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;
A: SELECT gender FROM student;
B: SELECT DISTINCT * FROM student;
C: SELECT DISTINCT gender FROM student;
D: SELECT * FROM student;
举一反三
- 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’;
- 下列选项中,用于将 student 表按照 gender 字段进行分组查询,并且查询 score 字段值之和小于300的分组的 SQL 语句是 A: SELECT gender , SUM ( score ) FROM student GROUP BY gender HAVING SUM ( score )<;300; B: SELECT gender , SUM ( score ) FROM student GROUP BY gender WHERE SUM ( score )300; C: SELECT gender , SUM ( score ) FROM student WHERE SUM ( score )<;300 GROUP BY gender ; D: 以上语句都不对
- 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
- 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（1.0分） 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