tbl
SEQ1 | SEQ2 | D1 | D2 ---: | ---: | :------------------ | :-------- 1 | 1 | 12-SEP-19 4:10:00 PM| 12-SEP-19 4:14:00 PM 2 | 2 | 12-SEP-19 4:20:00 PM| 12-SEP-19 4:36:00 PM 3 | 3 | 12-SEP-19 4:30:00 PM| 12-SEP-19 4:52:00 PM 4 | 4 | 12-SEP-19 4:35:00 PM| 12-SEP-19 5:16:00 PM 5 | null | 12-SEP-19 4:40:00 PM| null 6 | null | 12-SEP-19 4:45:00 PM| null 7 | null | 12-SEP-19 4:50:00 PM| null 8 | null | 12-SEP-19 5:00:00 PM| null 9 | null | 12-SEP-19 5:10:00 PM| null 10| null | 12-SEP-19 5:20:00 PM| null
我想基于这样的d1数据更改订单d2
SEQ1 | SEQ2 | D1 | D2 ---: | ---: | :------------------ | :-------- 1 | 1 | 12-SEP-19 4:10:00 PM| 12-SEP-19 4:14:00 PM 2 | null | 12-SEP-19 4:20:00 PM| null 3 | null | 12-SEP-19 4:30:00 PM| null 4 | null | 12-SEP-19 4:35:00 PM| null 5 | 2 | 12-SEP-19 4:40:00 PM| 12-SEP-19 4:36:00 PM 6 | null | 12-SEP-19 4:45:00 PM| null 7 | null | 12-SEP-19 4:50:00 PM| null 8 | 3 | 12-SEP-19 5:00:00 PM| 12-SEP-19 4:52:00 PM 9 | null | 12-SEP-19 5:10:00 PM| null 10| 4 | 12-SEP-19 5:20:00 PM| 12-SEP-19 5:16:00 PM
如何订购表和更改头寸行数据? 请帮助我...
db <>提琴here
答案 0 :(得分:1)
使用以下排序逻辑:
ORDER BY COALESCE(D2, D1)
您更新的查询:
SELECT
SEQ1,
SEQ2,
D1,
D1
FROM yourTable
ORDER BY
COALESCE(D2, D1);