SQLServer Öд¦ÀíÁ½¸öÈÕÆÚÏà¼õµÃµ½ÌìÊý
DATEDIFF(datepart, startdate, enddate)
Datepart Abbreviations
year yy, yyyy
quarter qq, q
month mm, m
dayofyear dy, y
day dd, d
week wk, ww
hour hh
minute mi, n
second ss, s
millisecond ms
Ïà¹ØÎĵµ£º
create database db
use db
go
create table course
(
sno varchar(20),
cno int ,
Gmark int
)
insert into course values('20071513115',1,80)
insert into course values('20071513114',2,80)
insert into course values('20071513113',3,80)
insert into course values('20071513 ......
1. ΪºÎʹÓÃÓα꣺
ʹÓÃÓαê(cursor)µÄÒ»¸öÖ÷ÒªµÄÔÒò¾ÍÊǰѼ¯ºÏ²Ù×÷ת»»³Éµ¥¸ö¼Ç¼´¦Àí·½Ê½¡£ÓÃSQLÓïÑÔ´ÓÊý¾Ý¿âÖмìË÷Êý¾Ýºó£¬½á¹û·ÅÔÚÄÚ´æµÄÒ»¿éÇøÓòÖУ¬ÇÒ½á¹û
ÍùÍùÊÇÒ»¸öº¬Óжà¸ö¼Ç¼µÄ¼¯ºÏ¡£Óαê»úÖÆÔÊÐíÓû§ÔÚSQL serverÄÚÖðÐеطÃÎÊÕâЩ¼Ç¼£¬°´ÕÕÓû§×Ô¼ºµÄÒâÔ¸À´ÏÔʾºÍ´¦ÀíÕ ......
ʲôÊÇ´æ´¢¹ý³ÌÄØ£¿
¡¡¡¡¶¨Ò壺
¡¡¡¡½«³£ÓõĻòºÜ¸´ÔӵŤ×÷£¬Ô¤ÏÈÓÃSQLÓï¾äдºÃ²¢ÓÃÒ»¸öÖ¸¶¨µÄÃû³Æ´æ´¢ÆðÀ´, ÄÇôÒÔºóÒª½ÐÊý¾Ý¿âÌṩÓëÒѶ¨ÒåºÃµÄ´æ´¢¹ý³ÌµÄ¹¦ÄÜÏàͬµÄ·þÎñʱ,Ö»Ðèµ÷ÓÃexecute,¼´¿É×Ô¶¯Íê³ÉÃüÁî¡£
¡¡¡¡½²µ½ÕâÀï,¿ÉÄÜÓÐÈËÒªÎÊ£ºÕâô˵´æ´¢¹ý³Ì¾ÍÊÇÒ»¶ÑSQLÓï¾ä¶øÒѰ¡£¿
¡¡¡¡Microsoft¹«Ë¾ÎªÊ²Ã´»¹ ......
ÈçºÎÔÚSqlserverÖдÓÍⲿXMLÎļþÖжÁÈ¡ÅäÖÃÐÅÏ¢ÄØ£¿¸ÃÎÊÌâÔ´×ÔÒ»¼ÒÆóÒµµÄ±ÊÊÔÐÅÏ¢ÓиС£
Ò»xmlÎļþÄÚÈÝ£º
<?xml version="1.0" encoding="utf-8"?>
<root>
<db name="ClientDB1" datasize="512MB" datagrowth="100MB" logsize="100MB" loggrowth ="50MB">
</db>
<db ......
×Ö·û´®º¯Êý£º
¡ñ¡¡ASCII('a')=97---·µ»Ø×Öĸa¶ÔÓ¦µÄASCIIÂë
¡ñ¡¡CHAR('48')=0---·µ»Ø48Õâ¸öASCIIÂë¶ÔÓ¦µÄ×Ö·û
¡ñ¡¡LCASE('ABcdE')="abced" »ò LOWER('ABcdE')="abced"£¨½«¸ø¶¨×Ö·û´®×ªÎªÐ¡Ð´£©
¡ñ¡¡UCASE('ABcdE')="ABCDE" »ò UPPER('ABcdE')="ABCDE"£¨½«¸ø¶¨×Ö·û´®×ªÎª´óд£©
¡ñ¡¡LTRIM(' fgf gh ')="fgf ......