Oracle中使用SQL语句create sequence seq1 maxvalue 50;创建sequence，如果current value是50，当你执行select SEQ1.NEXTVAL时将发生什么？ A sequence将回转到1 B 将会报错 C sequence将再次返回50 D sequence将回转到0 B Specify CYCLE to indicate that the sequence continues to generate values after reaching either its maximum or minimum value.