题目内容

下面SQL语句中，用于删除user表中id大于5的记录的语句是

A. DELETE FROM user where id>5;
B. DELETE FROM user set id>5;
C. DELETE user where id>5;
DELETE user set id>5;

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下面关于DELETE与TRUNCATE语句删除记录的描述，正确的是

A. DELETE比TRUNCATE语句效率更高
B. TRUNCATE比DELETE语句效率更高
C. DELETE只能删除表中部分记录
DELETE只能删除表中全部记录

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下面关于SQL语句truncate table user;的解释，正确的是

A. 查询user表中的所有数据
B. 与“delete from user；“完全一样
C. 删除user表，并再次创建user表
D. 删除user表

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下列选项中，能够一次性向student表中添加三条记录的SQL语句是

A. INSERTINTOstudentVALUES(6,‘lilei',99);(7,'hanmeimei';,100);(8,'poly',40.5);
B. INSERTINTOstudentVALUES(6‘lilei',99)(7,'hanmeimei',100)(8,'poly',40.5);
C. INSERTINTOstudentVALUES(6,‘lilei',99),(7,'hanmeimei,100),(8,'poly',40.5);
D. INSERTINTOstudentVALUES(6,‘lilei',99)VALUES(7,'hanmeimei,100)VALUES(8,'poly',40.5);

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下面选项中，用于将表student中字段grade值更新为80的SQL语句是

ALTERTABLEstudentsetgrade=80;
B. UPDATEstudentsetgrade=80wheregrade=80;
C. UPDATEstudentsetgrade=80wheregrade<=80;
D. UPDATEstudentsetgrade=80;

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下面SQL语句中，用于删除user表中id大于5的记录的语句是

A. DELETE FROM user where id>5; B. DELETE FROM user set id>5; C. DELETE user where id>5; DELETE user set id>5;

下面关于DELETE与TRUNCATE语句删除记录的描述，正确的是

下面关于SQL语句truncate table user;的解释，正确的是

下列选项中，能够一次性向student表中添加三条记录的SQL语句是

下面选项中，用于将表student中字段grade值更新为80的SQL语句是

A. DELETE FROM user where id>5;
B. DELETE FROM user set id>5;
C. DELETE user where id>5;
DELETE user set id>5;