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If this would not work , the secretary could setup a table with the same columns as phone_number and copy the data to there once per day . Arguments to the SQL function may be referenced in the queries using a $ n syntax : $ 1 refers to the first argument , $ 2 to the second , and so on . In fact , logical equality is not good enough either ; the operator had better represent pure bitwise equality , because the hash function will be computed on the memory representation of the values regardless of what the bits mean . Since data is stored natively in binary format , the system must do a conversion to produce the text format . Only a rule will help . DROP FUNCTION will remove references to an existing C function . A function may also have the same name as an attribute .