MySQL用GROUP BY分组取最新一条数据
SELECTt.*FROMtask_examine tJOIN (SELECTSUBSTRING_INDEX( group_concat( id ORDER BY crt_time DESC ), ‘,’, 1 ) AS idFROMtask_examineGROUP BY task_id ) tmpON t.id = tmp.idORDER BY crt_time desc;
·
SELECT
t.*
FROM
task_examine t
JOIN (
SELECT
SUBSTRING_INDEX( group_concat( id ORDER BY crt_time DESC ), ‘,’, 1 ) AS id
FROM
task_examine
GROUP BY task_id ) tmp
ON t.id = tmp.id ORDER BY crt_time desc;
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