Display Null when the column has a particular date value

Experts,
I have write the below query in Date column,
CASE WHEN Table.Column='Bad A'
THEN CAST(Null as "Table"."Date")
WHEN Table.Column='Bad b'
THEN CAST(Null as "Table"."Date")
ELSE "Table"."Date"END
but I am getting *" Invalid Alias Format : Table_name.Column_name required"*
Please let me know where I did mistake.
Thanks in Advance.
Thanks,
Balaa...

Is that Table withe data column that you are using to replace the values in the main column using the case statement is an alias table or physical table? If it is alias table, you might want to try to use physical table instead.
Thanks,
-Amith

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