Postgresql: EXECUTE sql_cmd merge with CREATE TEMP TABLE temp_tbl AS SELECT

Question

Soo, here is the thing, I am using in my DB methods 2 approaches:

1.) Is compose and SQL query from various string, depending on what I need to filter out:

sql_cmd := 'SELECT count(*) FROM art_short_term_finished WHERE (entry_time <= ''' || timestamp_up || ''' AND exit_time >= ''' || timestamp_down || ''') AND ' ||  time_filter || ' AND entry_zone = ' || zone_parameter || ' AND park_uuid = ' || park_id_p || '';
EXECUTE sql_cmd INTO shortterm_counter;

2.) Copy part of the big table, into smaller temp table and work with it:

    -- Get the data from FPL into smaller table for processing
    DROP TABLE IF EXISTS temp_fpl_filtered;
    CREATE TEMP TABLE temp_fpl_filtered AS SELECT car_id FROM flexcore_passing_log fpl WHERE fpl.zone_leaved = '0' AND fpl.status IN (SELECT status_id FROM fpl_ok_statuses) AND fpl.park_uuid = park_id_p AND (fpl.datetime BETWEEN row_i.start_d AND row_i.end_d);

But what If I want to mix those two?

I want to have the SELECT after CREATE TEMP TABLE temp_fpl_filtered AS to have different WHERE clauses depending on input parameters of stored procedure, without having to write the same statement xy times in one stored procedure.

But my approach:

-- art class is shortterm, check shortterm history
IF art_class_p = 1 OR article_p = 0 THEN
  -- create temporary table derivated from shortterm history
  IF article_p = 0 THEN
    article_p_filter := '';
  ELSE
    article_p_filter := ' AND article_id = ' || article_p;
  END IF;

  short_cmd := 'SELECT car_id, article_id, entry_time, exit_time FROM art_short_term_finished WHERE zone_leaved = ''0'' AND status IN (SELECT status_id FROM fpl_ok_statuses) ''' || article_p_filter || ''' AND park_uuid = ''' || park_id_p || ''' AND (entry_time <= ''' || timestamp_up || ''' AND exit_time >= ''' || timestamp_down || ''')'; 

  DROP TABLE IF EXISTS temp_short_full;
  CREATE TEMP TABLE temp_short_full AS short_cmd;
  --EXECUTE sql_cmd INTO shortterm_counter;
END IF;

throws me an exception when I try to inser stored procedure:

psql:report_parking_average.sql:107: ERROR:  syntax error at or near "short_cmd"
LINE 50:       CREATE TEMP TABLE temp_fpl_filtered AS short_cmd;
                                                      ^

Also, the another try:

EXECUTE short_cmd INTO TEMP TABLE temp_short_full;

is not working..

user330315 · Accepted Answer · 2018-09-10 14:56:06Z

2

You need to include the CREATE TABLE part into the SQL you generate:

short_cmd := 'CREATE TEMP TABLE temp_short_full AS SELECT car_id, article_id, entry_time, exit_time FROM art_short_term_finished WHERE zone_leaved = ''0'' AND status IN (SELECT status_id FROM fpl_ok_statuses) ''' || article_p_filter || ''' AND park_uuid = ''' || park_id_p || ''' AND (entry_time <= ''' || timestamp_up || ''' AND exit_time >= ''' || timestamp_down || ''')'; 

DROP TABLE IF EXISTS temp_short_full;
execute short_cmd;

answered Sep 10, 2018 at 14:56

user330315

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