SQL - how to sort and filter a certain number of courses by using a setting

Hello I am using Oracle 11 g 2 SQL in TOAD Version 11.5.1.1.2 editor

I try to view all course numbers for my classroom that has the following conditions: only if the user specifies the code "adg" in parameter: programcode otherwise it will show all courses.

##A###
##C###
##N###
##Q###

Where the third character of my number of course must be a (A, C, N, Q).

However, I get the following error [error] performance (71:39): ORA-00907: lack the right parenthesis

Select course_number
classroom
where course_number = (case when: programcode is null then to another course_number (case when: programcode as 'adg' then))
(course_number LIKE '__Une %' OR)
course_number LIKE '% __C' OR
course_number LIKE '% __N' OR
course_number LIKE '% __Q') ELSE NULL END END))


Help will be greatly appreciated... Thank you!

Hello

That's what you asked for:

SELECT  course_number
FROM      classroom
WHERE      NVL (:programcode, 'ok')     != 'adg'
OR     SUBSTR (course_number, 3, 1)     IN ('A', 'C', 'N', 'Q')
;

If you are intersested in what caused the error in the code you posted, it helps to format your code, while each "(" s'aligne sur sa droite de correspondance") left ', each CASE is aligned with its corresponding END and so forth:"

Select  course_number
from      classroom
where      course_number = (
                       case
                           when  :programcode is null
                     then  course_number
                     else (
                               case
                                   when :programcode like 'adg'          -- No point in using LIKE without a wild card
                               then (
                                    course_number LIKE '__A%' OR     -- What value is this?
                                           course_number LIKE '__C%' OR
                                     course_number LIKE '__N%' OR
                                     course_number LIKE '__Q%'
                               )
                          ELSE NULL
                         END
                 END                -- This should be a line later
                          )      -- This should be a line earlier
                  )

If you would care to post some sample data (CREATE TABLE and INSERT and something instructions for: programcode) then I could test it.

The error was caused by the evil place ")" towards the end of the month. The outside CASE keyword was within 1 pair of parentheses, but its corresponding END was within 2 games.
If you have solved that, you would get another error because of the inner CASE expression. Remember, each WHEN clause has to return a value in one of the types of SQL, such as NUMBER or VARCHAR2 data. What is the value in this data type SQL is returned by internally WHEN?

Tags: Database

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