postgres if else example

Example 1: postgres if else

DO $$
DECLARE
  a integer := 10;
  b integer := 20;
BEGIN 
  IF a > b THEN
	RAISE NOTICE 'a is greater than b';
  END IF;

  IF a < b THEN
	RAISE NOTICE 'a is less than b';
  END IF;

  IF a = b THEN
	RAISE NOTICE 'a is equal to b';
  END IF;
END $$;

Example 2: postgress if

-- use postgress case

SELECT name, continent, indep_year,
    CASE WHEN indep_year < 1900 THEN 'before 1900'
         WHEN indep_year <= 1930 THEN 'between 1900 and 1930'
         ELSE 'after 1930' END
         AS indep_year_group
FROM countries
ORDER BY indep_year_group;

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Misc Example

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