teradata - Comparing two fileds in select command -

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i trying select records transaction_table tr_amount = instrument_number using following code 

select * transaction_table abs(tr_amount) = cast(instrument_number integer)

however there rows in table instrument_number alphanumeric instead of numeric data. there way skip alphanumeric instances in instrument_number field in command.

switch to_number, returns null bad data:

select * transaction_table abs(tr_amount) = to_number(instrument_number)

td15.10 implements trycast:

select * transaction_table abs(tr_amount) = try_cast(instrument_number integer)

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