QUERY: SELECT '' AS "One",
  CASE
    WHEN 1 < 2 THEN 3
  END AS "One only = 3";
One|One only = 3
---+------------
   |           3
(1 row)

QUERY: SELECT '' AS "One",
  CASE
    WHEN 1 > 2 THEN 3
  END AS "One only = Null";
One|One only = Null
---+---------------
   |               
(1 row)

QUERY: SELECT '' AS "One",
  CASE
    WHEN 1 < 2 THEN 3
    ELSE 4
  END AS "One with default = 3";
One|One with default = 3
---+--------------------
   |                   3
(1 row)

QUERY: SELECT '' AS "One",
  CASE
    WHEN 1 > 2 THEN 3
    ELSE 4
  END AS "One with default = 4";
One|One with default = 4
---+--------------------
   |                   4
(1 row)

QUERY: SELECT '' AS "One",
  CASE
    WHEN 1 > 2 THEN 3
    WHEN 4 < 5 THEN 6
    ELSE 7
  END AS "Two with default = 6";
One|Two with default = 6
---+--------------------
   |                   6
(1 row)

QUERY: SELECT '' AS "Five",
  CASE
    WHEN f1 >= 0 THEN f1
  END AS ">= 0 or Null"
  FROM INT4_TBL;
Five|>= 0 or Null
----+------------
    |           0
    |      123456
    |            
    |  2147483647
    |            
(5 rows)

QUERY: SELECT '' AS "Five",
  CASE WHEN f1 >= 0 THEN (f1 - f1)
       ELSE f1
  END AS "Simplest Math"
  FROM INT4_TBL;
Five|Simplest Math
----+-------------
    |            0
    |            0
    |      -123456
    |            0
    |  -2147483647
(5 rows)

QUERY: SELECT '' AS "Five", f1 AS "Value",
  CASE WHEN (f1 < 0) THEN 'small'
       WHEN (f1 = 0) THEN 'zero'
       WHEN (f1 = 1) THEN 'one'
       WHEN (f1 = 2) THEN 'two'
       ELSE 'big'
  END AS "Category"
  FROM INT4_TBL;
Five|      Value|Category
----+-----------+--------
    |          0|zero    
    |     123456|big     
    |    -123456|small   
    | 2147483647|big     
    |-2147483647|small   
(5 rows)

