DROP TABLE [IF EXISTS] [db_name.]table_name; 说明:SQL中加[IF EXISTS] ,可以防止因表不存在而导致执行报错。 参数:db_name:Database名称。如果未指定,将选择当前database。table_name:需要删除的Table名称。 3、示例 以下示例演示DROP命令的使用,依次执行如下SQL语句: --删除整个表course DROP TABLE IF EX...
Hi Joe, You are right, MERGE is created to satisfy SQL Standard and to cover all possible matching scenarios. and it has too many options for the simplest cases. Could you please create or vote for this change on MS connect? CREATE OR REPLACE and DROP IF EXISTS are highly ...
ms_sql:drop and create a job /*** Object: Job [syncData_23_00] Script Date: 09/30/2013 16:48:32 ***/Declare@myJobIDvarchar(256)IFEXISTS(SELECTjob_idFROMmsdb.dbo.sysjobs_viewWHEREname=N'syncData_23_00')beginSELECT@myJobID=job_idFROMmsdb.dbo.sysjobs_viewWHEREname=N'syncData_23_...
Option 4 – DROP TABLE IF EXISTS (SQL Server 2016 and up) The previous T-SQL examples will work in all supported versions. However, SQL Server 2016 introduced a simpler way of dropping a table with DROP IF EXISTS. Instead of having to look and see if whether or not the table exists w...
MSSQL扫盲系列(1)-CREATE,ALTER,DROP 2012-03-10 08:23 − 简单的数据定义(CREATE,ALTER,DROP,DECLARE) 表,列,视图,索引,触发器 创建表,并附带各种约束,默认值 View Code CREATE TABLE USERS ( ID INT IDENTITY(1,1) PRIMARY KEY,--自增主键... 方外老和尚 4 1169 [create] [drop]与[alter]...
Array data type in SQL server Array's IN SQL SERVER? ASCII values for extended characters Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or upd...
IF NOT EXISTS (SELECT name FROM sys.filegroups WHERE name = N'NewGroup') BEGIN ALTER DATABASE AdventureWorks2022 ADD FILEGROUP NewGroup; ALTER DATABASE AdventureWorks2022 ADD FILE (NAME = File1, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\DATA\File1.ndf')...
-- attempt to drop column HomePhone using IF EXISTS to see if it exists – SQL Server 2016 and upALTERTABLE[dbo].[Employees]DROPCOLUMNIFEXISTS[HomePhone]GOSELECT*FROM[dbo].[Employees]GO Now, if we run the same statement to drop the column we know is no longer there the statement will...
在SQL Server 2008数据库中,使用DDL语言创建数据表的语法结构比较复杂,本书在多个章节分别进行讲解。(1)使用CREATE TABLE创建数据表的语法结构如下所示。CREATE TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name ( { <column_definition>} [ ] [ ,...n ] ) [ ON { partiti...
if it does not exist.IFNOTEXISTS(SELECTnameFROMsys.filegroupsWHEREname= N'NewGroup')BEGINALTERDATABASEAdventureWorks2022ADDFILEGROUP NewGroup;ALTERDATABASEAdventureWorks2022ADDFILE(NAME= File1, FILENAME ='C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\DATA\File1.ndf')TOFILEGROUP ...