榪斿洖璺ㄤ袱涓寚瀹氭棩鏈熺殑鏃ユ湡鍜屾椂闂磋竟鐣屾暟銆?
DATEDIFF ( datepart , startdate , enddate )
datepart
鏄瀹氫簡(jiǎn)搴斿湪鏃ユ湡鐨勫摢涓閮ㄥ垎璁$畻宸鐨勫弬鏁般備笅琛ㄥ垪鍑轟簡(jiǎn) Microsoft® SQL Server™ 璇嗗埆鐨勬棩鏈熼儴鍒嗗拰緙╁啓銆?/font>
鏃ユ湡閮ㄥ垎 | 緙╁啓 |
---|---|
year | yy, yyyy |
quarter | qq, q |
Month | mm, m |
dayofyear | dy, y |
Day | dd, d |
Week | wk, ww |
Hour | hh |
minute | mi, n |
second | ss, s |
millisecond | ms |
startdate
鏄綆楃殑寮濮嬫棩鏈熴?em>startdate 鏄繑鍥?datetime 鎴?smalldatetime 鍊兼垨鏃ユ湡鏍煎紡瀛楃涓茬殑琛ㄨ揪寮忋?
鍥犱負(fù) smalldatetime 鍙簿紜埌鍒嗛挓錛屾墍浠ュ綋鐢?smalldatetime 鍊兼椂錛岀鍜屾縐掓繪槸 0銆?/font>
濡傛灉鎮(zhèn)ㄥ彧鎸囧畾騫翠喚鐨勬渶鍚庝袱浣嶆暟瀛楋紝鍒欏皬浜庢垨絳変簬"涓や綅鏁板勾浠芥埅姝㈡湡"閰嶇疆閫夐」鐨勫肩殑鏈鍚庝袱浣嶆暟瀛楃殑鏁板瓧鎵鍦ㄤ笘綰笌鎴騫存墍鍦ㄤ笘綰浉鍚屻傚ぇ浜庤閫夐」鐨勫肩殑鏈鍚庝袱浣嶆暟瀛楃殑鏁板瓧鎵鍦ㄤ笘綰負(fù)鎴騫存墍鍦ㄤ笘綰殑鍓嶄竴涓笘綰備緥濡傦紝濡傛灉 two digit year cutoff 涓?2049錛堥粯璁わ級(jí)錛屽垯 49 琚В閲婁負(fù) 2049錛?050 琚В閲婁負(fù) 1950銆備負(fù)閬垮厤妯$硦錛岃浣跨敤鍥涗綅鏁扮殑騫翠喚銆?/font>
鏈夊叧鏃墮棿鍊兼寚瀹氱殑鏇村淇℃伅錛岃鍙傝鏃墮棿鏍煎紡銆傛湁鍏蟲(chóng)棩鏈熸寚瀹氱殑鏇村淇℃伅錛岃鍙傝 datetime 鍜?smalldatetime銆?
enddate
鏄綆楃殑緇堟鏃ユ湡銆?em>enddate 鏄繑鍥?datetime 鎴?smalldatetime 鍊兼垨鏃ユ湡鏍煎紡瀛楃涓茬殑琛ㄨ揪寮忋?/font>
integer
startdate 鏄粠 enddate 鍑忓幓銆傚鏋?startdate 姣?enddate 鏅氾紝榪斿洖璐熷箋?/font>
褰撶粨鏋滆秴鍑烘暣鏁板艱寖鍥達(dá)紝DATEDIFF 浜х敓閿欒銆傚浜庢縐掞紝鏈澶ф暟鏄?24 澶?20 灝忔椂 31 鍒嗛挓闆?23.647 縐掋傚浜庣錛屾渶澶ф暟鏄?68 騫淬?/font>
璁$畻璺ㄥ垎閽熴佺鍜屾縐掕繖浜涜竟鐣岀殑鏂規(guī)硶錛屼嬌寰?DATEDIFF 緇欏嚭鐨勭粨鏋滃湪鍏ㄩ儴鏁版嵁綾誨瀷涓槸涓鑷寸殑銆傜粨鏋滄槸甯︽璐熷彿鐨勬暣鏁板鹼紝鍏剁瓑浜庤法絎竴涓拰絎簩涓棩鏈熼棿鐨?datepart 杈圭晫鏁般備緥濡傦紝鍦?1 鏈?4 鏃ワ紙鏄熸湡鏃ワ級(jí)鍜?1 鏈?11 鏃ワ紙鏄熸湡鏃ワ級(jí)涔嬮棿鐨勬槦鏈熸暟鏄?1銆?/font>
姝ょず渚嬬‘瀹氬湪 pubs 鏁版嵁搴撲腑鏍囬鍙戝竷鏃ユ湡鍜屽綋鍓嶆棩鏈熼棿鐨勫ぉ鏁般?/font>
USE pubs
GO
SELECT DATEDIFF(day, pubdate, getdate()) AS no_of_days
FROM titles
GO