比如有一個 profession (職業表),按它的分類,統計每類的數量:
按分類,統計每類的數量:
SELECT p.type, COUNT( * ) from profession p
where p.isDelete = 0
GROUP BY p.type
或
SELECT p.type, COUNT( p.professionId ) from profession p
where p.isDelete = 0
GROUP BY p.type
比如有一個 profession (職業表),按它的分類,統計每類的數量:
按分類,統計每類的數量:
SELECT p.type, COUNT( * ) from profession p
where p.isDelete = 0
GROUP BY p.type
或
SELECT p.type, COUNT( p.professionId ) from profession p
where p.isDelete = 0
GROUP BY p.type