由于您mr.id
在两个查询中都按分组,我假设您想要类似的结果:
mr.id | labor_cnt | mtrial_cnt
--------------------------------
1 | 5 | 3
2 | null | 6
3 | 4 | 2
4 | 3 | null
...
如果这就是您要查找的内容,那么您可以将查询与公用表表达式结合起来。就像是:
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;
编辑添加
看起来您使用的是 MySQL,而 MySQL 不支持公用表表达式。MySQL 确实支持子查询,所以这可能有效(注意:我没有验证语法,因为我没有可用的正在运行的 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;