单项选择题
A.select * from authors where au_id =”72_-%” B.select au_id=72_-% from authors C.select * from authors where au_id like “72*-%” D.select * from authors where au_id like “72_-%” _代表任意一个字符
下面哪一条语句实现了下列功能：在authors数据库中查找所有姓名以d 打头的作家（）A. select * ...
单项选择题下面哪一条语句实现了下列功能：在authors数据库中查找所有姓名以d 打头的作家（）
A. select * from authors where au_name=”d” B. select “d” from authors C. select * from authors where au_name like “d%” D. select au_name like “d%” from authors
select au_id from authors where price$ 20.下面哪一条语句与这一条语句...
单项选择题select au_id from authors where price<$15 or price >$ 20.下面哪一条语句与这一条语句执行效果相同（）
A. select au_id from authors where price IN（$15，：$20）； B. select au_id from authors where price between $15 and $20 C. select au_id from authors where price not between $15 and $20 D. select au_id from authors where price not IN（$15，$20）；
select au_id from authors where state=”ca” or state=”ks...
单项选择题select au_id from authors where state=”ca” or state=”ks”.下面哪一条语句与这一条语句执行效果相同（）
A. select au_id from authors where state IN（“ac”，：”sk”）； B. select au_id from authors where state between ac and sk C. select au_id from authors where state not between ca and ks D. select au_id from authors where state IN（“ca”，：”ks”）；
