A: 查询student表中不重复的name记录
B: 查询时只能消除name字段的重复性
C: 查询时能消除name字段重复性，不能消除gender字段的重复性
D: 查询student表中name和gender记录，并保证没有重复记录
举一反三
- 查询student表中的gender字段（gender代表性别），使其查询记录中不能出现重复值的SQL语句是（1.0分） A: SELECT gender FROM student; B: SELECT DISTINCT * FROM student; C: SELECT DISTINCT gender FROM student; D: SELECT * FROM student;
- 查询student表中的gender字段(gender代表性别),使其查询记录中不能出现重复值的SQL语句是
- 查询student表中id字段值小于5,并且gender字段值为“女”的学生姓名的SQL语句是() A: SELECT name FROM student WHERE id<;5 OR gender='女'; B: SELECT name FROM student WHERE id<;5 AND gender='女'; C: SELECT name FROM student WHERE id<;5 ,gender='女'; D: SELECT name FROM student WHERE id<;5 AND WHERE gender='女';
- 【单选题】查询student表中id字段值小于5,并且gender字段值为“女”的学生姓名的SQL语句是 A. SELECT name FROM student WHERE id<5 OR gender‘女’; B. SELECT name FROM student WHERE id<5 AND gender=‘女’; C. SELECT name FROM student WHERE id<5 ,gender=‘女’; D. SELECT name FROM student WHERE id<5 AND WHERE gender=‘女’;
- 假设student表中共有9条记录，而存在name与gender值完全相同的记录有3条，那么使用 SELECT DISTINCT name,gender FROM student;语句查询出的记录条数是
内容
- 0
阅读下面的SQL语句: SELECT DISTINCT name,gender FROM student; 关于此SQL语句的描述,正确的是
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表student中的包含两个字段，整型的id，字符串型的name。只显示表student中name列记录的SQL语句正确的是（） A: select name from student B: select * from student C: select from name in student D: select name
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若想查询student表中name为空值的记录，则正确的SQL语句是（ ）。 A: SELECT * FROM student WHERE name = NULL; B: SELECT * FROM student WHERE name like NULL; C: SELECT * FROM student WHERE name = 'NULL'; D: SELECT * FROM student WHERE name is NULL;
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若想查询student表中name为空值的记录，则正确的SQL语句是（1.0分） A: select * from student where name = null; B: select * from student where name link null; C: select * from student where name = 'null'; D: select * from student where name is null;
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已知 student 表有姓名字段 name ,并且存在 name 为’sun%er’的记录。下列选项中,以匹配“ sun%er ”字段值的 SQL 语句是 A: SELECT * FROM student WHERE name LIKE ‘sun%er’; B: SELECT * FROM student WHERE name LIKE ‘%%%’; C: SELECT * FROM student WHERE name LIKE '%\%%'; D: SELECT * FROM student WHERE name =‘sun%er’;