MSSQL ʵÏÖ MySQL µÄ limit ²éѯ·½Ê½
MSSQL ÈçºÎʵÏÖ MySQL µÄ limit ²éѯ·½Ê½
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Code:
SELECT * from
(
SELECT TOP [ÿҳ¼Ç¼]
* from
(
SELECT TOP [ÿҳ¼Ç¼*µ±Ç°Ò³Êý]
[×Ö¶Î1, ×Ö¶Î2, ...]
from [Êý¾Ý±í]
ORDER BY [ÅÅÐò×Ö¶Î]
DESC
)
[±í±ðÃû1]
ORDER BY [ÅÅÐò×Ö¶Î]
)
[±í±ðÃû2]
ORDER BY [ÅÅÐò×Ö¶Î]
DESC
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Code:
SELECT * from
(
SELECT TOP 5 * from
(
SELECT TOP 10 *
from table
ORDER BY id DESC
) t1
ORDER BY id
) t2
ORDER BY id DESC
ÉÏÃæµÄ´úÂë±íʾ´Ó table ±íÖлñÈ¡¼Ç¼£¬Ã¿Ò³5Ìõ¼Ç¼£¬µ±Ç°ÊǵڶþÒ³5*2=10£¬½á¹û°´ÕÕ id µ¹ÐòÅÅÁС£
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Ê×ÏÈÊǰ²×°mysql·þÎñ:
mysql-nt –install
net start mysql
µ±È»Ó´ÔÚbinĿ¼ÔËÐÐÕâ¸öÃüÁîÁË
Ð¶ÔØµÄÃüÁîÊÇ:
net stop "MySQL"
mysqld-nt.exe –remove "MySQL"
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Maste ......
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1.CONCAT(str1,str2,...)
mysql> ? concat;
mysql> SELECT CONCAT('My', 'S', 'QL');
+-------------------------+
| CONCAT('My', 'S', 'QL') |
+-------------------------+
| MySQL ......
1.Í£µômysqld
service mysqld stop
2.ÖØÆômysqld£¬Ö¸¶¨²ÎÊý
service mysqld start --skip-networking --skip-grant-tables
»òÕß
/opt/mysql/bin/mysqld_safe --skip-networking --skip-grant-tables &
/opt/mysql/ÊÇÎÒµÄMYSQL°²×°Â·¾¶
skip-grant-tables:Á¬½ÓÊ±Ìø¹ýÊ ......