我有以下查询获得一些我希望按属性'state'分组的结果。 我尝试了不同的子查询,但它们没有工作,我有点被阻止。 SQL是:
SELECT state, id_candidate_basic, MAX( DATE ) FROM `candidate_state`
WHERE `date` <= '2013-09-06 00:00:00' GROUP BY id_candidate_basic
ORDER BY `candidate_state`.`id_candidate_basic` DESC
目前返回:
我会得到每个州的计数(*)。例:
F,14
我,10
O,9
答案 0 :(得分:0)
SELECT state,
id_candidate_basic,
MAX( DATE ),
COALESCE(totalCount, 0) totalCount
FROM `candidate_state`
LEFT JOIN
(
SELECT state, COUNT(*) totalCount
FROM candidate_state
WHERE `date` <= '2013-09-06 00:00:00'
GROUP BY state
) ON candidate_state.state = b.state
WHERE `date` <= '2013-09-06 00:00:00'
GROUP BY id_candidate_basic
ORDER BY `candidate_state`.`id_candidate_basic` DESC