if not exists (select * from sysobjects where id = object_id('table_name') and OBJECTPROPERTY(id, 'IsUserTable') = 1) c,判断列不存在 代码如下: if not exists (select * from syscolumns where id=object_id('table_name') an
ifnotexists(select*fromsys.columnswherename='字段名'and[object_id]=object_id(N'表名'))altertable表名add字段名 nvarchar(255) --判断字段存在则删除 if exists(select*fromsys.columnswherename='字段名'and[object_id]=object_id(N'表名'))altertable表名dropcolumn字段名 原文链接:https://blog.csdn...
1、判断数据库是否存在 if exists (select * from sys.databases where name = '数据库名') drop database [数据库名] 2判断表是否存在 IF NOT EXISTS(SELECT* FROMsysobjects WHEREid =OBJECT_ID('cb_DBDossierTypeSet') ANDtype = 'U' ) 。。。 GO 3判断存储过程是否存在 IF(SELECT OBJECT_ID('Get...
if not exists (SELECT 1 FROM [t_Table] where [fName] = '张三') insert into [t_Table] ([fName]) values ('张三'); sqlite语法: 代码如下: insert into [t_Table] ([fName]) select '张三' where not exists (SELECT 1 FROM [t_Table] where [fName] = '张三'); 更多信息请查看IT技...
IF NOT EXISTS (SELECT * FROM sys.symmetric_keys WHERE name LIKE '%MS_DatabaseMasterKey%') BEGIN CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'MasterKey*'; END GO USE master GO -- create certificate CREATE CERTIFICATE MasterCert_BackupEncrypted ...
我当前的解决方案:我在 PHP 中检查当前数据库类型并切换/大小写查询字符串。它很干净,但一根绳子更不臭;-) 更新: 我改变了 MSSQL 查询:从 IF NOT EXISTS 到 IF EXISTS 以提高效率。UPDATE 将比 INSERT 更频繁地发生,因此在大多数情况下,只会执行第一个(子)查询。
可以用LIKE方法 like方法能一模一样的将一个表的结果复制生成一个新表，包括复制表的备注、索引、主键外键、存储引擎等。CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name { LIKE old_tbl_name | (LIKE old_tbl_name) } 复制表 CREATE TABLE IF NOT EXISTS tb_base_like (LIKE tb_base)...
IF(@@trancount>0) begin raiserror(15002,-1,-1,'sp_password') return(1) end ifnotexists(select*frommaster.dbo.sysloginswhere loginname=@loginameandisntname=0) begin raiserror(15007,-1,-1,@loginame) return(1) end if(@self<>1ANDis_srvrolemember('sysadmin')=0ANDexists (SELECT*FROM...
-- Step 3 - Create SQL Server Service Master Key USE master; GO IF NOT EXISTS( SELECT * FROM sys.symmetric_keys WHERE name = '##MS_ServiceMasterKey##') BEGIN CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'MSSQLSerivceMasterKey' END; GO 创建数据库级别Master Key 在用户数据库TestDb数据库下...
if not exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tablespaceinfo]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) create table tablespaceinfo --创建结果存储表 (nameinfo varchar(50) , rowsinfo int , reserved varchar(20) , datainfo varchar(20) , index_size va...