繼續我的問題

summarizing-two-conditions-on-the-same-sql-table,我添加了一個RATIO列,它只是一個SUM(…)列除以第二個SUM(…)列：

SELECT

COMPANY_ID,

SUM(CASE WHEN STATUS IN (0, 1) THEN 1 ELSE 0 END) AS NON_BILLABLE,

SUM(CASE WHEN STATUS IN (2, 3) THEN 1 ELSE 0 END) AS BILLABLE

SUM(NON_BILLABLE)/SUM(BILLABLE) AS RATIO

FROM TRANSACTIONS

GROUP BY COMPANY_ID

像這樣定義RATIO看起來很漂亮和干凈,但顯然也是forbidden by SQL.

為了使查詢正常工作,我只復制了NON_BILLABLE和BILLABLE的CASE語句.

SELECT

COMPANY_ID,

SUM(CASE WHEN STATUS IN (0, 1) THEN 1 ELSE 0 END) AS NON_BILLABLE,

SUM(CASE WHEN STATUS IN (2, 3) THEN 1 ELSE 0 END) AS BILLABLE

SUM(CASE WHEN STATUS IN (0, 1) THEN 1 ELSE 0 END)/SUM(CASE WHEN STATUS IN (2, 3) THEN 1 ELSE 0 END) AS RATIO

FROM TRANSACTIONS

GROUP BY COMPANY_ID

是否有更好,更清晰(非冗余)的方式來編寫此查詢？

總結

以上是生活随笔為你收集整理的mysql列别名引用_引用聚合列的MySQL别名的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。