delete from employee语句的作用是( )A.删除当前数据库中整个employee表,包括表结构B.删除当前数据库中employee表内的所有行C.由于没有where子句,因此不删除任何数据D.删除当前数据库中employee表内的当前行

题目

delete from employee语句的作用是( )

A.删除当前数据库中整个employee表,包括表结构

B.删除当前数据库中employee表内的所有行

C.由于没有where子句,因此不删除任何数据

D.删除当前数据库中employee表内的当前行


相似考题
更多“delete from employee语句的作用是( ) A.删除当前数据库中整个employee表,包括表结构 ”相关问题
  • 第1题:

    已知employee表中具有默认约束df_email,删除该约束的语句为_________。

    A.alter table employee drop constraint df_email

    B.alter table employee remove constraint df_email

    C.alter table employee delete constraint df_email

    D.remove constraint df_email from table employee


    A

  • 第2题:

    已知employee表中有默认约束de_email,删除该约束的语句为()

    A.Alter table employee drop df_email

    B.Alter table employee remove df_email

    C.Alter table employee delete df_email

    D.remove df_email from table employee


    Alter table employee drop df_email

  • 第3题:

    已知employee表中具有约束df_email,删除该约束的语句为_________。

    A.alter table employee drop constraint df_email

    B.alter table employee remove constraint df_email

    C.alter table employee delete constraint df_email

    D.remove constraint df_email from table employee


    A

  • 第4题:

    已知employee表中具有默认约束df_email,删除该约束的语句为_________。

    A.remove constraint df_email from table employee

    B.alter table employee remove constraint df_email

    C.alter table employee drop constraint df_email

    D.alter table employee delete constraint df_email


    A

  • 第5题:

    4、已知employee表中具有默认约束df_email,删除该约束的语句为_________。

    A.alter table employee drop constraint df_email

    B.alter table employee remove constraint df_email

    C.alter table employee delete constraint df_email

    D.remove constraint df_email from table employee


    C