[SQL ] 請問如何相減再 group 起來?
看板Database作者fantasywater (prepare myself)時間8年前 (2015/09/10 06:09)推噓0(0推 0噓 1→)留言1則, 1人參與討論串1/2 (看更多)
+-------+-------+--------+---------+
| att1 | att2 | in/our | time |
+-------+-------+--------+---------+
| A | B | in | 7:00 |
+-------+-------+--------+---------+
| C | D | out | 7:50 |
+-------+-------+--------+---------+
| A | B | out | 7:20 |
+-------+-------+--------+---------+
| C | D | in | 7:10 |
+-------+-------+--------+---------+
請問如何下 SQL 計算時間差再 group 起來呢..?
結果希望像下面這樣..苦手中..
+-------+-------+-------------------+
| att1 | att2 | time_diff |
+-------+-------+-------------------+
| A | B | 10 |
+-------+-------+-------------------+
| C | D | 40 |
+-------+-------+-------------------+
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