PL/SQL Process Error

Question

Hello All,
I am creating my first PL/SQL Process in APEX and I am having some issues. The Code is as follows:
DECLARE
a INT;
BEGIN
Select ON_TRACK_NUM INTO a from TBL_CMR_TRIAL Where PK_TRIAL = 2;
IF a=1 THEN UPDATE TBL_CMR_PROJECT
SET ON_TRACK = 'Yes'
WHERE PK_PROJECT = :P4_FK1_PROJECT;
ELSEIF a=0 THEN UPDATE TBL_CMR_PROJECT
SET ON_TRACK = 'No'
WHERE PK_PROJECT = :P4_FK1_PROJECT;
END IF;
END;
I have larger plans for this code but this is the first step where I have hard coded in the number 2. Pretty much it is supposed to look at the ON_TRACK_NUM field for this particular row and if it is 1 change another field in another table to Yes or if 0 then No.
The errors I am getting are:
1 error has occurred
ORA-06550: line 12, column 8: PLS-00103: Encountered the symbol "A" when expecting one of the following: := . ( @ % ; ORA-06550: line 17, column 4: PLS-00103: Encountered the symbol ";" when expecting one of the following: if
I feel like I am probably really close to getting this right but I have some small syntax wrong. Could anyone please take a look and give a hand? Thanks.

Answer 1

You can't use a as a variable name. Try a_num.
DECLARE
   a_num int;
BEGIN
   Select ON_TRACK_NUM
     INTO a_num
     from TBL_CMR_TRIAL
    where PK_TRIAL = 2;