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doc: clarify the useful features of procedures
This was not clearly documented when procedures were added in PG 11. Reported-by: Robin Abbi Discussion: https://postgr.es/m/CAGmg_NX327KKVuJmbWZD=pGutYFxzZjX1rU+3ji8UuX=8ONn9Q@mail.gmail.com Backpatch-through: 11
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A procedure is a database object similar to a function. The difference is
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A procedure is a database object similar to a function. The difference is
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that a procedure does not return a value, so there is no return type
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that a procedure does not return a value, so there is no return type
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declaration. While a function is called as part of a query or DML
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declaration. While a function is called as part of a query or DML
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command, a procedure is called explicitly using
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command, a procedure is called in isolation using
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the <xref linkend="sql-call"/> statement.
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the <xref linkend="sql-call"/> command. If the CALL command is not
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part of an explicit transaction, a procedure in many server-side
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languages can commit, rollback, and begin new transactions during
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its execution, which is not possible in functions.
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</para>
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</para>
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<para>
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<para>
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