2023-02-20から1日間の記事一覧
MySQL (8.0.32) drop table tab1;create table tab1(col1 int);insert into tab1 values(1);insert into tab1 values(1);insert into tab1 values(2);insert into tab1 values(2); select * from tab1;select col1,count(*) from tab1 group by 1;select cou…