如何从函数 postgresql 返回一个在查询中有多个表的表？

Question

我有一个问题，我有一个查询，它有多个表，我想创建一个函数，将该查询作为表返回给我

SELECT mat.codigo as codmatr, mat.codigoalumno as codal, mat.codigoempresa as codemp ,mat.codigopresentacion as codpre,
    mat.codigosecretaria as codsec, mat.fecha as fechamat, mat.estado as estadomat,
    mat.vigencia as vigmat, p.apellidos as apeAl, p.apellidos||' '||p.nombres as nombrecompleto,
    p.nombres as nomAl,razonsocial ,pre.codigocurso as codcur,cur.nombre as curso
    FROM matricula mat join alumno al on mat.codigoalumno = al.codigoalumno
    join persona p on  al.codigoalumno = p.codigo
    join persona pe on mat.codigoalumno = pe.codigo
    left join empresa emp on mat.codigoempresa = emp.codigo
    join presentacion pre on mat.codigopresentacion = pre.codigo
    join curso cur on cur.codigo = pre.codigocurso
    order by nombrecompleto

这是我的查询 这是我的功能

CREATE OR REPLACE FUNCTION fn_lisMatricula() RETURNS SETOF Matricula AS
$BODY$
DECLARE
    r Matricula%rowtype;
r Persona%rowtype;

BEGIN
    FOR r IN SELECT mat.codigo as codmatr, mat.codigoalumno as codal, mat.codigoempresa as codemp ,mat.codigopresentacion as codpre,
    mat.codigosecretaria as codsec, mat.fecha as fechamat, mat.estado as estadomat,
    mat.vigencia as vigmat, p.apellidos as apeAl, p.apellidos||' '||p.nombres as nombrecompleto,
    p.nombres as nomAl,razonsocial ,pre.codigocurso as codcur,cur.nombre as curso
    FROM matricula mat join alumno al on mat.codigoalumno = al.codigoalumno
    join persona p on  al.codigoalumno = p.codigo
    join persona pe on mat.codigoalumno = pe.codigo
    left join empresa emp on mat.codigoempresa = emp.codigo
    join presentacion pre on mat.codigopresentacion = pre.codigo
    join curso cur on cur.codigo = pre.codigocurso
    order by nombrecompleto
    LOOP       
        RETURN NEXT r;
    END LOOP;
    RETURN;
END
$BODY$
LANGUAGE 'plpgsql';

select * from fn_lisMatricula()

问题是函数的结果只有我的“矩阵”表的结构，但我想要所有查询结果的结构。

Answer 1

使用RETURNS TABLE 并指定结果列类型和名称。请参阅the PostgreSQL documentation for PL/PgSQL 和CREATE FUNCTION。

或者，您可以：

• CREATE TYPE 为目的自定义复合类型并返回 SETOF 它；
• 使用OUT参数和RETURNS SETOF RECORD，
• 调用函数时使用RETURNS SETOF RECORD并指定结果记录结构

RETURNS TABLE(...) 是迄今为止最简单的选择。