使用GROUP BY检索满足条件的记录

Question

我现在只想从几千条记录中选择计数大于1的行(换句话说是重复数据),我主要看到1s,其中有2s和3s在这里和那里

SELECT count( * ) AS `Number` , GI . *
FROM `GeneralInformation` AS GI
GROUP BY `FirstName` , `Surname` 

我怎样才能做到这一点？

Answer 1

SELECT count( * ) AS `Number` , GI . *
FROM `GeneralInformation` AS GI
GROUP BY `FirstName` , `Surname` 
HAVING count(*)>1

Answer 2

使用Having子句

SELECT count( * ) AS `Number` , GI . *
FROM `GeneralInformation` AS GI
GROUP BY `FirstName` , `Surname` 
HAVING count( * ) > 1