我有两个要结合到单个输出的查询,我不能使用UNIOn,因为它们有不同数量的列。结合使用不同列数的两个查询
该表是ref
与字段id
refid
cellid
cat
它们都含有整数
查询1:查找行的总数目为每个唯一cellid
SELECT cellid, COUNT(*) totalcount, cat FROM rel GROUP BY cellid
查询2:查找模式(最常见的值)cat
每个独特cellid
SELECT cellid, cat
FROM rel t
GROUP BY cellid, cat
HAVING cat = (
SELECT cat
FROM rel
WHERE cellid = t.cellid
GROUP BY cat
ORDER BY COUNT(*) DESC, cat
LIMIT 1
)
举的什么,我试图做我想查询我的桌子
id | refid | cellid | cat
1 | 1 | 1 | 1
2 | 2 | 2 | 2
3 | 3 | 3 | 4
4 | 1 | 1 | 2
5 | 2 | 1 | 2
6 | 3 | 1 | 3
7 | 1 | 2 | 2
8 | 1 | 1 | 2
,并返回
cellid | no_of_rows | Mode_of_cat
1 | 5 | 2
2 | 2 | 2
3 | 1 | 4