oracle的with可以有多个查询

oracle的with……as……后可以带多个查询，之间可用逗号分隔

 -- with……AS……带多个查询例

SQL> select * from v$version;

 

 BANNER

 -------------------------------------------------------------------------

 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

 PL/SQL Release 11.2.0.1.0 - Production

 CORE    11.2.0.1.0      Production

 TNS for 64-bit Windows: Version 11.2.0.1.0 - Production

 NLSRTL Version 11.2.0.1.0 - Production

 

 SQL>

SQL> with a as (select * from dual)

   2     ,b as (select * from dual)

   3  select * from a;

 

 D

 -

 X

 

注意环境是oracle11g，在10g及以下版本中，必须用到所有的查询。

 

-- 失败

with a as (select * from dual)

        ,b as (select * from dual)

     select * from a;

 

-- 成功

with a as (select * from dual)

        ,b as (select * from dual)

     select * from a,b;

 

没环境，不试了。

 

 

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