简述在元组关系演算中删除操作的步骤。
删除操作用DELETE语句实现。其步骤为:(1)用HOLD语句把要删除的元组从数据库中读到工作空间中;(2)用DELETE语句删除该元组。
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下一篇:Complete the following sentence with a (compound) word derived from the one(s) given in bracket."Darkness" is a subjective word; it depends on what your( )is and how you live your life. (view, point)
Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
"Darkness" is a subjective word; it depends on what your( )is and how you live your life. (view, point)