sql--COMPUTE作用，實現分批求平均

在sql server 的pubs中可以看到效果
execute reptq2
execute reptq3 1,200,a
下面的pubs中的存儲過程
SET ANSI_NULLS ON
GO


ALTER  PROCEDURE reptq2 AS
select type, pub_id, titles.title_id, au_ord,
   Name = substring (au_lname, 1,15), ytd_sales
from titles, authors, titleauthor
where titles.title_id = titleauthor.title_id AND authors.au_id = titleauthor.au_id
   AND pub_id is NOT NULL
order by pub_id, type
COMPUTE avg(ytd_sales) BY pub_id, type
COMPUTE avg(ytd_sales) BY pub_id


GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO


ALTER  PROCEDURE reptq3 @lolimit money, @hilimit money,
@type char(12)
AS
select pub_id, type, title_id, price
from titles
where price >@lolimit AND price <@hilimit AND type = @type OR type LIKE '%cook%'
order by pub_id, type
COMPUTE count(title_id) BY pub_id, type


GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO