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...
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 exists (select * from sysobjects where id = object_id(N'[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [表名] 3 判断存储过程是...
我们可以利用IF EXISTS来决定该字段是否存在。 IFEXISTS(SELECTCOLUMN_NAMEFROMINFORMATION_SCHEMA.COLUMNSWHERETABLE_NAME='your_table_name'ANDCOLUMN_NAME='your_column_name')BEGINPRINT'字段存在';-- 如果查询有结果,则打印字段存在ENDELSEBEGINPRINT'字段不存在';-- 如果查询没有结果,则打印字段不存在END 1. 2...
drop database [数据库名] 2 判断表是否存在 if exists (select * from sysobjects where id = object_id(N'[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [表名] 3 判断存储过程是否存在 if exists (select * from sysobjects where id = object_id(N'[存储过程名]') and ...
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)
要检查SQL Server表中是否存在列,可以使用以下查询语句: ```sql IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.COLUMN...
I need a SQL query that compares two values and returns an ID. I have this table: ID Calling_ID Called_ID127102152038090490885603068840715608304092795104030 How do I check if each value in theCalling_IDcolumn exists in theCalled_IDcolumn and then return the ID? The above data would return 88,...
简介:原文:sql server 判断是否存在数据库,表,列,视图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 exists (se... 原文:sql server 判断是否存在数据库,表,列,视图 ...
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]’ ...
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' ...