更新查询在SQL Server中运行,但在Oracle中不运行

Question

我需要此更新查询在SQL Server和Oracle上运行.如果重要的话,我们的Oracle版本是10.2.当我在Oracle中运行查询时,我得到"ERROR ORA-00933:SQL命令未正确结束".为了让它在Oracle中运行,我需要做什么？

UPDATE dbo.tableUpdate
SET fieldA = tt.fieldB
FROM dbo.tableTranslate tt
WHERE
    tt.fieldC = dbo.tableUpdate.fieldC
    AND
    tt.fieldD = dbo.tableUpdate.fieldA
    AND
    1 = (
        SELECT COUNT(tblTrans.fieldD) 
        FROM dbo.tableTranslate tblTrans
        WHERE 
            tblTrans.fieldC = dbo.tableUpdate.fieldC 
            AND 
            tblTrans.fieldD = dbo.tableUpdate.fieldA
)

Answer 1

UPDATE ... FROM语法对Oracle无效.您将需要使用子查询,如下所示:

UPDATE dbo.tableUpdate t
SET t.fieldA = (SELECT tt.fieldB
                FROM dbo.tableTranslate tt
                WHERE tt.fieldC = t.fieldC
                AND tt.fieldD = t.fieldA
               )
WHERE 1 = (
        SELECT COUNT(tblTrans.fieldD) 
        FROM dbo.tableTranslate tblTrans
        WHERE tblTrans.fieldC = t.fieldC 
        AND tblTrans.fieldD = t.fieldA
        )