Mysql清除代码在一行中

Question

我正在google和stackoverflow.com上搜索我怎样才能清楚地写出这段代码，但一无所获。 任何的想法？

MySQL查询：

SELECT COUNT(*) AS `allInvoice`,
    (SELECT COUNT(*) FROM `ocr_entity` WHERE `status` = 0) AS `new`,
    (SELECT COUNT(*) FROM `ocr_entity` WHERE `status` = 10) AS `notTemplate`,
    (SELECT COUNT(*) FROM `ocr_entity` WHERE `status` = 50) AS `withMistake`,
    (SELECT COUNT(*) FROM `ocr_entity` WHERE `status` = 100) AS `finished`,
    (SELECT COUNT(*) FROM `ocr_entity` WHERE `status` = 200) AS `skipped`  
    FROM `ocr_entity`;

Answer 1

使用条件聚合：

SELECT COUNT(*) AS `allInvoice`,
       SUM( `status` = 0 ) AS `new`,
       SUM( `status` = 10 ) AS `notTemplate`,
       SUM( `status` = 50 ) AS `withMistake`,
       SUM( `status` = 100 ) AS `finished`,
       SUM( `status` = 200 ) AS `skipped`  
FROM `ocr_entity`;

MySQL将布尔值视为数字上下文中的数字，0表示false，1表示true（这就是SUM()工作的原因）。