Mysql 基于列值的SQL组行

示例地址表

ID, EmployeeID, Address

1, 100, TownA
2, 200, TownA
3, 300, TownB

如何返回每个唯一地址的所有员工的计数

e、 g

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你应该按照这个思路做点什么

SELECT count(EmployeeID) as EmployeeCount, Address FROM table GROUP BY Address

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这是一个简单的分组

SELECT Count(*) EmployeeCount, Address
FROM yourTable
GROUP BY Address

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使用group by and count（column）

选择count（ID）作为EmployeeCount，Address FROM tblAddress group by Address

我问了一个错误的问题，而不是EmployeeId的问题，我有一列二进制文件，想求和而不是计数，但你的答案是正确的，谢谢

SELECT Count(*) EmployeeCount, Address
FROM yourTable
GROUP BY Address