Q

MySQL的GROUP BY列

2016-12-01 104 views 0 likes

0

的不同組合，說我有以下結果從一個MySQL查詢設置：MySQL的GROUP BY列

col1 | col2 | col3 
-----|------|------ 
1 | 2 | 
2 | 1 | 
1 | 3 | 
3 | 1 | 
3 | 1 |

我怎樣才能組結果集，使得它看起來像：

col1 | col2 | col3 
-----|------|------ 
    1 | 2 | 
    1 | 3 |

2016-12-01 Jimmy P

+0

..GROUP最不（COL1，COL2），GREATEST（COL1，COL2） – Mihai

+0

我試着GROUP BY（col1，col2），以及選擇col1和col2作爲DISTINCT列，但都不起作用。 –

+0

Mihai的評論爲我工作，謝謝。 –

A

回答

0

每米哈伊的原來的問題意見，解決辦法是：

GROUP BY LEAST(col1, col2), GREATEST(col1, col2)

2016-12-01 22:13:13

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