exact_num_type

exact_num_type 
      ::= 
      "numeric" [ "(" precision [ "," scale ] ")" ] 
      | "decimal" [ "(" precision [ "," scale ] ")" ] 
      | "dec" [ "(" precision [ "," scale ] ")" ] 
      | "integer" 
      | "int" 
      | "smallint" 

This rule is called by

-> num_type