sql查询来计算行数

Question

我有一张这样的表

enter image description here

Answer 1

SELECT
    base.*, aaa.the_count
FROM
    TABLE base
INNER JOIN (
    SELECT
        GROUP,
        count(*) AS the_count
    FROM
        TABLE
    GROUP BY
        1
) aaa ON aaa. GROUP = base. GROUP

Answer 2

这将返回表格中的记录数量：

select count(*) from tablename;