SQLのGROUTP by
397 ワード
GROUP BY , GROUP BY ,
GROUP BY ITEM.ITEMNUM , , ,
A B
1 abc
1 bcd
1 asdfg
select A,B from table group by A
,
A B
abc
1 bcd
asdfg
3 , ,
select A,count(B) from table group by A
A
1 3
group by , select , , group by