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How do I write a C function to return a tuple?

April 26, 2017function Return tuple write

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How do I write a C function to return a tuple?

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In versions of PostgreSQL beginning with 7.3, table-returning functions are fully supported in C, PL/PgSQL, and SQL. See the Programmer’s Guide for more information. An example of a table-returning function defined in C can be found in contrib/tablefunc.