mysql有和聚合函数

Question

我试着用max来获得所有“balcao”。 “nCli”的值

SELECT cli.idBalcao, count(*) AS nCLientes
  FROM cliente AS cli
  GROUP BY cli.idBalcao
  HAVING nClientes=MAX(nClientes)

任何人都知道为什么不起作用？ 我使用用户定义的变量解决了它，但是这段代码应该适用于MySQL。

Answer 1

如果将其更改为

，该怎么办？

SELECT cli.idBalcao, count(*) AS nCLientes,
MAX(nCli) as maxClientes
  FROM cliente AS cli
  GROUP BY cli.idBalcao
  HAVING nClientes = maxClientes

（OR）

SELECT cli.idBalcao, count(*) AS nCLientes
  FROM cliente AS cli
  GROUP BY cli.idBalcao
  HAVING nClientes IN (select MAX(nCli) from cliente)