Question

Postgresql replace codes with descriptions

Asked by: mvalencia

I have a select statement that returns a single row for each record as expected but one of the columns contains comma separated codes and I need to replace the codes in the column with comma separated descriptions. I do have a table that shows descriptions for the codes but don't know how to replace the codes and maintain the number of columns and single row per stock record.

Here is a sample of the results:
"L090434","N",",995,925,946," 

SELECT  stocknumber,  inventorystatus,  options
 FROM   stock  LEFT OUTER JOIN vehicleoptions ON vehicleoptions.option_cd = stock.options

                                  
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Asked On
2009-10-19 at 14:39:14ID24825199
Tags

comma seperated codes

,

replace with descriptions

Topic

PostgreSQL Database

Participating Experts
1
Points
500
Comments
9

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Answers

 

by: earthman2Posted on 2009-10-20 at 04:13:37ID: 25612847

you could use some fancy SQL functions using string_to_array, unnest and aggregate functions but something like the following (untested) should suffice.

create or replace function decode_options( o text ) returns text as $$
declare
  i int := 1;
  r text := '';
  a anyarray := string_to_array( o, ',' );
  m int := array_ndims( a );
begin
  loop
    if ( a[i] <> '' ) then
      if ( r = '' ) then
        r := ( select full_code from option_table where option_table.code = a[i] );
      else
        r := r || ',' || ( select full_code from option_table where option_table.code = a[i] );
      end if;
    end if;
    i := i + 1;
    exit when i > m;
  end loop;
  return r;
end;
$$ language plpgsql;

SELECT  stocknumber,  inventorystatus,  decode_options( options )
 FROM   stock  LEFT OUTER JOIN vehicleoptions ON vehicleoptions.option_cd = stock.options

 

 

by: mvalenciaPosted on 2009-10-20 at 08:08:29ID: 25614954

When I attempt to create a new functions using the above code I get this:
ERROR: syntax error at or newr "BODY&DECLARE
  i int := 1;
  r text := '';
  a anyarray := string_to_array( o, ',' );
  m int := array_ndims( a );
begin
  loop
    if ( a[i] <> '' ) then
      if ( r = '' ) then
        r := ( select full_code from option_table where option_table.code = a[i] );
      else
        r := r || ',' || ( select full_code from option_table where option_table.code = a[i] );
      end if;
    end if;
    i := i + 1;
    exit when i > m;
  end loop;
  return r;
end;
$$ language plpgsql;

SELECT  stocknumber,  inventorystatus,  decode_options( options )
 FROM   stock  LEFT OUTER JOIN vehicleoptions ON vehicleoptions.option_cd = stock.options&BODY&" at character 84


 

 

by: earthman2Posted on 2009-10-20 at 13:07:53ID: 25617997

treacle=> create or replace function decode_options( o text ) returns text as $$
treacle$> declare
treacle$>   i int := 1;
treacle$>   x text;
treacle$>   r text := '';
treacle$>   a text[] := string_to_array( o, ',' );
treacle$>   m int := array_upper( a, 1 );
treacle$> begin
treacle$>   loop
treacle$>     if a[i] <> '' then
treacle$>       select full_code into x from option_table where option_table.code = a[i];
treacle$>       if r = ''  then
treacle$>         r := x;
treacle$>       else
treacle$>         r := r || ',' || x;
treacle$>       end if;
treacle$>     end if;
treacle$>     i := i + 1;
treacle$>     exit when i > m;
treacle$>   end loop;
treacle$>   return r;
treacle$> end;
treacle$> $$ language plpgsql;
CREATE FUNCTION

treacle=> select * from option_table;
 code | full_code
------+-----------
  995 | This
  925 | Code
  946 | Works
(3 rows)

treacle=> select decode_options( ',995,925,946' );
 decode_options
-----------------
 This,Code,Works
(1 row)

 

by: mvalenciaPosted on 2009-10-23 at 15:49:46ID: 25649435

This is what I get when I attempt to execute:

15:46:01  [TREACLE=> - 0 row(s), 0.000 secs]  [Error Code: 32, SQL State: 07002]  The # of binded parameters < the # of parameter markers
... 1 statement(s) executed, 0 row(s) affected, exec/fetch time: 0.000/0.000 sec [0 successful, 0 warnings, 1 errors]

 

by: earthman2Posted on 2009-10-24 at 12:36:53ID: 25653890

it seems you are prone to cut and pasting anything.

try.

create or replace function decode_options( o text ) returns text as $$
declare
   i int := 1;  
   x text;
   r text := '';
  a text[] := string_to_array( o, ',' );
   m int := array_upper( a, 1 );
 begin
   loop
     if a[i] <> '' then
       select full_code into x from option_table where option_table.code = a[i];
       if r = ''  then
         r := x;
       else
         r := r || ',' || x;
       end if;
     end if;
     i := i + 1;
     exit when i > m;
   end loop;
   return r;
 end;
 $$ language plpgsql;

select * from option_table;

 

by: mvalenciaPosted on 2009-10-26 at 08:24:28ID: 25663176

I did copy and past. Here is what this last attempt gave me:

  [CREATE - 0 row(s), 0.000 secs]  [Error Code: 32, SQL State: 07002]  The # of binded parameters < the # of parameter markers

I am executing this in DBVisualizer and the database is Postgresql version 8.2

 

by: earthman2Posted on 2009-10-27 at 15:25:27ID: 25678353

The version I have tested this on is 8.2.4

 

by: mvalenciaPosted on 2009-10-28 at 15:33:56ID: 25689000

awesome job...works like a champ. Thanks,

20120131-EE-VQP-002

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