Transact-SQL 语法约定 语法 SQL Server 和 Azure SQL 数据库的语法: syntaxsql <SELECT statement>::=[WITH{ [XMLNAMESPACES, ] [<common_table_expression>[ , ...n ] ] } ]<query_expression>[ORDERBY<order_by_expression>] [<FOR Clause>] [OPTION(<query_hint>[ , ...n ] ) ]<query_express...
语法: <SELECTstatement>::=[WITH <common_table_expression> [,...n]]<query_expression>[ORDER BY { order_by_expression | column_position [ ASC | DESC]}[,...n]][<FOR Clause>][OPTION ( <query_hint> [ ,...n]) ]<query_expression>::={<query_specification>|(<query_expression>) }[...
数据操作语言 用于检索和操作数据的 SQL 语句的子集。数据操纵语言是指用来查询、添加、修改和删除数据库中数据的语句。 这些语句包括SELECT、INSERT、UPDATE、DELETE等命令,其中,SELECT是最重要的语句。 数据控制语言。 数据控制语言(Data Control Language ,DCL)是用来设置或更改数据库用户或角色权限的语句。 包括GRANT...
SQL USEAdventureWorks2022; GO-- Declare two variables.DECLARE@FirstNameVariableNVARCHAR(50), @PostalCodeVariableNVARCHAR(15);-- Set their values.SET@FirstNameVariable = N'Amy';SET@PostalCodeVariable = N'BA5 3HX';-- Use them in the WHERE clause of a SELECT statement.SELECTLastName, FirstName...
C. Use DISTINCT with SELECT D. Create tables with SELECT INTO Show 17 more Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric This article provides examples of using theSELECTstatement.
Transact-SQL 语法约定 (Transact-SQL) 教程:编写 Transact-SQL 语句 +(加)(Transact-SQL) +(一元加号)(Transact-SQL) +(字符串串联)(Transact-SQL) +=(加等于)(Transact-SQL) +=(字符串串联)(Transact-SQL) -(负)(Transact-SQL) -(减)(Transact-SQL) -=(减等于)(Transact-SQL) *(乘)(Transact-SQ...
有关详细信息,请参阅 FROM (Transact-SQL) 和SELECT (Transact-SQL)。 函数和多个SELECT语句通过select_statement分隔UNION或UNION ALL可用于。 CHECK OPTION 要求对该视图执行的所有数据修改语句都必须符合 select_statement 中所设置的条件。 通过视图修改行时, WITH CHECK OPTION 请确保在提交修改后通过视图保持可见...
SelectStatement TextImageOn 方法 CreateTriggerStatement CreateTypeStatement CreateTypeTableStatement CreateTypeUddtStatement CreateTypeUdtStatement CreateUserStatement CreateViewStatement CreateWorkloadClassifierStatement CreateWorkloadGroupStatement CreateXmlIndexStatement CreateXmlSchemaCollectionStatement Crea...
SelectStatement TextImageOn 方法 CreateTriggerStatement CreateTypeStatement CreateTypeTableStatement CreateTypeUddtStatement CreateTypeUdtStatement CreateUserStatement CreateViewStatement CreateWorkloadClassifierStatement CreateWorkloadGroupStatement CreateXmlIndexStatement CreateXmlSchemaCollectionStatement C...
@ return_variable can be specified only for Transact-SQL functions and not for CLR functions. select_stmt The single SELECT statement that defines the return value of an inline table-valued function (TVF). ORDER (<order_clause>) Specifies the order in which results are being returned from ...