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Each of the source systems may store its data in completely different format from the rest.
The data transformation may include various operations including but not limited to filtering, sorting, aggregating, joining data, cleaning data, generating calculated data based on existing values, validating data, etc.
The ESCAPE clause specifies the escape character used in the query (it can be any character).
A common example would be as follows: In this case, the escape character is the backslash (\).
Because all PL/SQL parameters are defined with a fixed data type, only text (VARCHAR) parameters can be vulnerable.
Consequently, they are the only parameters that must be validated. Oracle only uses two wildcards; characters “%” and “_”.