ms sql count distinct的相關文章
ms sql count distinct的相關商品
SQL Server: efficient DISTINCT on dates | EXPLAIN EXTENDED
瀏覽:388
日期:2026-04-20
This table has 2,000,000 records with 1,389 distinct dates. There is an index on a DATETIME column as well as an index on a computed persisted DATE column. Let's use plain DISTINCT clause on DATETIME column casted to a DATE: SELECT COUNT(date ......看更多

![Google 的新世代電郵: “Inbox” app 令電郵從此不一樣 [圖庫+影片]](https://www.iarticlesnet.com/pub/img/article/67270/1414048897451_xs.jpg)
![Avengers 2 兩分鐘預告片大公開: 巨人 Iron Man 新敵人首次現身 [影片]](https://www.iarticlesnet.com/pub/img/article/67268/1414045277740_xs.jpg)













