精品日韩99亚洲的在线发布,亚洲精品国产高清嫩草影院 ,国产亚洲日韩在线a不卡

select * from table LIMIT 5,10; #榪斿洖絎?-15琛屾暟鎹?
select * from table LIMIT 5; #榪斿洖鍓?琛?
select * from table LIMIT 0,5; #榪斿洖鍓?琛?/div>
鎬ц兘浼樺寲錛氬熀浜嶮ySQL5.0涓璴imit鐨勯珮鎬ц兘,鎴戝鏁版嵁鍒嗛〉涔熼噸鏂版湁浜嗘柊鐨勮璇?

1.
Select * From cyclopedia Where ID>=(
Select Max(ID) From (
Select ID From cyclopedia Order By ID limit 90001
) As tmp
) limit 100;

2.
Select * From cyclopedia Where ID>=(
Select Max(ID) From (
Select ID From cyclopedia Order By ID limit 90000,1
) As tmp
) limit 100;

鍚屾牱鏄彇90000鏉″悗100鏉¤褰?絎?鍙ュ揩榪樻槸絎?鍙ュ揩?
絎?鍙ユ槸鍏堝彇浜嗗墠90001鏉¤褰?鍙栧叾涓渶澶т竴涓狪D鍊間綔涓鴻搗濮嬫爣璇?鐒跺悗鍒╃敤瀹冨彲浠ュ揩閫熷畾浣嶄笅100鏉¤褰?br />絎?鍙ユ嫨鏄粎浠呭彇90000鏉¤褰曞悗1鏉?鐒跺悗鍙朓D鍊間綔璧峰鏍囪瘑瀹氫綅涓?00鏉¤褰?br />絎?鍙ユ墽琛岀粨鏋?100 rows in set (0.23) sec
絎?鍙ユ墽琛岀粨鏋?100 rows in set (0.19) sec

寰堟槑鏄劇2鍙ヨ儨鍑?鐪嬫潵limit濂藉儚騫朵笉瀹屽叏鍍忔垜涔嬪墠鎯寵薄鐨勯偅鏍峰仛鍏ㄨ〃鎵弿榪斿洖limit offset+length鏉¤褰?榪欐牱鐪嬫潵limit姣旇搗MS-SQL鐨凾op鎬ц兘榪樻槸瑕佹彁楂樹笉灝戠殑.

鍏跺疄絎?鍙ュ畬鍏ㄥ彲浠ョ畝鍖栨垚

Select * From cyclopedia Where ID>=(
Select ID From cyclopedia limit 90000,1
)limit 100;

鐩存帴鍒╃敤絎?0000鏉¤褰曠殑ID,涓嶇敤緇忚繃Max榪愮畻,榪欐牱鍋氱悊璁轟笂鏁堢巼鍥犺楂樹竴浜?浣嗗湪瀹為檯浣跨敤涓嚑涔庣湅涓嶅埌鏁堟灉,鍥犱負鏈韓瀹氫綅ID榪斿洖鐨勫氨鏄?鏉¤褰?Max鍑犱箮涓嶇敤榪愪綔灝辮兘寰楀埌緇撴灉,浣嗚繖鏍峰啓鏇存竻娣呮槑鏈?鐪佸幓浜嗙敾铔囬偅涓€瓚?

鍙槸,鏃㈢劧MySQL鏈塴imit鍙互鐩存帴鎺у埗鍙栧嚭璁板綍鐨勪綅緗?涓轟粈涔堜笉騫茶剢鐢⊿elect * From cyclopedia limit 90000,1鍛?宀備笉鏇寸畝媧?
榪?鏍鋒兂灝遍敊浜?璇曚簡灝辯煡閬?緇撴灉鏄?1 row in set (8.88) sec,鎬庝箞鏍?澶熷悡浜虹殑鍚?璁╂垜鎯寵搗浜嗘槰澶╁湪4.1涓瘮榪欒繕鏈夎繃涔嬬殑"楂樺垎".Select * 鏈€濂戒笉瑕侀殢渚跨敤,瑕佹湰鐫€鐢ㄤ粈涔?閫変粈涔堢殑鍘熷垯, Select鐨勫瓧孌佃秺澶?瀛楁鏁版嵁閲忚秺澶?閫熷害灝辮秺鎱? 涓婇潰2縐嶅垎欏墊柟寮忓摢縐嶉兘姣斿崟鍐欒繖1鍙ュ己澶氫簡,铏界劧鐪嬭搗鏉ュソ鍍忔煡璇㈢殑嬈℃暟鏇村涓€浜?浣嗗疄闄呬笂鏄互杈冨皬鐨勪唬浠鋒崲鍙栦簡楂樻晥鐨勬€ц兘,鏄潪甯稿€煎緱鐨?

絎?縐嶆柟妗堝悓鏍峰彲鐢ㄤ簬MS-SQL,鑰屼笖鍙兘鏄渶濂界殑.鍥犱負闈犱富閿甀D鏉ュ畾浣嶈搗濮嬫鎬繪槸鏈€蹇殑.

Select Top 100 * From cyclopedia Where ID>=(
Select Top 90001 Max(ID) From (
Select ID From cyclopedia Order By ID
) As tmp
)

浣嗕笉綆℃槸瀹炵幇鏂瑰紡鏄瓨璐繃紼嬭繕鏄洿鎺ヤ唬鐮佷腑,鐡墮濮嬬粓鍦ㄤ簬MS-SQL鐨凾OP鎬繪槸瑕佽繑鍥炲墠N涓褰?榪欑鎯呭喌鍦ㄦ暟鎹噺涓嶅ぇ鏃舵劅鍙椾笉娣?浣嗗鏋滄垚鐧句笂鍗冧竾,鏁堢巼鑲畾浼氫綆涓嬬殑.鐩告瘮涔嬩笅MySQL鐨刲imit灝辨湁浼樺娍鐨勫,鎵ц:
Select ID From cyclopedia limit 90000
Select ID From cyclopedia limit 90000,1
鐨勭粨鏋滃垎鍒槸:
90000 rows in set (0.36) sec
1 row in set (0.06) sec
鑰孧S-SQL鍙兘鐢⊿elect Top 90000 ID From cyclopedia 鎵ц鏃墮棿鏄?90ms,鎵ц鍚屾牱鐨勬搷浣滄椂闂翠篃涓嶅強MySQL鐨?60ms.

ltsj 2012-04-12 16:30 鍙戣〃璇勮