PostgreSQL - Format() Named parameters?












0















I have the following function that takes a table name as parameter and returns the table:



CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
col text,
col2 text
) AS $$
BEGIN
RETURN QUERY
EXECUTE format('SELECT * FROM %I', tab_name);
END;
$$
LANGUAGE plpgsql;


Suppose instead, I wanted to do return the table 100 times:



CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
col text,
col2 text
) AS $$
BEGIN
RETURN QUERY
EXECUTE format('
SELECT * FROM %I
UNION ALL
SELECT * FROM %I,
UNION ALL
SELECT * FROM %I
......
', tab_name, tab_name, tab_name,.....);
END;
$$
LANGUAGE plpgsql;


Instead of putting tab_name 100 times is there some way to use named parameters?










share|improve this question



























    0















    I have the following function that takes a table name as parameter and returns the table:



    CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
    col text,
    col2 text
    ) AS $$
    BEGIN
    RETURN QUERY
    EXECUTE format('SELECT * FROM %I', tab_name);
    END;
    $$
    LANGUAGE plpgsql;


    Suppose instead, I wanted to do return the table 100 times:



    CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
    col text,
    col2 text
    ) AS $$
    BEGIN
    RETURN QUERY
    EXECUTE format('
    SELECT * FROM %I
    UNION ALL
    SELECT * FROM %I,
    UNION ALL
    SELECT * FROM %I
    ......
    ', tab_name, tab_name, tab_name,.....);
    END;
    $$
    LANGUAGE plpgsql;


    Instead of putting tab_name 100 times is there some way to use named parameters?










    share|improve this question

























      0












      0








      0








      I have the following function that takes a table name as parameter and returns the table:



      CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
      col text,
      col2 text
      ) AS $$
      BEGIN
      RETURN QUERY
      EXECUTE format('SELECT * FROM %I', tab_name);
      END;
      $$
      LANGUAGE plpgsql;


      Suppose instead, I wanted to do return the table 100 times:



      CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
      col text,
      col2 text
      ) AS $$
      BEGIN
      RETURN QUERY
      EXECUTE format('
      SELECT * FROM %I
      UNION ALL
      SELECT * FROM %I,
      UNION ALL
      SELECT * FROM %I
      ......
      ', tab_name, tab_name, tab_name,.....);
      END;
      $$
      LANGUAGE plpgsql;


      Instead of putting tab_name 100 times is there some way to use named parameters?










      share|improve this question














      I have the following function that takes a table name as parameter and returns the table:



      CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
      col text,
      col2 text
      ) AS $$
      BEGIN
      RETURN QUERY
      EXECUTE format('SELECT * FROM %I', tab_name);
      END;
      $$
      LANGUAGE plpgsql;


      Suppose instead, I wanted to do return the table 100 times:



      CREATE FUNCTION func(tab_name varchar) RETURNS TABLE (
      col text,
      col2 text
      ) AS $$
      BEGIN
      RETURN QUERY
      EXECUTE format('
      SELECT * FROM %I
      UNION ALL
      SELECT * FROM %I,
      UNION ALL
      SELECT * FROM %I
      ......
      ', tab_name, tab_name, tab_name,.....);
      END;
      $$
      LANGUAGE plpgsql;


      Instead of putting tab_name 100 times is there some way to use named parameters?







      sql database postgresql






      share|improve this question













      share|improve this question











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      asked Nov 23 '18 at 0:09









      Legend123Legend123

      2915




      2915
























          1 Answer
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          You can indicate the position of an argument and use an argument multiple times, e.g.



          select format('%2$s - %1$s - %2$s', 'first', 'second');

          format
          -------------------------
          second - first - second
          (1 row)


          Read more in the documentation.






          share|improve this answer























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            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            3














            You can indicate the position of an argument and use an argument multiple times, e.g.



            select format('%2$s - %1$s - %2$s', 'first', 'second');

            format
            -------------------------
            second - first - second
            (1 row)


            Read more in the documentation.






            share|improve this answer




























              3














              You can indicate the position of an argument and use an argument multiple times, e.g.



              select format('%2$s - %1$s - %2$s', 'first', 'second');

              format
              -------------------------
              second - first - second
              (1 row)


              Read more in the documentation.






              share|improve this answer


























                3












                3








                3







                You can indicate the position of an argument and use an argument multiple times, e.g.



                select format('%2$s - %1$s - %2$s', 'first', 'second');

                format
                -------------------------
                second - first - second
                (1 row)


                Read more in the documentation.






                share|improve this answer













                You can indicate the position of an argument and use an argument multiple times, e.g.



                select format('%2$s - %1$s - %2$s', 'first', 'second');

                format
                -------------------------
                second - first - second
                (1 row)


                Read more in the documentation.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 23 '18 at 0:36









                klinklin

                57.9k65080




                57.9k65080






























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