Postgresql:选择具有不同条件的总和
我有两张桌子: 一、表1如下:Postgresql:选择具有不同条件的总和,postgresql,Postgresql,我有两张桌子: 一、表1如下: ------------------------------------------ codeid | pos | neg | category ----------------------------------------- 1 | 10 | 3 | begin2016 1 | 3 | 5 | justhere 3 | 7 | 7 | justthere 4 |
------------------------------------------
codeid | pos | neg | category
-----------------------------------------
1 | 10 | 3 | begin2016
1 | 3 | 5 | justhere
3 | 7 | 7 | justthere
4 | 1 | 1 | else
4 | 12 | 0 | begin2015
4 | 5 | 12 | begin2013
1 | 2 | 50 | now
2 | 5 | 33 | now
5 | 33 | 0 | Begin2011
5 | 11 | 7 | begin2000
------------------------------------------
codeid | codedesc | codegroupid
-----------------------------------------
1 | road runner | 1
2 | bike warrior | 2
3 | lazy driver | 4
4 | clever runner | 1
5 | worker | 3
6 | smarty | 1
7 | sweety | 3
8 | sweeper | 1
------------------------------------------
codeid | codedesc | sumpos | sumneg
-----------------------------------------
1 | roadrunner | 5 | 55 => (sumpos = 3+2, because 10 have category like 'begin%' so doesn't sum)
2 | bike warrior | 5 | 33
4 | clever runner | 1 | 1
5 | worker | 0 | 0 => (sumpos=sumneg=0) becase codeid 5 category ilike 'begin%'
二,。表2如下所示:
------------------------------------------
codeid | pos | neg | category
-----------------------------------------
1 | 10 | 3 | begin2016
1 | 3 | 5 | justhere
3 | 7 | 7 | justthere
4 | 1 | 1 | else
4 | 12 | 0 | begin2015
4 | 5 | 12 | begin2013
1 | 2 | 50 | now
2 | 5 | 33 | now
5 | 33 | 0 | Begin2011
5 | 11 | 7 | begin2000
------------------------------------------
codeid | codedesc | codegroupid
-----------------------------------------
1 | road runner | 1
2 | bike warrior | 2
3 | lazy driver | 4
4 | clever runner | 1
5 | worker | 3
6 | smarty | 1
7 | sweety | 3
8 | sweeper | 1
------------------------------------------
codeid | codedesc | sumpos | sumneg
-----------------------------------------
1 | roadrunner | 5 | 55 => (sumpos = 3+2, because 10 have category like 'begin%' so doesn't sum)
2 | bike warrior | 5 | 33
4 | clever runner | 1 | 1
5 | worker | 0 | 0 => (sumpos=sumneg=0) becase codeid 5 category ilike 'begin%'
我希望有一个这样的结果,有两个(或更多)条件:
------------------------------------------
codeid | pos | neg | category
-----------------------------------------
1 | 10 | 3 | begin2016
1 | 3 | 5 | justhere
3 | 7 | 7 | justthere
4 | 1 | 1 | else
4 | 12 | 0 | begin2015
4 | 5 | 12 | begin2013
1 | 2 | 50 | now
2 | 5 | 33 | now
5 | 33 | 0 | Begin2011
5 | 11 | 7 | begin2000
------------------------------------------
codeid | codedesc | codegroupid
-----------------------------------------
1 | road runner | 1
2 | bike warrior | 2
3 | lazy driver | 4
4 | clever runner | 1
5 | worker | 3
6 | smarty | 1
7 | sweety | 3
8 | sweeper | 1
------------------------------------------
codeid | codedesc | sumpos | sumneg
-----------------------------------------
1 | roadrunner | 5 | 55 => (sumpos = 3+2, because 10 have category like 'begin%' so doesn't sum)
2 | bike warrior | 5 | 33
4 | clever runner | 1 | 1
5 | worker | 0 | 0 => (sumpos=sumneg=0) becase codeid 5 category ilike 'begin%'
按codeid、codedesc分组Sumpos是sum(pos),其中类别不象“begin%”,但如果类别ILKIE“begin%”使所有pos值变为零(0)
Sumpos是sum(neg),其中类别不象“begin%”,但如果类别ILKIE“begin%”使所有的neg值变为零 有什么办法吗 试试看:
SELECT
b.codeid,
b.codedesc,
sum(CASE WHEN category LIKE 'begin%' THEN 0 ELSE a.pos END) AS sumpos,
sum(CASE WHEN category LIKE 'begin%' THEN 0 ELSE a.neg END) AS sumneg
FROM
table1 AS a
JOIN
table2 AS b ON a.codeid = b.codeid
WHERE b.codegroupid IN (1, 2, 3)
GROUP BY
b.codeid,
b.codedesc;
结果是否应该包含所有代码ID(1-8)的记录?我想也许您只需要codegroupid=1或2的记录,但您的结果是显示worker(codegroupid=3)。不清楚您的结果集是否只是显示子集。很抱歉,我已将coudegroupid编辑为1、2或3。非常感谢。