Çë½Ì¸öSQL²éѯÎÊÌâ - Oracle / ¿ª·¢
ÎÒÏÖÔÚÓÐÒ»Õűí ÀïÃæÓÐÁ½Ìõ¼Ç¼
name time
ÕÅ 3
Íõ 2
ÏÖÔÚÎÒÏëÒªµÃµ½µÄ½á¹ûÊÇtimeÊǼ¸¾Í»á²éѯ³ö¼¸Ìõ
name time
ÕÅ 1
ÕÅ 1
ÕÅ 1
Íõ 1
Íõ 1
Ôõô×ö
-- ÕâÑùÕû£ºÓÐÒâÒåÂð£¿
µ±È»ÓÐÒâÒåÁË£¬ÎÒÄõıíÖ»²»¹ýÊǾٸöÀý×Ó£¬Êµ¼ÊÓô¦µ±È»ÓÐÁË¡£ÎÒÔÚÕâÀïÖ»²»¹ýÊǰÑÀý×ÓÃèÊöµÄ¼ò»¯ÁË¡£
ºóÃæµÄtime×ֶνá¹ûÊǼ¸¶¼²»Ëùν£¬²»ÊÇ1Ò²ÐУ¬
ÕÅ 3
Íõ 2
ÏÖÔÚÎÒÏëÒªµÃµ½µÄ½á¹ûÊÇtimeÊǼ¸¾Í»á²éѯ³ö¼¸Ìõ
name time
ÕÅ 3
ÕÅ 3
ÕÅ 3
Íõ 2
Íõ 2
ÕâÑù¿ÉÄÜ»á¼òµ¥µã£¬Çë½Ì¸ßÊÖÀ´°ï°ïæ°¡
4Â¥£¬5Â¥µÄ·¢·¨¶¼¿ÉÒÔ£¬µ«ÊÇÎÒÕâ²éѯ½á¹ûÓÐ5000Ìõ×óÓÒ£¬Ö´ÐÐÁË20·ÖÖÓ»¹Ã»²é³öÀ´¡£¡£
¸Õ¸ÕÄǸöSQLµÄЧÂʵÄÈ·²»ºÃ£¬ÊÔÏÂÕâ¸ö
SQL code:
select a.name, a.time
from tb a,
(SELECT level l
from (select max(time) maxtime from tb)
CONNECT BY level <= maxtime) b
where a.time >= b.l
order by a.name
Ïà¹ØÎÊ´ð£º
ÕâÀïÏëÁ˽âÏ£¬¹ØÓÚSQL ServerÖзÖÒ³ºÍOracleÖзÖÒ³£»
ƽ³£Ð´Ó¦ÓóÌÐòµÄʱºò£¬±ÈÈçÓõÄÓïÑÔÊÇJava£¬ÓиöÁбíÒ³Ãæ£¬ÐèÒª¶ÔÊý¾Ý·ÖÒ³ÏÔʾ£»
ÕâÀïÒª·ÖÒ³ÄѵÀ²»ÐèÒª½èÖúJava£¬¶øÖ±½ÓsqlÄÜÖªµÀ·ÖÒ³Âð£¬ÆðÂëÒ²Òª´«¸öÒ³Âë½ ......
SQL code:
CREATE OR REPLACE PROCEDURE usp_refreshTopN IS
BEGIN
--Îĵµ
INSERT INTO topnresource(resourceId,title,type,cover,brief,properUser,tag,clickAmount,createDate,topNCreateDate,organizat ......
ÏÖÔÚ ÎÒÓÐ Êý¾Ý¿â oracle_A £¬ÀïÃæÓÐÕűí Ϊ table_A, È»ºóÎÒÒª¶¨Ê±µÄ °Ñ ÁíÒ»¸öÊý¾Ý¿â oracle_B,ÀïÃæµÄÒ»Õűí table_BµÄÊý¾Ý£¬ÐÂÔö·ÅÈëtable_AÀȻºóÔÙÇå¿Õtable_B£¬ÇëÎÊÓ¦¸ÃÔõô×ö£¿
ÓÃд¸ö´æ´¢¹ý³Ì£¬È»ºóÓ ......