已知 student 表有姓名字段 name。若想查询所有姓“王”的学生,并且姓名由三个字符组成,则应使用的SQL 语句是
A. SELECT* FROM student WHERE name LIKE ‘王__’;
B. SELECT* FROM student WHERE name LIKE ‘王%_’;
C. SELECT* FROM student WHERE name LIKE ‘王%’;
D. SELECT* FROM student WHERE name =’王__’;
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下列选项中,能够查询 student 表中 id 值不在2和5之间的学生的 SQL 语句是
A. SELECT* FROM student WHERE id !=2,3,4,5;
B. SELECT* FROM student WHERE id NOT BETWEEN 5 AND 2;
C. SELECT* FROM student WHERE id NOT BETWEEN 2 AND 5;
D. SELECT * FROM student WHERE id NOT in 2,3,4,5;
已知用户表 user 有字段 ct ,若想查询 ct 字段值为 NULL 的用户,则应使用的 SQL语句的是
A. SELLECT * FROM user WHERE ct = NULL ;
B. SELECT * FROM user WHERE ct link NULL ;
C. SELECT * FROM user WHERE ct = ‘NULL’ ;
D. SELECT * FROM user WHERE ct IS NULL ;
下列选项中,代表匹配单个字符的通配符是
A. %
B. *
C. _
D. ?
下列选项中,与“SELECT* FROM student WHERE id not between 2 and 5;”等效的 SOL 语句是注: id 的数据类型是整型。
A. SELECT * FROM student WHERE id !=2,3,4,5;
B. SELECT * FROM student WHERE id NOT BETWEEN 5 and 2;
C. SELECT * FROM student WHERE id NOT in (2,3,4,5);
D. SELECT * FROM student WHERE id NOT in 2,3,4,5;
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