一个 sql 不会写...

[chaleaoch]

select id, max(field_d)
from table_name
group by field_a,field_b,field_c;

报错了 id must appear in the GROUP BY clause or be used in an aggregate function

所以 是不是只能用子查询了?

SELECT ID
FROM
table_name
WHERE
( field_a, field_b, field_c, field_d) IN (
SELECT
"field_a",
"field_b",
"field_c",
MAX ( field_d ) AS "field_d"
FROM
"table_name"
GROUP BY
field_a,
"field_b",
"field_c"
ORDER BY
"field_a" DESC
);

谢谢

[chaleaoch]

sorry 忘记用 md 了 排版感人.

[glacer]

id 放 group by 里...

[chaleaoch]

@glacer 你是认真的吗?

[liprais]

看不懂你想要啥

[chaleaoch]

@liprais 我想要根据 a,b,c 三个字段 group by 取 d 的最大值的那条记录的 id.

[glacer]

@chaleaoch 从你这两条 SQL 来看，你根本就不会写 SQL

[chaleaoch]

@glacer 是啊 所以才发帖求助啊.

[liprais]

@chaleaoch
d 没有重复的话可以这样写

select id
from table t0 join
(
select max(d) as d from table group by a,b,c
) t1
on t0.d = t1.d

如果有重复的话，你需要写清楚到底要哪一条