ÕýÔò±í´ïʽ ½âÎöSQL Óï·¨×Ö·û´®
×Ö·û´®ÑùÀý
JScript code:
select * from mtab
select * from mtab where id=10
select * (select * from mmtab where id=10) where id=10
//È¡µÃ (select * from mmtab where id=10)
select * (select * from mmtab where (id=10 and zz=5)) where id=10
//È¡µÃ (select * fro ......
select kes.k from
(SELECT acct.KesKigo+acct.KesNo as ak from acct) as a,
(SELECT count(acct.KesKigo+acct.KesNo) as k from acct, fd_user where acct.ActNo = fd_user.ActNo
group by acct.KesKigo+acct.KesNo) as kes
where kes.k = a.ak
Õâ¸öSQL´íÔÚÄÄÄØ
Ö´Ðб¨µÄ´íÊÇ£º構ÎÄ´íÎ ......
ÎÒ¾õµÃmysqlºÍsqlserverÓй²Í¬µÄµØ·½£º
ÓиöÎÊÌâÊǹØÓÚ±íµÄËøÎÊÌ⣺
½ø³ÌA ½ø³ÌB
select * from user where id in lock share mode£¨¹²ÏíËø)
update user set name='55' where id=1£¨´ËÊ ......
СµÜ×î½üºýÍ¿À²
Ïò¸÷λÇë½ÌÒ»ÏÂ
ÎÒÓÐÒ»Õűíst
×ֶΣº
Id chengji
±íÖеÄÊý¾ÝÓУº
1 ʤ
2 ¸º
1 ¸º
1 ¸º
ÎÒÏëµÃµ½ÕâÑùµÄ½á¹û;
id ʤ ¸º
......
select top 3 stuid from pagesize where stuid not in (select top 3 stuid from pagesize order by id asc) order by id ascÕâÀïµÄ·ÖÒ³sqlÓï¾äΪʲôҪ¼ÓÉÏÅÅÐòÄØ£¿²»ÅÅÐò²»ÐÐÂð£¿ÎÒ¿´µ½ºÜ¶àsqlÓï¾ä·ÖÒ³´úÂëÔÚÀ¨ºÅÍâÃæºÍÀïÃæ¶¼ÓÐÅÅÐò£¡ÄܾßÌå˵ÏÂʲôÂ𣿻òÕßÓÐÆäËûµÄÀý×ÓÀ´ËµÒ»Ï£¡£¿£¿
id stuid
1 1
2 2
3 2
......
ÓÐÁ½¸ö±í
#TeacherPlan(TeacherID,CourseID)
Ö÷¼ü£ºTeacherID,CourseID
#CourseTable(TeacherID,CourseID,Times)
Ö÷¼ü£ºTeacherID,CourseID,Times
ÈçºÎËæ»úµÃµ½Ò»¸ö#TeacherPlan±íÖеÄTeacherID£¬ ʹµÃ#TeacherPlan±íÖжÔÓ¦µÄCourseID=¡¯1¡¯£¬²¢ÇÒ#CourseTable±íÖиÃTeacherIDµÄ×ܼǼÊý<a£¨aΪһ¸öÕûÊý£©
±ÈÈ磺
......