MySQL：Sub-select 未返回预期的 COUNT 个结果

Question

我有以下查询，它运行和处理正常，问题是子 select 只在 return 应该 return 时为 1 或 0在 WHERE 子句中指定的过去 24 小时内的所有记录中的 COUNT 并且都属于子 select 标准。

我怀疑问题出在 sub-select 一次只比较 ID 但我尝试将 WHERE tbr.ID = ID 更改为 WHERE tbr.ID IN (ID) 但它仍然只是 returning 1 或 0.

别名上的COUNT总计returns 728所以数据确实存在并且在过去24小时内有效，这个已经验证过了。

SELECT COUNT(tbr.`ID`) AS `total`
, (SELECT COUNT(`ID`) FROM `cred` WHERE tbr.`ID` = `ID` AND `match` = 'EXACT' AND `number` <> '') AS `exact`
, DATE(NOW()) AS `reportDate`
FROM `cred` tbr
WHERE tbr.`processed` >= (NOW() - INTERVAL 1 DAY);

Answer 1

SELECT COUNT(tbr.`ID`) AS `total`
, (SELECT COUNT(`ID`) 
    FROM `cred` 
    WHERE `ID` IN (tbr.`ID`)    --try with inverting this condition
        AND `match` = 'EXACT' 
        AND `number` <> '') AS `exact`
, DATE(NOW()) AS `reportDate`
FROM 
    `cred` tbr
WHERE 
    tbr.`processed` >= (NOW() - INTERVAL 1 DAY);

Answer 2

也许条件聚合会有所帮助。

SELECT 
   COUNT(tbr.`ID`) AS `total`
 , COUNT(case when match` = 'EXACT' AND `number` <> '' then tbr.`ID` end) AS `exact`
 , DATE (NOW()) AS `reportDate`
FROM `cred` tbr
WHERE  tbr.`processed` >= (NOW() - INTERVAL 1 DAY);

示例数据和预期结果有助于选择解决方案。

MySQL：Sub-select 未返回预期的 COUNT 个结果

MySQL: Sub-select not returning expected COUNT result

mysql

count

subquery