如何优化查询??
有一个视图useraa:
SELECT DATEADD([day], SIGN(DATEDIFF(d, dbo.personal1.u_lastlogintime, GETDATE())
/ 28) * 28, dbo.personal1.u_lastlogintime) AS b_lastlogintime,
dbo.personal1.u_web, dbo.personal1.u_regtime, b.fashion
FROM dbo.user_money b RIGHT OUTER JOIN
dbo.personal1 ON b.userid = dbo.personal1.u_name AND b.id =
(SELECT TOP 1 id
FROM dbo.user_money
WHERE (from_date < GETDATE()) AND (to_date > GETDATE()) AND (state = ' ') AND
((manner = '时间 ') OR
((manner = '点击 ') AND (balance > 0))) AND userid = b.userid
然后用查询:
select dbo.useraa.b_lastlogintime, dbo.useraa.u_college,
dbo.useraa.id, dbo.useraa.u_name, dbo.useraa.u_sex,
dbo.useraa.u_vocation1, dbo.useraa.u_vocation2,
dbo.useraa.u_lastlogintime from dbo.useraa LEFT OUTER JOIN
dbo.c_order ON dbo.useraa.fashion = dbo.c_order.set_user AND
dbo.c_order.c_search =0 and dbo.c_order.com_user= '个人 ' ORDER BY dbo.c_order.corder,convert(varchar(10),dbo.useraa. b_lastlogintime,120) DESC,dbo.useraa.u_update DESC
速度很慢,如何优化???
------解决方案----------------------try:
select U.b_lastlogintime, U.u_college, U.id, U.u_name, U.u_sex, U.u_vocation1, U.u_vocation2, U.u_lastlogintime
from dbo.useraa as U LEFT OUTER JOIN
(Select corder from dbo.c_order where com_user= '个人 ' and c_search =0) as C
ON U.fashion = C.set_user
ORDER BY C.corder,convert(varchar(10),U. b_lastlogintime,120) DESC,U.u_update DESC
--try2:
select U.b_lastlogintime, U.u_college, U.id, U.u_name, U.u_sex, U.u_vocation1, U.u_vocation2, U.u_lastlogintime
from dbo.useraa as U LEFT OUTER JOIN
(Select corder from dbo.c_order where com_user= '个人 ' and c_search =0) as C
ON U.fashion = C.set_user
ORDER BY C.corder, U. b_lastlogintime DESC, U.u_update DESC
------解决方案--------------------这么快!!
------解决方案--------------------自悟,呵呵
――――――――――――――――――――――――分页与分次取出
--页码i=2
--页数j=4
declare @c int
set @c = (select count(*) from tablea)
declare @a int
declare @b int
set @a = 1
set @b = @c/4--想分的页数
set @a = @b+1--该页首条
set @b = @b*2--页码--该页未条
declare @sql varc