本文為英文版的機器翻譯版本,如內容有任何歧義或不一致之處,概以英文版為準。
BETWEEN 範圍條件
BETWEEN
條件會使用關鍵字 BETWEEN
和 AND
,來檢定表達式是否在一系列值的範圍內。
語法
expression [ NOT ] BETWEEN expression AND expression
表達式可以是數值、字元或日期時間 (datetime) 資料類型,但這些類型必須相容。範圍包含端點。
範例
第一個範例會計算有多少交易已登錄售出 2、3 或 4 張票券:
select count(*) from sales where qtysold between 2 and 4; count -------- 104021 (1 row)
範圍條件包含開頭值與結尾值。
select min(dateid), max(dateid) from sales where dateid between 1900 and 1910; min | max -----+----- 1900 | 1910
範圍條件中第一個表達式的值,必須小於第二個表達式的值。由於表達式的值,下列的範例一律會傳回 0 列:
select count(*) from sales where qtysold between 4 and 2; count ------- 0 (1 row)
不過,套用NOT修改器會反轉邏輯,並產生所有資料列的計數:
select count(*) from sales where qtysold not between 4 and 2; count -------- 172456 (1 row)
下列的查詢會傳回擁有 20,000 到 50,000 個座位的場地清單:
select venueid, venuename, venueseats from venue where venueseats between 20000 and 50000 order by venueseats desc; venueid | venuename | venueseats ---------+-------------------------------+------------ 116 | Busch Stadium | 49660 106 | Rangers BallPark in Arlington | 49115 96 | Oriole Park at Camden Yards | 48876 ... (22 rows)
下列範例示範使用 BETWEEN做為日期值:
select salesid, qtysold, pricepaid, commission, saletime from sales where eventid between 1000 and 2000 and saletime between '2008-01-01' and '2008-01-03' order by saletime asc; salesid | qtysold | pricepaid | commission | saletime --------+---------+-----------+------------+--------------- 65082 | 4 | 472 | 70.8 | 1/1/2008 06:06 110917 | 1 | 337 | 50.55 | 1/1/2008 07:05 112103 | 1 | 241 | 36.15 | 1/2/2008 03:15 137882 | 3 | 1473 | 220.95 | 1/2/2008 05:18 40331 | 2 | 58 | 8.7 | 1/2/2008 05:57 110918 | 3 | 1011 | 151.65 | 1/2/2008 07:17 96274 | 1 | 104 | 15.6 | 1/2/2008 07:18 150499 | 3 | 135 | 20.25 | 1/2/2008 07:20 68413 | 2 | 158 | 23.7 | 1/2/2008 08:12
請注意,雖然 BETWEEN的範圍包含 ,但日期預設為時間值 00:00:00。範例查詢的唯一有效 1 月 3 日列是銷售時間為 1/3/2008 00:00:00
的列。