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A DELETE on a view , with a subselect qualification that in total uses 4 nesting / joined views , where one of them itself has a subselect qualification containing a view and where calculated view columns are used , gets rewritten into one single parsetree that deletes the requested data from a real table . " In addition to being a terrific toy , the Slinky is an excellent device for demonstrating various properties of physics . He also wrote a chapter on it for the Programmer 's Guide.Jan also contributed a second procedural language , PL / pgSQL , to go with the original PL / pgTCL procedural language he contributed last release.We have optional multiple-byte character set support from Tatsuo Iishi to complement our existing locale support.Client / server communications has been cleaned up , with better support for asynchronous messages and interrupts thanks to Tom Lane.The parser will now perform automatic type coersion to match arguments to available operators and functions , and to match columns and expressions with target columns . If this keyword is omitted when registering the language , only users with the Postgres superuser privilege can use this language to create new functions ( like the ' C ' language ) . In this situation it is best not to try to overload SQL function names .