经典SQL

1、排名

select (select count(*) from table where k.ci_rank_point<=ci_rank_point) as paiming
from `table` k
where ci_id=2;

2、MySQL中实现rownum功能类似的语句

SELECT @rownum:=@rownum+1 AS rownum, frutas.*
FROM (SELECT @rownum:=0) r, frutas;

3、重置自动增长主键列

TRUNCATE table article_share

5、随机数

SELECT *
FROM `table` AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM `table`)-(SELECT MIN(id) FROM `table`))+(SELECT MIN(id) FROM `table`)) AS id) AS t2
WHERE t1.id >= t2.id
ORDER BY t1.id LIMIT 1;