如何在 SQL Server 中使用 Create 语句创建临时表?

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时间:2020-09-01 05:10:45  来源:igfitidea点击:

How to create temp table using Create statement in SQL Server?

sqlsql-serverstored-procedures

提问by Liam neesan

How to create a temp table similarly to creating a normal table?

如何创建一个类似于创建普通表的临时表?

Example:

例子:

CREATE TABLE table_name 
(
    column1 datatype,
    column2 datatype,
    column3 datatype,
     ....
 );

回答by Zohar Peled

Same thing, Just start the table name with #or ##:

同样的事情,只需以#或开始表名##

CREATE TABLE #TemporaryTable          -- Local temporary table - starts with single #
(
    Col1 int,
    Col2 varchar(10)
    ....
);

CREATE TABLE ##GlobalTemporaryTable   -- Global temporary table - note it starts with ##.
(
    Col1 int,
    Col2 varchar(10)
    ....
);

Temporary table names start with #or ##- The first is a local temporary table and the last is a global temporary table.

临时表名以#or开头##- 第一个是本地临时表,最后一个是全局临时表。

Hereis one of many articles describing the differences between them.

是描述它们之间差异的许多文章之一。

回答by Mark Kremers

A temporary table can have 3 kinds, the #is the most used. This is a temp table that only exists in the current session. An equivalent of this is @, a declared table variable. This has a little less "functions" (like indexes etc) and is also only used for the current session. The ##is one that is the same as the #, however, the scope is wider, so you can use it within the same session, within other stored procedures.

一个临时表可以有3种,#最常用的。这是一个仅存在于当前会话中的临时表。与 this 等效的是@,声明的表变量。这具有较少的“功能”(如索引等),并且也仅用于当前会话。的##是一个是一样的#,但是,范围更广,因此您可以在同一会话中使用它,其他的存储过程中。

You can create a temp table in various ways:

您可以通过多种方式创建临时表:

declare @table table (id int)
create table #table (id int)
create table ##table (id int)
select * into #table from xyz