问题
单项选择题
SQL语言中，级联删除的短语是
A．WHEN DELETE RESTRICT
B．ON DELETE RESTRICT
C．ON DELETE SET NULL
D．ON DELETE CASCADE
答案
参考答案：D
解析： SQL语言中，级联删除的短语是ON DELETE CASCADE。选项B是受限删除，选项 C是置空值删除。
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SQL语言中，级联删除的短语是
A．WHEN DELETE RESTRICT
B．ON DELETE RESTRICT
C．ON DELETE SET NULL
D．ON DELETE CASCADE
参考答案：D
解析： SQL语言中，级联删除的短语是ON DELETE CASCADE。选项B是受限删除，选项 C是置空值删除。