The height of the terra-cotta warriors varies from 1.78m to 1.97m, just like that of the real soldiers.
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The Gui Fei Bathing Pool is known otherwise as the Flowering Crab-apple Hot Spring or Lotus Hot Spring where Lady Yang used to take baths.
A. 对
B. 错
在使用SQL语句查询数据时，若想要使用Like关键字来匹配单个字符，那么其通配符是（ ）。
A. %
B. *
C.
D. _
以下删除记录正确的( )
A. Delete from emp where name='dony';
B. Delete * from emp where name='dony';
C. Drop from emp where name='dony';
Drop * from emp where name='dony';
用户表user有多列，其中字段id中没有null值，字段username中存在null值，以下SQL语句不能获得user表的总记录数的是那一个？（ ）
A. select count(*) from user;
B. select count(id) from user;
C. select count(username) from user;
D. select count(1) from user;
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