mysql - SQL JOIN 自表

Question

我有一张 table :

col_1        col_2        col_3
10001        apple        3
10001        orange       2
10001        orange       5
10001        orange       8

我怎样才能构造一个 SQL 语句来得到这样的东西:

col_1        col_2        col_3        col_2        col_3
10001        apple        3            orange       2
10001        apple        3            orange       5
10001        apple        3            orange       8

Answer 1

SELECT * 
FROM table t1 
    JOIN table t2 
        ON t1.col_1 = t2.col_1 
        AND t1.col_2 < t2.col_2