Im trying to check for a column[EMPID] in a table [EMPLOYEE] if exist i have to consider the values from that column, if not it have to refer to another TAble[Details] and column[EMPID]. Please somebody can answer this. Im trying to check for a column[EMPID] in a tab
阅读背景：
查找表中的列并拉出值（如果存在）则引用其他列
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