mysql - 尝试编写一个查询来计算具有不同情况的多个事物

Question

我需要帮助我正在尝试编写一个查询来计算具有不同情况的多个事物。 到目前为止，这是我能够进行单独查询的地方，但我想做的是将它们合并为一个

SELECT COUNT(*) AS "Marketing"
    FROM PROJECT
    WHERE Department = 'Marketing';

SELECT COUNT(*) AS "Number of Finance"
    FROM PROJECT
    WHERE Department = 'Finance';

SELECT COUNT(*) AS "Number of Accounting"
    FROM PROJECT
    WHERE Department = 'Accounting';

Answer 1

尝试 GROUP BY

SELECT Department, COUNT(*) AS Count
FROM PROJECT
WHERE Department IN  ('Marketing','Finance','Accounting')
GROUP BY Department