sql - 如何使用 SQL 将具有不同选择条件的多列插入到另一个表中

Question

我有两个表ForecastBackup，ForecastTotal 我想从 ForecasTotal 表中选择 4 列并插入到 ForecastBackup

例如 预测总计

UCPVol  UCPVal  IBNSINAVol  IBNSINAVal
1         1      NULL        NULL
2         3      NULL        NULL
NULL     NULL    1            4
NULL     NULL    3            5
NULL     NULL    1            6

我想插入ForecastBackup非空值 我的意思是结果应该是

UCPVol  UCPVal  IBNSINAVol  IBNSINAVal
    1         1      1            4
    2         3      3            5
    NULL     NULL    1            6

我使用了这个 SQL 命令，但不起作用

    INSERT INTO
    ForecastBackup (UCPVol,UCPVal,IBNSINAVol,IBNSINAVal)
    SELECT (select UCPVol,UCPVal from ForecastTotal where UCPVol is not null),
    (select IBNSINAVol,IBNSINAVal from ForecastTotal where IBNSINAVal is not null)
 from ForecastTotal

这可能吗？

Answer 1

根据您的输入和输出，我认为您需要此查询

INSERT INTO ForecastBackup (UCPVol,UCPVal, IBNSINAVol, IBNSINAVal) 
    SELECT
        A.UCPVol, A.UCPVal, B.IBNSINAVol, B.IBNSINAVal  
    FROM 
        ForecastTotal A
    LEFT JOIN
        ForecastTotal B ON A.UCPVal = B.IBNSINAVol