MySQL的隨機選擇查詢1日申請

Question

我有表MY_TABLE

id type info 
1 1 car 
2 1 bicycle 
3 1 train 
4 2 ketchup 
5 2 mustard 
6 2 soda 
7 3 flower 
8 3 tree 
9 3 grass 

我需要做出選擇查詢，以便結果出來像

type info 
1 car 
2 ketchup 
3 flower 

1 bicycle 
2 mustard 
3 tree 

1 train 
2 soda 
3 grass 

現在

會按類型數據

SELECT * from my_table ORDER BY type ASC 

按訂單類型111 222 333，我需要ty pe 123 123 123.

Answer 1

MySQL沒有窗口函數，所以這比在其他數據庫中更加尷尬。

SELECT type, info 
FROM (
    SELECT @rank := IF(type=@type, @rank+1, 1) AS rank, @type:=type AS type, info 
    FROM (SELECT @rank:=0, @type:=null) _init, my_table 
    ORDER BY type, id 
) t 
ORDER BY rank, type; 

SQL Fiddle