If statement with multiple SQL select statements PL/SQL (ORACLE APEX)

I was wondering if it is possible to have multiple SQL select statements within an if statement using PL/SQL. I wanted different select statements based on the value of another field.

This is what I tried so far but I'm stuck and can't go on

    BEGIN
    IF
        :P3_COMPAREWITH <> 'OTHER TABLES'
    THEN
        SELECT TABLE_NAME AS TARGET, TABLE_NAME AS TARGETTABLE 
        FROM ALL_TABLES@target.hu.nl 
        WHERE OWNER = 'TOSAD_2017_2D_TEAM4_TARGET';
    ELSIF
        :P3_COMPAREWITH = 'OTHER TABLES'
    THEN
        SELECT TABLE_NAME AS TARGET, TABLE_NAME AS TARGETTABLE 
        FROM ALL_TABLES@target.hu.nl 
        WHERE OWNER = 'TOSAD_2017_2D_TEAM4_TARGET' AND TABLE_NAME <> :P3_TARGETTABLE;
    END IF;
    END;

If someone could help me out, thanks in advance.