MYSQL LIMIT 用法详解

Posted 2020-08-31

在mysql的limit用法中，网上有这样的论述：

"//为了检索从某一个偏移量到记录集的结束所有的记录行，可以指定第二个参数为 -1： 

mysql> SELECT * FROM table LIMIT 95,-1; // 检索记录行 96-last. "

写这句话的人自己肯定没有实际去操作，因为这是不对的。

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘-1‘ at line 3

来看看mysql的官方文档：http://dev.mysql.com/doc/refman/6.0/en/select.html

The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement. LIMIT takes one or two numeric arguments, which must both be nonnegative integer constants(-1退下！), with these exceptions:

Within prepared statements, LIMIT parameters can be specified using ? placeholder markers.

Within stored programs, LIMIT parameters can be specified using integer-valued routine parameters or local variables.

With two arguments, the first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 (not 1):

SELECT * FROM tbl LIMIT 5,10; # Retrieve rows 6-15

To retrieve all rows from a certain offset up to the end of the result set, you can use some large number for the second parameter. This statement retrieves all rows from the 96th row to the last:

SELECT * FROM tbl LIMIT 95,18446744073709551615;

With one argument, the value specifies the number of rows to return from the beginning of the result set:

SELECT * FROM tbl LIMIT 5; # Retrieve first 5 rows
In other words, LIMIT row_count is equivalent to LIMIT 0, row_count.