sql语句 IF NOT EXISTS ( SELECT * FROM dbo.syscolumns WHERE id = OBJECT_ID('[dbo].[TActScoreReceiveRec]') AND OBJECTPROPERTY(id, N'IsUserTable') = 1 AND name = 'SettleFlag' AND xtype = '167' ) ALTER TABLE [dbo].[TActScoreReceiveRec] ADD SettleFlag VARCH…

判断字段是否存在: DROP PROCEDURE IF EXISTS schema_change; DELIMITER // CREATE PROCEDURE schema_change() BEGIN DECLARE CurrentDatabase VARCHAR(); SELECT DATABASE() INTO CurrentDatabase; IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schem…

判断字段是否存在: DROP PROCEDURE IF EXISTS schema_change; DELIMITER // CREATE PROCEDURE schema_change() BEGIN DECLARE CurrentDatabase VARCHAR(); SELECT DATABASE() INTO CurrentDatabase; IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schem…

判断字段是否存在: DROP PROCEDURE IF EXISTS schema_change; DELIMITER // CREATE PROCEDURE schema_change() BEGIN ); SELECT DATABASE() INTO CurrentDatabase; IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schema=CurrentDatabase AND table_name…

删除数据库表中的字段时,使用了 :alter table 表名 drop column 列名 服务器返回的错误为:Server: Msg 5074, Level 16, State 1, Line 1The object 约束名 is dependent on column 列名.Server: Msg 4922, Level 16, State 1, Line 1ALTER TABLE DROP COLUMN 列名 failed because one or more objects acce…

-- ---------------------------- -- 判断 vrv_paw_rule 表是否存在 thresholdMin 字段,不存在则添加; 存在则修改字段类型 DELIMITER ?? DROP PROCEDURE IF EXISTS schema_change?? CREATE PROCEDURE schema_change() BEGIN IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE tabl…

判断字段是否存在: DROP PROCEDURE IF EXISTS schema_change; DELIMITER // CREATE PROCEDURE schema_change() BEGIN ); SELECT DATABASE() INTO CurrentDatabase; IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schema=CurrentDatabase AND table_name…

if exists(SELECT  1             FROM    sys.tables t                     INNER JOIN sys.columns c ON t.object_id = c.object_id                     INNER JOIN sys.default_constraints dc ON c.default_object_id = dc.object_id             WHERE   t.name …

本文是针对MySql数据库创建的SQL脚本,别搞错咯. 判断表是否存在,不存在就可新增 CREATE TABLE IF NOT EXISTS `mem_cardtype_resource` ( ... ) ENGINE DEFAULT CHARSET=utf8; 判断表字段是否存在,不存在就可新增.修改.删除,移除修改列名 MySql中没有直接的语法可以在增加列前进行判断该列是否存在,解决方案是写一个存储过程来完成此任务. 参考:https://blog.csdn.net/huangjin050…

1.判断索引是否存在 ps:@tableName 表名称, @indexName 索引名 IF EXISTS (SELECT 1 FROM sys.indexes WHERE object_id=OBJECT_ID(@tableName, N'U') and NAME=@indexName) BEGIN DROP INDEX @indexName ON @tableName END 2.判断表名称是否存在 ①:判断临时表是否存在 IF OBJECT_ID(N'tempdb..#temp', N'…