sql - 更新查询标识符

Question

UPDATE Table1 a
SET a.Col2 = (
    SELECT SubStr(Trim(b.Col2),-10,10)
    FROM Table2 b
    WHERE (InStr(SubStr(Trim(b.Col2),-5,5),'/')=1 
        AND InStr(SubStr(Trim(b.Col2),1,(Length(Trim(b.Col2))-10)),'/')=0 
        AND SubStr(b.Col1,1,2)='01'
        AND b.Col3 != 000103))
WHERE SubStr(b.Col1,-8,8)=SubStr(a.Col1,1,8)
    AND a.Col3 = 1;

命令行错误：9 列：14 错误报告：SQL 错误：ORA-00904：“B”。“Col1”：无效标识符 00904。00000 -“%s：无效标识符”

第 9 行是WHERE SubStr(b.Col1,-8,8)=SubStr(a.Col1,1,8)

Answer 1

您可以尝试MERGE：

MERGE INTO Table1 a
USING (
    SELECT *
    FROM Table2 b
    WHERE (InStr(SubStr(Trim(b.Col2),-5,5),'/')=1 
        AND InStr(SubStr(Trim(b.Col2),1,(Length(Trim(b.Col2))-10)),'/')=0 
        AND SubStr(b.Col1,1,2)='01'
        AND b.Col3 != 000103)
) c ON (SubStr(c.Col1,-8,8)=SubStr(a.Col1,1,8))
WHEN MATCHED THEN
    UPDATE SET a.Col2 = SubStr(Trim(c.Col2),-10,10)
        WHERE a.Col3 = 1;