Question 193167 in PostgreSQL Question posted in
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why case statement with double precision in postgresql error?

I’m having problems with the case statement in PostgreSQL. Here I want to change the output of the month (number) to text, like January, February, etc.

select
    date_part('month', tanggal) bulan,
    case 
         when date_part('month', tanggal)= 1 then 'January'
         when date_part('month', tanggal) = 2 then 'February'
         when date_part('month', tanggal) = 3 then 'March'
         when date_part('month', tanggal) = 4 then 'April'
         when date_part('month', tanggal) = 5 then 'May'
         when date_part('month', tanggal) = 6 then 'June'
         when date_part('month', tanggal) = 7 then 'July'
         when date_part('month', tanggal) = 8 then 'August'
         when date_part('month', tanggal) = 9 then 'September'
         when date_part('month', tanggal) = 10 then 'October'
         when date_part('month', tanggal) = 11 then 'November'
         when date_part('month', tanggal) = 12 then 'December'
         else date_part('month', tanggal)
    end as namabulan

But, what I got was an error like this

ERROR:  invalid input syntax for type double precision: "Januari"
LINE 4:    when date_part('month', tanggal)= 1 then 'Januari'
                                                    ^

I was trying with a changed data type in the case statement ‘January’, but I got an error with the statement not matching with double precision.

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2

Answers


  1. 0

    The literals all have type ‘unknown’, leaving the ELSE to determine the return type of the CASE. But then the literals can’t be interpreted as being of that type.

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  2. 0

    This will return the name of the month without the CASE statement:

    SELECT
     current_timestamp, to_char(current_timestamp,'Month') MonthName;

    see: DBFIDDLE, which also shows how to fix the problem in your CASE statement.

    and documentation of postgresql: full mixed-case month name (blank-padded to 9 chars)

    NOTE: When you do not want 9 characters, you can always use rtrim()

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