SqlÓï¾ä - MS-SQL Server / ÒÉÄÑÎÊÌâ
дһ¸öSQlÓï¾äµÃµ½Ò»¸ö±íµÄ×îºóÒ»ÐеÄÖµ£¿
SQL code:
select top 1 * from tb order by id desc
Êý¾Ýû¹æÂÉ£¿1Â¥µÄÓï¾ä³ý·ÇÄãidÊÇ×ÔÔöÁС£·ñÔò²»ºÃ´¦Àí¡£
SQL code:
select top 1 * from tb order by id desc
Èç¹ûÓÐidµÄ»°¡£
Ó¦¸Ã°ÑÄãÕâ¸ö±íµÄÌØÕ÷˵³öÀ´£¬±ÈÈçÓÐʲô±È½ÏÌØÊâµÄ×ֶΡ£¡£±ÈÈç×ÔÔöÁеȡ£
Èç¹ûÖ÷¼üûɶ¹æÂÉ£¬¾ÍÉú³É¸ö¸¨ÖúÁУº
select id=identity(1,1),* into # from ±íÃû
select top 1 * from # order by id desc
È˼Òû˵ÓÐ
Ҳû˵ûÓа¡
ÎҾ͵±Óд¦Àí°¡
Ïà¹ØÎÊ´ð£º
¿ÉÄÜÒòΪ¹¤×÷µÄÔÒò ½Ó´¥Êý¾Ý¿âÕâ¿é±È½ÏÉÙ£¬Ö®Ç°¶¼ÊÇ×ö³ÌÐòÕâ¿é£¬Êý¾Ý¿âÕâ¿é¶¼ÓÐרÃŵÄÈËÀ´×ö ·Ö¹¤¶¼ºÜÃ÷ϸ ËùÒÔ¶ÔÊý¾Ý¿âÕâÒ»¿éÍêÈ«²»Á˽⡣ǰ¶Îʱ¼ä È¥ÃæÊÔÁ˼¸¼Ò¹«Ë¾ ¼¸ºõ¶¼ÊÇÔÚÊý¾Ý¿âÕâ¿é¹ÒµôµÄ Á¬¸ö¼òµ¥µÄSQ ......
ÕâÀïÏëÁ˽âÏ£¬¹ØÓÚSQL ServerÖзÖÒ³ºÍOracleÖзÖÒ³£»
ƽ³£Ð´Ó¦ÓóÌÐòµÄʱºò£¬±ÈÈçÓõÄÓïÑÔÊÇJava£¬ÓиöÁбíÒ³Ã棬ÐèÒª¶ÔÊý¾Ý·ÖÒ³ÏÔʾ£»
ÕâÀïÒª·ÖÒ³ÄѵÀ²»ÐèÒª½èÖúJava£¬¶øÖ±½ÓsqlÄÜÖªµÀ·ÖÒ³Âð£¬ÆðÂëÒ²Òª´«¸öÒ³Âë½ ......
ÏÖÔÚÓÐÒ»¸ö²¿Ãűídept£¨²¿ÃÅÃû³Æ£¬²¿Ãźš£¡££©ÓÐÒ»¸öÈËÔ±±íemp£¨ÐÕÃû£¬ÈËÔ±±àºÅ£¬Ö°Î»£¬Ð½×Ê£¬²¿ÃÅ£©
emp±íÖеÄÄÚÈÝÊÇÕâÑùµÄ£º
a 1 ¹¤³Ìʦ 3000 Èí¼þ²¿
b 2 ÆÕͨԱ¹¤ 2000 Ó²¼þ²¿
c 3 ¹¤³Ìʦ 4000 Ó²¼þ²¿
d ......
¸÷λºÃ£¬ÎÒ¸Õ°ÑÒ»¸öASPÍøÕ¾ÉèÖúÃÁË£¬Ò²ÄÜÕý³£·ÃÎÊ¡£µ«ÊÇÔÚÎÒ±¾»úÉϲ»ÄÜ´ò¿ªadmin\login.asp,ËùÒÔÎÞ·¨ÊµÏÖºǫ́¹ÜÀí¡££¨´íÎóÌáʾÎÞ·¨ÕÒµ½ÍøÒ³£¬´úÂë404£¬ÎҵIJÙ×÷ϵͳÊÇwin2000 server)
µ«ÊÇÆæ¹ÖµÄÊÇÔÚ¾ÖÓòÍøµÄÆäËû» ......
select o_customer,o_price from orders having o_price >=avg(o_price)
select o_customer,o_price from orders where o_price >=(select avg(o_price) from orders)
ÎҸоõûÓÐÇø±ð°¡£¬ÔõôÔÚmysql»áÓÐ ......