missing keyword error in oracle CASE WHEN sql statement

Question

I am writing a procedure in which i have sql statement which will insert values in TEMP_WF_WORKFLOW table using CASE WHEN statement. The condition is when STATUS_ID is 0 then the EVENT_ID=10003 and when STATUS_ID is 1 then EVETN_ID=10018. When i try to use CASE WHEN for this its giving me error missing keyword.I dont know but is there any other way to do this if not using CASE WHEN statement. I am thinking about using cursor but dont know how to do this.

Here is my query:

CREATE OR REPLACE PROCEDURE ext_self_10003_sigwf AS BEGIN       
    -- first empty TEMP_WF_WORKFLOW table
    EXECUTE IMMEDIATE 'TRUNCATE TABLE TEMP_WF_WORKFLOW';

    -- get WF_WORKFLOW table data 
    INSERT INTO temp_wf_workflow (status_id, event_id, order_number)
      SELECT
        wf.status_id,
        CASE WHEN wf.status_id = 0 THEN event_id = 10003
        WHEN wf.status_id = 1 THEN event_id = 10018 END AS eventid,
        tsm.order_number 
       FROM wf_workflow@fonic_retail wf
        JOIN tmp_soap_monitoring_ids tsm ON tsm.subscription_id = wf.subscription_id
       WHERE tsm.order_type = 'SELF_REGISTRATION' AND wf.name = 'SIGNUP_MOBILE_PRE_PAID';

    COMMIT;

  END ext_self_10003_sigwf;

Answer 1

 CASE EVENT_ID WHEN WF.STATUS_ID=0 THEN EVENT_ID=10003 
    WHEN WF.STATUS_ID=1 THEN EVENT_ID=10018 END AS EVENTID

You have mixed two different syntax of CASE statement.

1.simple_case_statement

   CASE [ expression ]

   WHEN condition_1 THEN result_1
   WHEN condition_2 THEN result_2
   ...
   WHEN condition_n THEN result_n

   ELSE result

   END

2.searched_case_statement

CASE 

   WHEN expression condition_1 THEN result_1
   WHEN expression condition_2 THEN result_2
   ...
   WHEN expression condition_n THEN result_n

   ELSE result

END 

Change your expression to -

CASE 
   WHEN WF.STATUS_ID=0 THEN 10003 
   WHEN WF.STATUS_ID=1 THEN 10018
END AS EVENTID

Follow this link to see the documentation for both the syntax.

Update OP says he still gets the missing keyword error. This is a test case to show it is not true. The missing keyword will be fixed with correct CASE statement.

SQL> CREATE OR REPLACE
  2  PROCEDURE EXT_SELF_10003_SIGWF
  3  AS
  4  BEGIN
  5    -- first empty TEMP_WF_WORKFLOW table
  6    EXECUTE IMMEDIATE 'TRUNCATE TABLE TEMP_WF_WORKFLOW';
  7    -- get WF_WORKFLOW table data
  8    INSERT
  9    INTO TEMP_WF_WORKFLOW
 10      (
 11        STATUS_ID,
 12        EVENT_ID,
 13        ORDER_NUMBER
 14      )
 15    SELECT WF.STATUS_ID,
 16      CASE
 17        WHEN WF.STATUS_ID=0
 18        THEN 10003
 19        WHEN WF.STATUS_ID=1
 20        THEN 10018
 21      END AS EVENTID,
 22      TSM.ORDER_NUMBER
 23    FROM WF_WORKFLOW@FONIC_RETAIL WF
 24    JOIN TMP_SOAP_MONITORING_IDS TSM
 25    ON TSM.SUBSCRIPTION_ID=WF.SUBSCRIPTION_ID
 26    WHERE TSM.order_type  ='SELF_REGISTRATION'
 27    AND WF.NAME           ='SIGNUP_MOBILE_PRE_PAID';
 28    COMMIT;
 29  END EXT_SELF_10003_SIGWF;
 30  /

Warning: Procedure created with compilation errors.

SQL> sho err
Errors for PROCEDURE EXT_SELF_10003_SIGWF:

LINE/COL ERROR
-------- --------------------------------------------------
7/3      PL/SQL: SQL Statement ignored
23/8     PL/SQL: ORA-00942: table or view does not exist
SQL>

Answer 2

insert in THEN only value

CASE WHEN WF.STATUS_ID=0 THEN 10003 
WHEN WF.STATUS_ID=1 THEN 10018 END

Answer 3

Remove EVENT_ID from within the CASE:

...
CASE -- EVENT_ID
   WHEN WF.STATUS_ID=0 THEN 10003 
   WHEN WF.STATUS_ID=1 THEN 10018
END AS EVENTID
...

CASE takes two forms:

CASE
    WHEN <condition> THEN <value>
    WHEN <condition> THEN <value> -- etc
    ELSE <default value> -- optional
END

Or

CASE <value source>
    WHEN <match value> THEN <result value>
    WHEN <match value> THEN <result value> -- etc
    ELSE <default value> -- optional
END

Answer 4

Case statement is implemented incorrectly. You can use case in two ways: 1)

Case <some_variable or column_name> 
  When <value1> then <return_value>
else
  <return_value>
end;

2)

    Case 
      When <logical_stamtement (e.g. value1=0 or column1=0)> then <return_value>
    else
      <return_value>
    end

In your program you have used both of them simultaneously. Correct code should be

create or replace PROCEDURE EXT_SELF_10003_SIGWF AS 

    BEGIN

    -- first empty TEMP_WF_WORKFLOW table
    EXECUTE IMMEDIATE 'TRUNCATE TABLE TEMP_WF_WORKFLOW'; 


    -- get WF_WORKFLOW table data 
    Insert into TEMP_WF_WORKFLOW(STATUS_ID,EVENT_ID,ORDER_NUMBER)
    Select WF.STATUS_ID,
    CASE WHEN WF.STATUS_ID=0 THEN 10003 
    WHEN WF.STATUS_ID=1 THEN 10018 END AS EVENTID
    ,TSM.ORDER_NUMBER FROM WF_WORKFLOW@FONIC_RETAIL WF 
    where WF.NAME='SIGNUP_MOBILE_PRE_PAID';

    commit;

    END EXT_SELF_10003_SIGWF;