fix: instance variable removed

Author: DenzelCode

src/main/java/com/code/advancedsql/query/Query.java

@@ -11,9 +11,9 @@
 
 public abstract class Query<T extends IQuery> implements IQuery {
 
-    protected ISQL sql = null;
+    protected ISQL sql;
 
-    protected String table = null;
+    protected String table;
 
     protected List<Object> execute = new ArrayList<>();
 
@@ -23,8 +23,6 @@ public abstract class Query<T extends IQuery> implements IQuery {
 
     protected int limit = 0;
 
-    private T instance;
-
     public Query(ITable table) {
         this.sql = table.getSQL();