Temporary Tables And Table Variables In SQL 基本常识 1. 局部临时表(#开头)只对当前连接有效,当前连接断开时自动删除 2. 全局临时表(##开头)对其它连接也有效,在当前连接和其他访问过它的连接都断开时自动删除 3. 临时表就像普通表一样,它可以做索引等等 4. 临时表存在 tempdb database, 表变量存在 memory...
SQL Server 2012 Service Pack 3SQL Server 2014 Developer - duplicate (do not use)SQL Server 2014 Enterprise - duplicate (do not use)SQL Server 2014 Standard - duplicate (do not use) Symptoms Assume that you create a stored procedure that uses a cursor on a table variable in Microsoft SQL ...
table variables can be used in functions, stored procedures, and batches. To declare variables of type table, use DECLARE @local_variable. Transact-SQL syntax conventions Syntax syntaxsql Copy table_type_definition ::= TABLE ( { <column_definition> | <table_constraint> } [ , ...n ] ) ...
The column is computed from an expression that uses other columns in the same table. For example, a computed column can have the definition: cost AS price * qty. The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one...
Unlike the majority of the other data types in SQL Server, you cannot use a table variable as an input or an output parameter. In fact, a table variable is scoped to the stored procedure, batch, or user-defined function just like any local variable you create with a DECLARE statement. ...
type_name puede ser cualquiera de los siguientes tipos: Un tipo de datos del sistema de SQL Server. Un tipo de datos del alias basado en el tipo de datos del sistema de SQL Server. Los tipos de datos de alias se crean con la instrucción CREATE TYPE antes de que puedan utilizarse ...
Transact-SQL (T-SQL) Reference Date & time hierarchyid methods (database engine) Numeric String & binary Spatial geography & instances (geography Data Type) Spatial geometry & instances (geometry Data Type) Data types XML DBCC Functions
Transact-SQL-Referenz (T-SQL) Datum und Uhrzeit hierarchyid-Methoden (Datenbank-Engine) Numerisch Zeichenfolge und Binär Räumliche Geografie und Instanzen (geografische Datentypen) Räumliche Geometrie und Instanzen (Geometrie-Datentyp) Datentypen XML DBCC Funktionen Sprachelemente Abfragen Aus...
(n|max) ] Variable-length Unicode character data.ncan be a value from 1 through 4000.maxindicates that the maximum storage size is 2^31-1 bytes (2 GB). Storage size in bytes is two times the number of characters entered + 2 bytes. The data entered can be zero characters in length....
(NewName, NewReasonType)ONTarget.Name = Source.NewNameWHENMATCHEDTHENUPDATESETReasonType = Source.NewReasonTypeWHENNOTMATCHEDBYTARGETTHENINSERT(Name, ReasonType)VALUES(NewName, NewReasonType)OUTPUT$actionINTO@SummaryOfChanges;-- Query the results of the table variable.SELECTChange,COUNT(*)ASCountPer...