Question

我有一个类似的查询：

SELECT count( * ) AS total, remaining
FROM cold_clients, (
   SELECT count( * ) AS remaining
   FROM cold_clients
   WHERE sic_code = '754901'
   AND STATUS = 'COLD'
) AS r
WHERE sic_code = '754901';

我得到了正确的sic代码和剩余的sic代码的正确结果。但是，它特定于sic代码的特定价值。我希望得到所有的sic代码，包括它的总值和剩余值。

我尝试过group by，但是，它给了我错误的价值。

Answer 1

使用条件聚合：

SELECT count( * ) AS total,
       sum(STATUS = 'COLD') as remaining
FROM cold_clients
WHERE sic_code = '754901';

对于所有sic_code，请使用聚合：

SELECT sic_code, count(*) AS total,
       sum(STATUS = 'COLD') as remaining
FROM cold_clients
GROUP BY sic_code;

在mysql中按问题分组

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