我有两个表
表：事务
id . user_id . amount . status
1 - - 100 -- --- 500 - ----- 1
2 - - 100 -- --- 100 - ----- 0
3 - - 110 -- --- 200 - ----- 1
4 - - 100 -- --- 220 - ----- 1
5 - - 117 -- --- 120 - ----- 1
6 - - 122 -- --- 300 - ----- 1
这意味着用户存款，但只有状态= 1有效
表：活动
id . user_id . bid . status . budget . expense . size. priority
1 -- 100 ---- 80 --- 0 ------- 200 ------ 200 --- 5 -- 1
2 -- 109 ---- 75 --- 1 ------- 050 ------ 030 --- 2 -- 2
3 -- 100 ---- 65 --- 1 ------- 700 ------ 065 --- 2 -- 4
4 -- 107 ---- 77 --- 0 ------- 020 ------ 020 --- 2 -- 3
5 -- 90 ----- 87 --- 1 ------- 120 ------ 090 --- 7 -- 7
我需要在下面过滤后的活动ID（使用php和mysql）
条件：
01. campaign.status = 1
02. campaign.size = 2
03. campaign.budget > campaign.expense
04. those user_id has balance (balance = A - B)
A = sum(transaction.amount where transaction.status=1)
B = sum(campaign.expense)
05. order by bid max value
预期输出 campaign.id = 3
for campaign.id 3 : status 1, size 2, budget 700 > expense 65
balance > 0 means for user_id 100 = A(500+220) > B(200+65) //means A-B = 455
我不是那么专家。 尝试了几种方法
请帮忙，解决完我就睡觉。损失了2天。
一种可能的解决方案：
SELECT *
FROM campaign c
WHERE
c.status = 1
AND c.size = 2
AND c.budget > c.expense
AND
( SELECT sum( amount )
FROM transaction t
WHERE t.user_id = c.user_id
)
-
( SELECT sum( expense )
FROM campaign c1
WHERE c.user_id = c1.user_id AND t.status=1
)
> 0
;
另一个：
SELECT c.*
FROM (
SELECT user_id, sum( amount ) amount
FROM transaction t
WHERE EXISTS(
SELECT 1 FROM campaign c
WHERE t.user_id = c.user_id
AND c.status = 1
AND c.size = 2
AND c.budget > c.expense
)
GROUP BY user_id
) q1
JOIN (
SELECT user_id, sum( expense ) expense
FROM campaign c
WHERE EXISTS(
SELECT 1 FROM campaign c1
WHERE c.user_id = c1.user_id
AND c1.status = 1
AND c1.size = 2
AND c1.budget > c.expense
)
GROUP BY user_id
) q2
ON q1.user_id = q2.user_id AND q1.amount - q2.expense > 0
JOIN campaign c
ON c.user_id = q1.user_id
WHERE c.status = 1
AND c.size = 2
AND c.budget > c.expense
演示（两个查询）：http://www.sqlfiddle.com/#!2/414ca5/2
请在您的数据上尝试它们，我不确定哪一个会表现得更好（可能是第一个）。
这两个查询至少需要两个表的user_id列上的索引才能获得更好的性能：
CREATE INDEX camp_user_id ON campaign( user_id );
CREATE INDEX trans_user_id ON transaction( user_id );