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>9.21. Set Returning Functions</A
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>   This section describes functions that possibly return more than one row.
   Currently the only functions in this class are series generating functions,
   as detailed in <A
HREF="functions-srf.html#FUNCTIONS-SRF-SERIES"
>Table 9-43</A
>.
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><B
>Table 9-43. Series Generating Functions</B
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>Function</TH
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>Argument Type</TH
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>Return Type</TH
><TH
>Description</TH
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><TR
><TD
><TT
CLASS="LITERAL"
><CODE
CLASS="FUNCTION"
>generate_series</CODE
>(<TT
CLASS="PARAMETER"
>start</TT
>, <TT
CLASS="PARAMETER"
>stop</TT
>)</TT
></TD
><TD
><TT
CLASS="TYPE"
>int</TT
> or <TT
CLASS="TYPE"
>bigint</TT
></TD
><TD
><TT
CLASS="TYPE"
>setof int</TT
> or <TT
CLASS="TYPE"
>setof bigint</TT
> (same as argument type)</TD
><TD
>       Generate a series of values, from <TT
CLASS="PARAMETER"
>start</TT
> to <TT
CLASS="PARAMETER"
>stop</TT
>
       with a step size of one
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
><CODE
CLASS="FUNCTION"
>generate_series</CODE
>(<TT
CLASS="PARAMETER"
>start</TT
>, <TT
CLASS="PARAMETER"
>stop</TT
>, <TT
CLASS="PARAMETER"
>step</TT
>)</TT
></TD
><TD
><TT
CLASS="TYPE"
>int</TT
> or <TT
CLASS="TYPE"
>bigint</TT
></TD
><TD
><TT
CLASS="TYPE"
>setof int</TT
> or <TT
CLASS="TYPE"
>setof bigint</TT
> (same as argument type)</TD
><TD
>       Generate a series of values, from <TT
CLASS="PARAMETER"
>start</TT
> to <TT
CLASS="PARAMETER"
>stop</TT
>
       with a step size of <TT
CLASS="PARAMETER"
>step</TT
>
      </TD
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><P
>   When <TT
CLASS="PARAMETER"
>step</TT
> is positive, zero rows are returned if
   <TT
CLASS="PARAMETER"
>start</TT
> is greater than <TT
CLASS="PARAMETER"
>stop</TT
>.
   Conversely, when <TT
CLASS="PARAMETER"
>step</TT
> is negative, zero rows are
   returned if <TT
CLASS="PARAMETER"
>start</TT
> is less than <TT
CLASS="PARAMETER"
>stop</TT
>.
   Zero rows are also returned for <TT
CLASS="LITERAL"
>NULL</TT
> inputs. It is an error
   for <TT
CLASS="PARAMETER"
>step</TT
> to be zero. Some examples follow:
</P><PRE
CLASS="PROGRAMLISTING"
>select * from generate_series(2,4);
 generate_series
-----------------
               2
               3
               4
(3 rows)

select * from generate_series(5,1,-2);
 generate_series
-----------------
               5
               3
               1
(3 rows)

select * from generate_series(4,3);
 generate_series
-----------------
(0 rows)

select current_date + s.a as dates from generate_series(0,14,7) as s(a);
   dates
------------
 2004-02-05
 2004-02-12
 2004-02-19
(3 rows)</PRE
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