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在PostgreSQL中,我試圖根據另外兩列中的值創建一個新列。如果early
或late
在Issues
列中,我想要顯示delivery id
的每一行的時間增量。如果提前或延遲不在問題欄中,我想顯示一個NULL/blank
值。SQL根據其他兩列創建新列
我有什麼:
Delivery Id | Issues | Time delta
1 late 10
2 early -25
2 wrong address -25
3 not confirmed -10
4 late 8
5 not confirmed -8
5 wrong address -8
我想要什麼:
Delivery Id | Issues | New Time delta
1 late 10
2 early -25
2 wrong address -25
3 not confirmed
4 late 8
5 not confirmed
5 wrong address