SQL查询获取合并结果

Question

I am trying to get the result from a table using MySQL query. What I want to do is I am trying to fetch 20 records from the table. In these 20 records, first 15 records must be in ascending order and the last 5 records must be in descending order. I am trying but I am not getting a way to get this done.

I don't know how to write sub queries.

Thanks.

Answer 1

You can use UNION ALL

(SELECT *
  FROM table1
 ORDER BY column_name 
 LIMIT 15)
 UNION ALL
(SELECT *
  FROM table1
 ORDER BY column_name DESC
 LIMIT 5)

Here is SQLFiddle demo