MySQL的分页技术总结

Posted 2020-08-03 moss_tan_jun

利用子查询示例:

SELECT * FROM your_table WHERE id <= 
(SELECT id FROM your_table ORDER BY id desc LIMIT ($page-1)*$pagesize )

ORDER BY id desc LIMIT $pagesize

利用连接示例:

SELECT * FROM your_table AS t1 
JOIN (SELECT id FROM your_table ORDER BY id desc LIMIT ($page-1)*$pagesize ) AS t2 
WHERE t1.id <= t2.id ORDER BY t1.id desc LIMIT $pagesize;

 

select count(*) 和 select count(1)有什么区别

count(1)就是count(1)，这表明是求值。
count(*)变成了count(0)，这表明是计算行数的。