SQL JOIN自我表

Question

我有一张桌子：

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

我如何构造一个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

Answer 2

SELECT * FROM table t1 JOIN table t2 ON t1.col_1=t2.col_1;