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spec: The rule system will rewrite the SELECT from phone_number into a SELECT from phone_data and add the qualification that only entries where private is false are wanted . The Postgres rule system changes the behaviour of the default access control system . This uses a generic mechanism which supports the type extensibility features of Postgres . How Was It Formed ? Someone might think that this rule by rule checking is a security hole , but in fact it is n't . To learn more about scholarly journals and popular publications , see Distinguishing Scholarly Research Journals from Other Periodicals . 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 . '' `` We agonized over that . The Postgres Rule SystemNextRules versus Triggers Many things that can be done using triggers can also be implemented using the Postgres rule system . The rule system stores the rule text and query plans as text attributes . Foreign lawyers must belong to foreign-Japanese joint ventures that have both foreign and local lawyers . We shall have more to say about so-called dangerous drugs in later chapters . Ideas and quotations that come from others should be properly footnoted . They only made things worse , though . He said there were some interesting people in Paris who had different specializations . Among other things , this means that functions of instances ( e.g ., foo ( emp ) where emp is a class ) cannot be called anywhere in a rule . '' One , I 'd like to be alive .