{ sql_statement | statement_block } 使用语句块定义的任何 Transact-SQL 语句或语句分组。 除非使用了语句块,IF否则或ELSE条件只能影响一个 Transact-SQL 语句的性能。 若要定义语句块,请使用流控制关键字BEGIN和END。 注解 IF...ELSE可以在批处理、存储过程和即席查询中使用构造。 在存储过程中使用此构造时,通...
SQL CREATEPROCEDUREpr_Names @VarPrice moneyASBEGIN-- The print statement returns text to the userPRINT'Products less than '+CAST(@VarPriceASvarchar(10));-- A second statement starts hereSELECTProductName, PriceFROMvw_NamesWHEREPrice < @VarPrice;ENDGO ...
ELSE BEGIN -- Handle unexpected error END IF @@trancount > 0 ROLLBACK END CATCH The XACT_ABORT setting is turned on so that SQL Server will treat any error as a transaction abort error, thus allowing it to be trapped and handled. Within the TRY block any error that occurs within an ...
Accepts visitor C# 复制 public override void Accept(Microsoft.SqlServer.TransactSql.ScriptDom.TSqlFragmentVisitor visitor); Parameters visitor TSqlFragmentVisitor Applies to 产品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 161 本文...
Is any Transact-SQL statement or statement grouping as defined by using a statement block. Unless a statement block is used, the IF or ELSE condition can affect the performance of only one Transact-SQL statement.To define a statement block, use the control-of-flow keywords BEGIN and END.Rema...
Building blocks of a T-SQL statement When writing a T-SQL statement, the following three actions are required: Express the intended operation, such as reading or changing data Provide a target or source list of affected tables Provide a condition that filters the affected records The intended op...
IF@a=@b-2 SELECT 'same' ELSE SELECT 'different' You are certainly right:-) I was neglected implicit conversion. Bonnie.Sterling SSC Journeyman Points: 89 More actions November 18, 2014 at 8:33 am #1759308 Unlike (44) Nice example TY ...
Accepts visitor for Children C# 复制 public override void AcceptChildren(Microsoft.SqlServer.TransactSql.ScriptDom.TSqlFragmentVisitor visitor); Parameters visitor TSqlFragmentVisitor Applies to 产品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 161 本...
If you try to assign values to the name and birthdate columns only in the INSERT INTO T-SQL statement, as in the below statement: 1 2 INSERT INTO InsertDemo (StName ,StBirthDate) VALUES ( 'Swathi','2000-11-04') The statement execution will fail, as you should assign value for ...
TRY…CATCH syntax example BEGIN TRY -- Code that might generate an error INSERT INTO Employees (EmployeeID, Name) VALUES (1, 'John Doe'); END TRY BEGIN CATCH -- Error handling code PRINT 'An error occurred: ' + ERROR_MESSAGE(); END CATCH; In this example, if the INSERT statement wi...