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Posted By

arunpjohny on 10/19/07


Tagged

postgres


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Add a interval to a given date in postgresql

Published in: SQL 

Add a given interval to a date. The intervals can be year, month or day

Plain TextExpand 
  1. CREATE OR REPLACE FUNCTION dateadd(diffType Character Varying(15), incrementValue int, inputDate timestamp) RETURNS timestamp AS $$
  2. DECLARE
  3.    YEAR_CONST Char(15) := 'year';
  4.    MONTH_CONST Char(15) := 'month';
  5.    DAY_CONST Char(15) := 'day';
  6.  
  7.    dateTemp Date;
  8.    intervalValue varchar (100);
  9. BEGIN
  10.       IF lower($1) = lower(YEAR_CONST) THEN
  11.        dateTemp := inputDate +  interval '$2 year';
  12.    ELSEIF lower($1) = lower(MONTH_CONST) THEN
  13.        dateTemp := inputDate +  interval  '$2 months';
  14.    ELSEIF lower($1) = lower(DAY_CONST) THEN
  15.        dateTemp := inputDate +  interval  '$2 day';
  16.    END IF;
  17.  
  18.    RETURN dateTemp;
  19. END;
  20. $$ LANGUAGE plpgsql;

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