
下面两条SQL语句如何合并为一条语句 语句一:SELECT a_account ,COUNT(a_account)
下面两条SQL语句如何合并为一条语句语句一:SELECTa_account,COUNT(a_account)ASqdzsFROMa_attendanceWHEREa_da...
下面两条SQL语句如何合并为一条语句
语句一:SELECT a_account ,COUNT(a_account) AS qdzs
FROM a_attendance WHERE a_date >= '2016-12-01' AND a_date <= '2016-12-31' GROUP BY a_account
语句二:SELECT a.p_account AS account,a.p_name AS name ,a.p_dept AS dept,a.p_post AS post,
sum(case when b.l_type='yh' and b.l_year = '2016' and b.l_month = '12' then l_day else '' end) yh,
sum(case when b.l_type='ah and b.l_year = '2016' and b.l_month = '12' then l_day else '' end) ah
from a_p a left join a_l b on a.p_account=b.l_account
group by a.p_name,a.p_dept,a.p_post,a.p_account
两个语句中a_account 和 p_account 是一样的,请高手指点 展开
语句一:SELECT a_account ,COUNT(a_account) AS qdzs
FROM a_attendance WHERE a_date >= '2016-12-01' AND a_date <= '2016-12-31' GROUP BY a_account
语句二:SELECT a.p_account AS account,a.p_name AS name ,a.p_dept AS dept,a.p_post AS post,
sum(case when b.l_type='yh' and b.l_year = '2016' and b.l_month = '12' then l_day else '' end) yh,
sum(case when b.l_type='ah and b.l_year = '2016' and b.l_month = '12' then l_day else '' end) ah
from a_p a left join a_l b on a.p_account=b.l_account
group by a.p_name,a.p_dept,a.p_post,a.p_account
两个语句中a_account 和 p_account 是一样的,请高手指点 展开
2个回答
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照理说,语句二中有了表关联、分组统计,说明你是大致懂的。
那再将语句一关联起来就行了。可能是你没有想到“子查询”吧。
下面的代码逻辑是清晰的,应该比较好懂
SELECT P.*
,D1.yh, D2. ah
,D2.adzs
FROM a_p P
LEFT JOIN (原先的语句2中,分组统计部分
SELECT l_account AS Account
,SUM(...) AS yh
,SUM(...) AS ah
FROM a_l L
GROUP BY l_account
) D1 ON D1.Account = P.p_account
LEFT JOIN (--原先的语句1
SELECT a_account AS Account
,COUNT(*) AS qdzs
FROM a_attendance
WHERE Year(a_date) = 2016
GROUP BY l_account
) D2 ON D1.Account = P.p_account
另外,你的代码中有些缺陷:
1、CASE WHEN ... ELSE '' END有问题,空格的值能够SUM()起来?
2、时间段的写法可能存在窟窿。改成如下:
WHERE a_date >= '2016-12-01' AND a_date < '2017-01-01'
能看出问题所在吗?
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