sql 提高执行效率,加快执行速度,4万多条!求指点!!!
程序介绍:两张表a,b合成一张表ae.
a表两列(OrderID(编号),jgz(甲骨字))6155行。
b表两列(OrderID(编号),yw(一段甲骨字))45515行,yw(一段甲骨字)里的有a表中的甲骨字构成。
ae表三列(记录编号(一段甲骨字的编号),编号(甲骨字编号),次数 (一段甲骨字中每个甲骨字出现的次数))
目的:提高算法执行效率。45515条记录,我执行的半个多小时。谢谢!!!
create table ae
( 记录编号 int,
编号 int not null,
次数 int
)
declare @i1 int,@c1 nvarchar(MAX), @i int,@c nvarchar(1),@c3 int
set @i1=1
while @i1<45515
begin
set @c1=
(select yw from b where OrderID=@i1)
select @i=1
while @i <=len(@c1)
begin
select @c=substring(@c1,@i,1),@i=@i+1
set @c3=
(select OrderID from a where jgz=@c)
update ac set 次数=次数+1 where 编号=@c3 and 记录编号=@i1
if @@rowcount=0
insert into ac (记录编号,编号,次数) values(@i1,@c3,1)
end
set @i1=@i1+1
end
------解决方案--------------------
SQL code
select b.orderID as 记录编号,a.orderID as 编号,
len(b.yw)-len(replace(b.yw,a.jgz,'')) as 次数
from a,b
where charindex(a.jgz,b.yw) > 0
------解决方案--------------------
SQL code
select
b.orderid as 记录编号,a.orderid as 编号,len(b.yw)-len(replace(b.yw,a.jgz,'')) as 次数 from
a,b
where
exists(select 1 from b where charindex(a.jgz,b.yw) > 0)
------解决方案--------------------
SQL code
select
b.orderid as 记录编号,a.orderid as 编号,len(b.yw)-len(replace(b.yw,a.jgz,'')) as 次数
from
a
where
exists(select 1 from b where charindex(a.jgz,b.yw) > 0)
------解决方案--------------------
SQL code
select b.orderID as 记录编号,a.orderID as 编号,len(b.yw)-len(replace(b.yw,a.jgz,'')) as 次数
from a,b
where b.yw like '%'+a.jgz+'%'