新版本(SQL Server 2016): DROP TABLE IF EXISTS PERSON DROP IF EXISTS的语法如下: DROPobject_typeIFEXISTSobject_name 能够用于DROP的object_type,如Tables, Database, Function, Trigger, Stored Procedure, Column, User, Type, View, Schema,皆可套用,比如: ALTER TABLE PERSON DROP COLUMN If EXISTS NAME
EN我已经研究了在SQL Server 2016中删除数据库项时如何测试表或约束的存在，并了解到可以使用'if exist...
DROPobject_typeIFEXISTSobject_name 能够用于DROP的object_type，如Tables, Database, Function, Trigger, Stored Procedure, Column, User, Type, View, Schema，皆可套用,比如：ALTER TABLE PERSONDROP COLUMN If EXISTS NAME SQL Server 2016新特性：DROP IF EXISTS 标签：basesysges.netschfunctionname...
ALTER TABLE DROP COLUMN IF EXISTS ALTER TABLE DROP CONSTRAINT IF EXISTSDocumentation is already published on MSDN:DROP TABLE (Transact-SQL),DROP PROCEDURE (Transact-SQL), DROP TRIGGER (Transact-SQL), ALTER TABLE (Transact-SQL), etc.English (United States) Your Privacy Choices The...
在SQL Server中,可以使用CREATE TABLE语句创建表。CREATE TABLE语句的基本语法如下所示: CREATETABLEtable_name(column1 data_type,column2 data_type,...) 1. 2. 3. 4. 5. 6. 其中,table_name是要创建的表的名称,column1、column2等是表中的列名,data_type是列的数据类型。
I don't like these, and if you also don't like them, then you might try new DROP IF EXISTS (a.k.a. DIE :) ) statements in SQL Server 2016.From SQL Server 2016 CTP3 you can use new DIE statements instead of big IF wrappers, e.g.:...
SQLAlterTableDropColumnItem item = new SQLAlterTableDropColumnItem(); if (lexer.token() == Token.IF) { lexer.nextToken(); accept(Token.EXISTS); item.setIfExists(true); } SQLName name = exprParser.name(); name.setParent(item); item.addColumn(name); 5 changes: 5 additions & 0 delet...
Column.DropIfExists MethodReference Feedback DefinitionNamespace: Microsoft.SqlServer.Management.Smo Assembly: Microsoft.SqlServer.Smo.dll Package: Microsoft.SqlServer.SqlManagementObjects v160.2004021.0 Drops the object with IF EXISTS option. If object is invalid for drop function will return without ...
SQL表: tblFeedback。它存储反馈问题的答案。这些问题保存在另一个表中: tblQuestions。我将继续使用ALTER TABLE tblFeedback DROP COLUMN ...但我不能使用WHERE或其他任何内容添加任何条件。如果我可以指定类似'if column_name starts Question_%‘或'if column...
1. DROP SERVER [ IF EXISTS ] server_name 1. MySQL的SQL语句 - 数据定义语句 - DROP 语句(2) 删除名为 server_name 的服务器的定义。mysql.servers 表中对应的行也被删除。该语句需要 SUPER 权限。 删除表的服务器不会影响创建时使用此连接信息的任何 FEDERATED 表。