【名词&注释】
计算机网络(computer network)、共享资源(shared resource)、内存容量(internal storage capacity)、精度高(high precision)、速度快(fast)
[单选题]SQL语言中,级联删除的短语是( )。
A. WHEN DELETE RESTRICT B. ON DELETE RESTRICT C. 0N DELETE SET NULL D. 0N DELETE CASCADE