DropSchemaBehavior DropSchemaStatement DropSchemaStatement 构造函数 属性 DropBehavior IsIfExists 架构 方法 DropSearchPropertyListAction DropSearchPropertyListStatement DropSecurityPolicyStatement DropSensitivityClassificationStatement DropSequenceStatement DropServerAuditSpecificationStatement DropServerAuditStatement D...
如何使用SQL ServerDROP SCHEMA语句从数据库中删除架构。 SQL Server删除架构语句概述 该DROP SCHEMA语句允许您从数据库中删除架构。下面显示了该DROP SCHEMA语句的语法: DROPSCHEMA[IF EXISTS]schema_name; 使用以下语法: 首先,指定要删除的架构的名称。如果架构包含任何对象,则该语句将失败。因此,您必须在删除架构之前...
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...
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 --判断是否存在'MyView52'这个试图 IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME = N'MyView52') PRINT '存在' else PRINT...
IF EXISTS 适用范围:SQL Server(SQL Server 2016 (13.x) 到当前版本)。只有在架构已存在时才对其进行有条件地删除。schema_name 架构在数据库中所使用的名称。注解要删除的架构不能包含任何对象。 如果架构包含对象,则 DROP 语句将失败。可以在 sys.schemas 目录视图中查看有关架构的信息。
IF (EXISTS(SELECT * FROM sysobjects WHERE id=object_id(N'[dbo].[userfunction]') AND (type='FN' OR type='TF'))) DROP FUNCTION userfunction -- 判断视图是否存在,存在则删除 IF (EXISTS(SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME=N'viewname')) ...
syntaxsql Copy -- Syntax for Azure Synapse Analytics and Parallel Data Warehouse DROP SCHEMA schema_name ArgumentsIF EXISTS Applies to: SQL Server ( SQL Server 2016 (13.x) through current version).Conditionally drops the schema only if it already exists....
if (exists (select * from sys.columns where object_id = object_id('student') and name = 'idCard')) alter table student drop column idCard go if (exists (select * from information_schema.columns where table_name = 'student' and column_name = 'tel')) ...
CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name [create_specification] ... create_specification: [DEFAULT] CHARACTER SET [=] charset_name | [DEFAULT] COLLATE [=] collation_name Explanation: This SQL syntax is used to create a new database or schema in a database management system. ...
OBJECT_ID ( '[ database_name . [ schema_name ] . | schema_name . ] object_name' [ ,'object_type' ] )或简化为:OBJECT_ID ( 'object_name' [ ,'object_type' ] ) 参数: object_name :要使用的对象。object_name 的数据类型为 varchar 或 nvarchar。如果 object_name 的数据类型为 varchar...