC.id
    LEFT JOIN dbo.syscomments SM ON SC.cdefault = SM.id
    WHERE SO.xtype = 'U' and so.name='TClass'
    ORDER BY SO.[name], SC.colid

  • 相关阅读:
    Elasticsearch
    Docker
    Python 目录
    淘宝
    MyBatis
    Docker 安装ubuntu服务器
    goodrain云平台 mysql主从同步应用创建
    flask入门
    virtualenv
    进程 线程(二)
  • 原文地址:https://www.cnblogs.com/zhyue93/p/sql_default.html
Copyright © 2011-2022 走看看