TRIM v13

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The TRIM method removes an element or elements from the end of a collection. The syntax for the TRIM method is:

<collection>.TRIM[(<count>)]

collection is the name of a collection.

count is the number of elements removed from the end of the collection. Advanced Server will return an error if count is less than 0 or greater than the number of elements in the collection.

The following example demonstrates using the TRIM method to remove an element from the end of a collection:

DECLARE
    TYPE sparse_arr_typ IS TABLE OF NUMBER;
    sparse_arr      sparse_arr_typ := sparse_arr_typ(-100,-10,0,10,100);
BEGIN
    DBMS_OUTPUT.PUT_LINE('COUNT: ' || sparse_arr.COUNT);
    sparse_arr.TRIM;
    DBMS_OUTPUT.PUT_LINE('COUNT: ' || sparse_arr.COUNT);
END;

COUNT: 5
COUNT: 4

COUNT indicates that before the TRIM method, there were 5 elements in the collection; after the TRIM method was invoked, the collection contains 4 elements.

You can also specify the number of elements to remove from the end of the collection with the TRIM method:

DECLARE
    TYPE sparse_arr_typ IS TABLE OF NUMBER;
    sparse_arr      sparse_arr_typ := sparse_arr_typ(-100,-10,0,10,100);
    v_results       VARCHAR2(50);
BEGIN
    DBMS_OUTPUT.PUT_LINE('COUNT: ' || sparse_arr.COUNT);
    sparse_arr.TRIM(2);
    DBMS_OUTPUT.PUT_LINE('COUNT: ' || sparse_arr.COUNT);
    FOR i IN sparse_arr.FIRST .. sparse_arr.LAST LOOP
        IF sparse_arr(i) IS NULL THEN
            v_results := v_results || 'NULL ';
        ELSE
            v_results := v_results || sparse_arr(i) || ' ';
        END IF;
    END LOOP;
    DBMS_OUTPUT.PUT_LINE('Results: ' || v_results);
END;

COUNT: 5
COUNT: 3
Results: -100 -10 0

COUNT indicates that before the TRIM method, there were 5 elements in the collection; after the TRIM method was invoked, the collection contains 3 elements.

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