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v5.0
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    v5.0

      CASE

      Function CASE calculates a new value from one or multiple values based on conditions. Once the condition of a WHEN is met, the value in the correspondent THEN is generated, and the rest of WHEN and ELSE will be skipped.

      case
        when <condition> then <output>
        when <condition> then <output>
        ...
        else <otherOutput>
      end
      

      case <expression>
        when <value> then <output>
        when <value> then <output>
        ...
        else <otherOutput>
      end
      
      • <output> is the value to generate when <condition> is met (Syntax 1), or when <expression> equals <value> (Syntax 2)
      • <otherOutput> is the value to generate when none of the conditions is met; a default value will be generated when ELSE is absent, which has same data format with <output>

      Keywords CASE, WHEN, THEN, ELSE, END are all case insensitive.

      The condition statements (WHEN) are executed from top to bottom in sequence. When a condition is met, the corresponding output (THEN) is executed, and the remaining conditional statements are not executed.

      Common Usage

      Example: Calculate the day of week of the planned payday (15th) of each month in 2023

      uncollect ["2023-1-15","2023-2-15","2023-3-15","2023-4-15","2023-5-15","2023-6-15","2023-7-15","2023-8-15","2023-9-15","2023-10-15","2023-11-15","2023-12-15"] as payday
      return CASE dayOfWeek(payday)
      when 1 then "Sunday"
      when 2 then "Monday"
      when 3 then "Tuesday"
      when 4 then "Wednesday"
      when 5 then "Thursday"
      when 6 then "Friday"
      when 7 then "Saturday"
      END
      

      Sunday
      Wednesday
      Wednesday
      Saturday
      Monday
      Thursday
      Saturday
      Tuesday
      Friday
      Sunday
      Wednesday
      Friday
      

      Example: Calculate the actual payday of each month in 2023, knowing that a planned payday in the weekend should be postponded to the following Monday

      uncollect ["2023-1-15","2023-2-15","2023-3-15","2023-4-15","2023-5-15","2023-6-15","2023-7-15","2023-8-15","2023-9-15","2023-10-15","2023-11-15","2023-12-15"] as payday
      return CASE dayOfWeek(payday)
      when 1 then dateAdd(payday, 1, "day")
      when 7 then dateAdd(payday, 2, "day")
      else dateAdd(payday, 0, "day")
      END
      

      Analysis: Function dateAdd() in WHEN shifts the planned payday from weekend to the following Monday; ELSE indicates the paydays that are during working days, but still need the payday to be 0-shifted by dateAdd(), the reason is to keep the output data format of ELSE in consistent with WHEN.

      2023-01-16 00:00:00
      2023-02-15 00:00:00
      2023-03-15 00:00:00
      2023-04-17 00:00:00
      2023-05-15 00:00:00
      2023-06-15 00:00:00
      2023-07-17 00:00:00
      2023-08-15 00:00:00
      2023-09-15 00:00:00
      2023-10-16 00:00:00
      2023-11-15 00:00:00
      2023-12-15 00:00:00
      
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