• 2022-07-24
    请指出下列的表达式声明中,错误的是那一项()
    A: DECLARE
    v_id NUMBER(4);
    B: DECLARE
    v_x,
    v_y, v_z VARCHAR2(10);
    C: DECLARE
    v_birthdate DATE NOT NULL;
    D: DECLARE
    v_in_stock BOOLEAN := 1;