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...
In this post, I am sharing two options for checking whether a column exists in a SQL Server table or not. When you are preparing the full database change script, you should put DDL statements in the IF EXISTS condition for avoiding any error. ...
IF EXISTS (SELECT * FROM sys.views WHERE object_id = ’[dbo].[视图名]’ --SQL Server 2000 IF EXISTS (SELECT * FROM sysviews WHERE object_id = ’[dbo].[视图名]’ --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 ...
drop function [dbo].[函数名] 7 获取用户创建的对象信息 SELECT [name],[id],crdate FROM sysobjects where xtype='U' 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(...
以SQL Server为例,查询列是否存在,如果不存在,则新增列 IF NOT EXISTS ( SELECT * FROM syscolumns WHERE id = object_id('[dbo].[Table_Name]') AND name = 'Column_Name') ALTER TABLE [dbo].[Table_Name] ADD Column_Name VARCHAR(50)
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 object_id(’tempdb..#临时表名’) is not null drop table #临时表名 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代码 --SQL Server 2000 IF EXISTS (SELECT * FROM sysviews WHERE object_id = ’[dbo].[视图名]’ ...
PRINT 'Table exists!' END ELSE BEGIN PRINT 'Table does not exist.' END 2.删除已存在的记录 如果我们想要插入新的数据,但只想在数据库中没有相同记录的情况下插入,我们可以使用IFEXISTS来检查并删除任何现有的匹配记录。例如: sql IF EXISTS (SELECT * FROM your_table_name WHERE some_column = some_va...
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DECLARErow2columnSYSNAME行变列的字段DECLARErow2columnValueSYSNAME行变列值的字段SETtableName...
-- Create a new table called 'Customers' in schema 'dbo'-- Drop the table if it already existsIFOBJECT_ID('dbo.Customers','U')ISNOTNULLDROPTABLEdbo.CustomersGO-- Create the table in the specified schemaCREATETABLEdbo.Customers ( CustomerIdINTNOTNULLPRIMARYKEY,-- primary key columnName...