既然你在这两个查询mr.id
分组,我假设你想要的结果是这样的:
mr.id | labor_cnt | mtrial_cnt
--------------------------------
1 | 5 | 3
2 | null | 6
3 | 4 | 2
4 | 3 | null
...
如果这就是你要找的内容,那么你就可以结合使用公用表表达式查询。喜欢的东西:
WITH labor as (
SELECT mr.id AS mrid, count(ml.id) AS labor_cnt
FROM mreq mr JOIN mlbr ml ON mr.id = ml.mrid
WHERE mr.id IN (1235, 3355)
GROUP BY mr.id),
mtrial as (
SELECT mr.id AS mrid, count(mm.id) AS mtrial_cnt
FROM mreq mr JOIN mmrm mm ON mr.id = mm.mrid
WHERE mr.id in (1235, 3355)
GROUP BY mr.id)
SELECT COALESCE(l.mrid, m.mrid), l.labor_cnt, m.labor_cnt
FROM labor l FULL OUTER JOIN mtrial m ON mrid
ORDER BY mrid;
编辑补充
它看起来像你使用MySQL,以及MySQL不支持公共表表达式。 MySQL支持子查询,所以这可能会起作用(注意:我没有验证语法,因为我没有可用的MySQL实例):
SELECT COALESCE(l.mrid, m.mrid), l.labor_cnt, m.labor_cnt
FROM
(SELECT mr.id AS mrid, count(ml.id) AS labor_cnt
FROM mreq mr JOIN mlbr ml ON mr.id = ml.mrid
WHERE mr.id IN (1235, 3355)
GROUP BY mr.id) AS labor
FULL OUTER JOIN
(SELECT mr.id AS mrid, count(mm.id) AS mtrial_cnt
FROM mreq mr JOIN mmrm mm ON mr.id = mm.mrid
WHERE mr.id in (1235, 3355)
GROUP BY mr.id) AS mtrial
ON mrid
ORDER BY mrid;
你叫什么结合?..结果如何查找这两个查询? –