显示将多少行分组到同一字段中

Question

下面的查询显示了MySQL表中所有“zip”的列表。它将具有相同“zip”的行分组。

我怎样才能创建一个新变量来显示每个“zip”共享多少行？

$query2 = "select zip from submission
GROUP BY zip    
order by zip asc";  

Answer 1

将COUNT(*)添加到您的选择列表中：

SELECT zip, COUNT(*) FROM submission GROUP BY zip ORDER BY zip ASC