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在PostgreSQL中,我试图根据另外两列中的值创建一个新列。如果early
或late
在Issues
列中,我想要显示delivery id
的每一行的时间增量。如果提前或延迟不在问题栏中,我想显示一个NULL/blank
值。SQL根据其他两列创建新列
我有什么:
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
我想要什么:
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