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实例说明
资料表结构(红色为主键)==>
主表:test_part_cost_tab(料号资料表)
part_no varchar2(20)
part_name varchar2(50)
从表:test_part_cost_dt_tab(料号成本资料表)
part_no varchar2(10)
cost_id varchar2(5)
cost number
数据==>
主表资料:
part_no part_name
1 1000 name1000
2 1001 name1001
从表资料:
part_no cost_id cost
1 1000 100 1.1
2 1000 200 1.2
3 1000 300 1.3
4 1000 321 1.321
5 1001 100 2.1
交叉资料==>
sql语句产生的结果
part_no part_name cost_100 cost_200 cost_300 cost_321
1 1000 name1000 1.1 1.2 1.3 1.321
2 1001 name1001 2.1 0 0 0
具体的交叉sql语句写法:
select a.part_no,a.part_name,
–sum(b.cost)
sum(case when b.cost_id = 100 then b.cost else 0 end) as cost_100,
sum(case when b.cost_id = 200 then b.cost else 0 end) as cost_200,
sum(case when b.cost_id = 300 then b.cost else 0 end) as cost_300,
sum(case when b.cost_id = 321 then b.cost else 0 end) as cost_321
from test_part_cost_tab a,test_part_cost_dt_tab b
where a.part_no = b.part_no
group by a.part_no,a.part_name
ps: 若主表有资料,从表没有资料时,交叉后会没有相应的资料
解决办法是在where条件里用外连接
where a.part_no = b.part_no(+)
参考资料:
http://www.cnblogs.com/iouniuniu/archive/2004/04/05/5238.aspx ==>此文的语法与本文的语法不同
http://it.icxo.com/htmlnews/2004/11/11/454293.htm
http://www.itpub.net/176727.html
