请问如何生成一个结果 用下面的字段减上面的字段
上面的查询语句
SELECT * FROM View_Fans WHERE years='2015' AND months='10' AND issub=0
下面的查询语句
SELECT * FROM View_Fans WHERE years='2015' AND months='10' AND issub=1
------解决思路----------------------
-- 刚才没写 group by ,现在加上。
-- 大概这个样子。
SELECT years , months , days , sum(case when issub = 1 then counts else -counts end)
FROM View_Fans
WHERE years='2015' AND months='10'
group by years , months , days
------解决思路----------------------
SELECT years , months , days ,
sum(case issub when 1 then counts else -counts end) as counts
FROM View_Fans
WHERE years='2015' AND months='10' and issub in (0, 1)
group by years , months , days