Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

SQL Server:½«ÁиüдÓÒ»¸ö±í´«µÝµ½ÁíÒ»¸ö±í

ÎÊ£ºÔõÑùÔÚÒ»¸öUPDATEÓï¾äÖÐʹÓñíBµÄÈý¸öÁиüбíAÖеÄÈý¸öÁУ¿
¡¡¡¡´ð£º¶ÔÕâ¸öÎÊÌ⣬Äú¿ÉÒÔʹÓÃÇ¿´óµÄ¹ØÏµ´úÊý¡£±¾Ò³ÖеĴúÂë˵Ã÷ÁËÈçºÎ×éºÏʹÓÃfrom×Ó¾äºÍJOIN²Ù×÷£¬ÒÔ´ïµ½ÓÃÆäËû±íÖÐÊý¾Ý¸üÐÂÖ¸¶¨ÁеÄÄ¿µÄ¡£ÔÚÉè¼Æ¹ØÏµ±í´ïʽʱ£¬ÄúÐèÒª¾ö¶¨ÊÇ·ñÐèÒªµ¥Ò»ÐÐÆ¥Åä¶à¸öÐУ¨Ò»¶Ô¶à¹ØÏµ£©£¬»òÕßÐèÒª¶à¸öÐÐÆ¥Åä±»Áª½Ó±íÖеĵ¥Ò»ÐÐÒÔ¸üÐÂËùÓÐÐУ¨¶à¶ÔÒ»¹ØÏµ£©¡£
¡¡¡¡ÔÚÒ»¶Ô¶à¹ØÏµÖУ¬SQL ServerʼÖÕʹÓÃËüÕÒµ½µÄ×îºóÒ»ÐиüÐÂÊý¾Ý¡£µ«ÊÇ£¬ÄúÎÞ·¨¿ØÖÆ×îºóÒ»ÐÐËùÔÚµÄλÖá£ÔÚ¶à´¦ÀíÆ÷µÄ¼ÆËã»úÉÏ£¬²éѯ¿ÉÄÜÊÇͬ²½½øÐеģ¬ÏàͬµÄ²éѯ×îºóÒ»ÐеÄλÖÿÉÄܻ᲻ͬ¡£Òò´Ë£¬Microsoft½¨Ò龡Á¿²»ÒªÊ¹ÓÃÒ»¶Ô¶à¹ØÏµ¡£
¡¡¡¡Èç¹û´ý¸üеıíÓëfrom×Ó¾äÖеıíÏàͬ£¬²¢ÇÒfrom×Ó¾äÖ»°üº¬¶Ô¸Ã±íµÄÒ»¸öÒýÓ㬱ðÃû¿ÉÄÜδ±»Ö¸¶¨¡£Èç¹û´ý¸üеıíÔÚfrom×Ó¾äÖгöÏÖÁ˶à´Î£¬Ö»ÓиñíµÄÒ»¸öÒýÓÿÉÒÔÊ¡ÂÔ±íµÄ±ðÃû£¬¶Ô¸Ã±íµÄËùÓÐÆäËûÒýÓñØÐë°üº¬Ò»¸ö±í±ðÃû¡£
USE tempdb
GO
CREATE TABLE #t1 (c1 int NOT NULL, c2 char(5), c3 char(5),
 c4 char(5))
GO
CREATE TABLE #t2 (c1 int NOT NULL, c2 char(5), c3 char(5),
 c4 char(5))
GO
--Êý¾Ý¸³Öµ
INSERT #t1 values (1,'hello','there','fred')
INSERT #t2 values (1,'how','are','you?')
--¸üÐÂÊý¾Ý
UPDATE #t1 SET #t1.c2 = #t2.c2, #t1.c3 = #t2.c3,
 #t1.c4 = #t2.c4
from #t2
WHERE #t1.c1 = #t2.c1
--¼ì²é½á¹û
SELECT * from #t1


Ïà¹ØÎĵµ£º

sql 2005 ´æ´¢¹ý³Ì·ÖÒ³ java ´úÂë

 create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',         
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ ......

Oracle PL\SQL ²Ù×÷£¨Èý£©Oracleº¯Êý


1.ϵͳ±äÁ¿º¯Êý
£¨1£©SYSDATE
¸Ãº¯Êý·µ»Øµ±Ç°µÄÈÕÆÚºÍʱ¼ä¡£·µ»ØµÄÊÇOracle·þÎñÆ÷µÄµ±Ç°ÈÕÆÚºÍʱ¼ä¡£
select sysdate from dual;
insert into purchase values
(‘Small Widget’,’SH’,sysdate, 10);
insert into purchase values

(‘Meduem Wodget’,’SH’, ......

Oracle PL\SQL²Ù×÷£¨ËÄ£©Ë÷ÒýÓëÔ¼Êø

1.Êý¾Ý¿âµÄË÷Òý
       ¿ÉÒÔ½«Ë÷Òý¸ÅÄîÓ¦Óõ½Êý¾Ý¿â±íÉÏ¡£µ±Ò»¸ö±íº¬ÓдóÁ¿µÄ¼Ç¼ʱ£¬Oracle²éÕҸñíÖеÄÌØÐ´¼Ç¼Ҫ»¨ºÜ³¤µÄʱ¼ä——¾ÍÏñ»¨ºÜ³¤Ê±¼ä·­¿´È«ÊéÀ´²éÕÒij¸öÖ÷ÌâÒ»Ñù¡£OracleÓÐÒ»¸öÒ×ÓÚʹÓõŦÄÜ£¬¼´¿ÉÒÔ½¨Á¢Ò»¸ö´ÎÒþ²Ø±í£¬¸Ã±í°üº¬Ö÷±íÖеÄÒ»¸ö»ò¶à¸öÖØÒªµÄÁУ¬ÒÔ¼°ÔÚÖ÷± ......

oracle vs. SQL ͬÒå´Êsynonym ±ðÃû alias

oracle ͬÒå´Ê synonym ΪÊý¾Ý¿â¶ÔÏó½¨Á¢Í¬Òå´Êºó,µ±dba¶ÔÊý¾Ý¿â¶ÔÏó(table,view,ÐòÁÐ)×öÁËÒ»¸ö¼òµ¥¸Ä¶¯Ö®ºó,ÈçÃû×Ö»òÕ߽ṹ¸Ä±ä,Ôò²»ÐèÒªÖØÐ¸ü¸Ä²¢±àÒëÓ¦ÓÃ.ÔÚÊý¾Ý¿â×ÖµäÖÐÓж¨Òå,²»ÐèÒª½øÐÐÈκδ洢.
oracle±ðÃûalias,With as¡¡Éú³ÉÒ»¸öÁÙʱ±í£¬¶ÔÓÚ¸´ÔÓµÄÊý¾Ý²éѯ£¬¿ÉÒÔ¼õÉÙ×ÊÔ´ÏûºÄ¡¢Ìá¸ßÐÔÄÜ¡£9iÒýÈë¡£
with alias ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ