MySQL查询中LIMIT关键字的用途是什么？
MySQL中的LIMIT关键字可以指定要在输出中返回的记录数。LIMIT子句限制要返回的行数。通过以下示例可以理解-
示例
mysql> Select * from Student_info; +------+---------+------------+------------+ | id | Name | Address | Subject | +------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Chandigarh | Literature | | 125 | Raman | Shimla | Computers | | 130 | Ram | Jhansi | Computers | | 132 | Shyam | Chandigarh | Economics | | 133 | Mohan | Delhi | Computers | | 150 | Saurabh | NULL | Literature | +------+---------+------------+------------+ 7 rows in set (0.00 sec)
上面的结果集显示表'student_info'总共有7行。
但是，如果我们只想获取输出中的前2行，则可以使用LIMIT关键字，后跟2，如下所示-
mysql> Select * from Student_info LIMIT 2; +------+---------+------------+------------+ | id | Name | Address | Subject | +------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Chandigarh | Literature | +------+---------+------------+------------+ 2 rows in set (0.00 sec)