Table variables are a superior alternative to using temporary tables in many situations. The ability to use a table variable as the return value of a UDF is one of the best uses of table vari-ables. In the following sample, we will address a common need: a function to parse a delimited...
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...
CREATE TABLE postgres=# insert into t5 values(1,'tdsql_pg1'); INSERT01 postgres=# insert into t5 values(2,'tdsql_pg2'); INSERT01 postgres=# create or replace procedure p_bulk_collect() AS $$ declare TYPE t5list IS TABLE OF t5.f2%TYPE; ...
DECLARE @LocationTVP AS LocationTableType; /* Add data to the table variable. */ INSERT INTO @LocationTVP (LocationName, CostRate) SELECT [Name], 0.00 FROM [AdventureWorks].[Person].[StateProvince]; /* 把表变量的数据传递给存储过程 */ EXEC usp_InsertProductionLocation @LocationTVP; GO...
在sqlcmd提示符下,如果没有将任何变量设置为$(tablename),则以下语句将返回该行,并且还会返回消息:“未定义‘tablename’脚本变量”。默认情况下未设置 sqlcmd标志-b。 如果已设置-b,则 sqlcmd 将在“变量未定义”错误后终止。 控制台 sqlcmd1>SELECT Col1 FROM dbo.VariableTest WHERE Col1 ='$(t...
DECLARE @DimCustomer_test TABLE ( [CustomerKey] [int] , [FirstName] [nvarchar](50) ,[MiddleName] [nvarchar](50) ,[LastName] [nvarchar](50) ) —insert data to @DimCustomer_test INSERT @DimCustomer_test ( [CustomerKey] , [FirstName] ...
CREATE TYPE my_type AS TABLE ...;,然后 DECLARE @mytablevariable my_type;。 B. 场景:替换全局 tempdb ##table 将全局临时表替换为内存优化的 SCHEMA_ONLY 表非常简单。 最大的改变是在部署时(而不是运行时)创建该表。 由于采用了编译时优化,创建内存优化表会比创建传统...
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 or...
...n ] ) ] | user_defined_function [ [ AS ] table_alias ] | OPENXML <openxml_clause> | derived_table [ [ AS ] table_alias ] [ ( column_alias [ , ...n ] ) ] | <joined_table> | <pivoted_table> | <unpivoted_table> | @variable [ [ AS ] table_alias ] | @variable....
CREATEPROCEDUREInsertSales @PrmOrderIDINT, @PrmCustomerIDINT, @PrmOrderDate DATETIME, @PrmDeliveryDate DATETIMEASDECLARE@InsertStringASNVARCHAR(500);DECLARE@OrderMonthASINT;-- Build the INSERT statement.SET@InsertString ='INSERT INTO '+/* Build the name of the table. */SUBSTRING(DATENAME(mm, @...