8 判断列是否存在 if exists(select * from syscolumns where id=object_id('表名') and name='列名') alter table 表名 drop column 列名 9 判断列是否自增列 if columnproperty(object_id('table'),'col','IsIdentity')=1 print '自增列' else print '不是自增列' SELECT * FROM sys.columns WHER...
if exists (select * from sysobjects where id = object_id(N’[存储过程名]’) and OBJECTPROPERTY(id, N’IsProcedure’) = 1) drop procedure [存储过程名] 4 判断临时表是否存在 if object_id(’tempdb..#临时表名’) is not null drop table #临时表名 5 判断视图是否存在 --SQL Server 2000 ...
ifexists(select*fromsyscolumnswhereid=object_id('表名')andname='列名')altertable表名dropcolumn列名 1. 2. 9 判断列是否自增列 ifcolumnproperty(object_id('table'),'col','IsIdentity')=1print'自增列'elseprint'不是自增列'SELECT*FROMsys.columnsWHEREobject_id=OBJECT_ID('表名')ANDis_identity=...
if exists(select * from syscolumns where id=object_id('表名') and name='列名') alter table 表名 drop column 列名 9 判断列是否自增列 if columnproperty(object_id('table'),'col','IsIdentity')=1 print '自增列' else print '不是自增列' SELECT * FROM sys.columns WHERE object_id=OBJECT...
--SQL Server 2005 IF EXISTS (SELECT * FROM sys.views WHERE object_id = ’[dbo].[视图名]’ 6 判断函数是否存在 Sql代码 -- 判断要创建的函数名是否存在 if exists (select * from dbo.sysobjects where id = object_id(N’[dbo].[函数名]’) and xtype in (N’FN’, N’IF’, N’TF’...
DECLARE@TableNameNVARCHAR(256)='YourTableName';-- 替换为实际的表名DECLARE@ColumnNameNVARCHAR(256)='YourColumnName';-- 替换为实际的字段名IFEXISTS(SELECT*FROMINFORMATION_SCHEMA.COLUMNSWHERETABLE_NAME=@TableNameANDCOLUMN_NAME=@ColumnName)BEGINPRINT'字段存在。';ENDELSEBEGINPRINT'字段不存在。';END ...
9、如图5所示,所以,我继续对上面的脚本进行修改,你只要设置自己的参数就可以实现行转列了,效果如图4所示:2.方组列3.行转列宇段4.宇段值5:参数化动态PIVOT行转列Author:听风吹雨Createdate:DECLAREsql_strNVARCHAR(MAX)DECLAREsql_colNVARCHAR(MAX)DECLAREtableNameSYSNAME行转列表DECLAREgroupColumnSYSNAME分组字段DE...
RECONFIGURE表示SQL Server不用重新启动就立即生效 。 使用sp_configure更改设置时,请使用RECONFIGURE语句使更改立即生效,否则更改将在SQL Server重新启动后生效。RECONFIGURE后面加WITH OVERRIDE表示不管这个值是不是符合要求都会生效,比如recovery interval的范围值是10--60对应sys.configurations.minimum是10、sys.configurations...
要检查SQL Server表中是否存在列,您可以使用以下方法之一: 使用INFORMATION_SCHEMA.COLUMNS系统视图: SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'YourTableName' AND COLUMN_NAME = 'YourColumnName'; 将YourTableName替换为您要检查的表名,将YourColumnName替换为您要检查的列名。如果...
IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[DF_Employees_EmpID]') AND type = 'D') BEGIN ALTER TABLE [dbo].[Employees] DROP CONSTRAINT [DF_Employees_EmpID], COLUMN [EmpID] END GO In SQL Server 2016 they have introduced the IF EXISTS clause which removes ...