MYSQL 查詢分組取最新一條數據
select * from ( select * from table_name order by create_time desc limit 100000 ) as tgroup by t.id ...
select * from ( select * from table_name order by create_time desc limit 100000 ) as tgroup by t.id ...
sq分組取第一條數據的一個方法: ...
1.情景展示 有這樣一種需求: 將數據按照機構進行分組,然后取每個機構下只取一條記錄,如何實現? 2.mysql 分組查詢出來某字段,然后和原來的表進行關聯查詢。 方式一:通過內連接來實現 查看代碼 SELECT ...
分組以后查詢最新的一條數據 $sql = "SELECT i.operating_system, i.version_id, i.update_time,i.operating_system, i.version_id, i.version_name, i.sdk_info ...
...
轉自:https://www.cnblogs.com/onesmail/p/5207236.html ...
https://www.cnblogs.com/JentZhang/p/12162170.html 獲取分組后取某字段最大一條記錄 方法一:(效率最高) select * from test as a where typeindex = (select max(b.typeindex ...
SELECT ROW_NUMBER()OVER(PARTITION By GroupId ORDER BY GroupId ) CN, * FROM T_DIM_SENSOR_GROUP ...