[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fPBSr2U8La8YdPXYTl-YZa_QbbfSlfCCI1Nv4Q0Nv-tc":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":21,"type":22},[],"2026-05-17 23:32:06",374606080,[8,9,10,11],"FROM 学生 SELECT 姓名, 班级","SELECT 姓名, 班级 FROM 学生","SELECT 姓名, 班级 FROM 班级","SELECT 学号, 姓名 FROM 学生",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","表名:学生+--------+------+-----------+| 学号 | 姓名 | 班级 |+--------+------+-----------+| 001 | 张三 | 大数据1班 || 002 | 李四 | 大数据2班 |+--------+------+-----------+题目:要查询"学生"表中的"姓名"和"班级",正确的SQL语句是",[18,23,32,41,50,59,68,74,83,88],{"answer":19,"createTime":5,"id":6,"options":20,"question":16,"source":21,"type":22},[],[8,9,10,11],"v1",0,{"answer":24,"createTime":5,"id":25,"options":26,"question":31,"source":21,"type":22},[],374606081,[27,28,29,30],"SELECT * FROM 选课 JOIN 课程 ON 选课.课程号 = 课程.课程号","SELECT * FROM 选课, 课程 WHERE 选课.课程号 = 课程.课程号 JOIN","SELECT * JOIN 选课, 课程 ON 选课.课程号 = 课程.课程号","SELECT * FROM 选课 JOIN 课程 WHERE 选课.课程号 = 课程.课程号","表名:选课 表名:课程+--------+----------+ +----------+---------------+| 学号 | 课程号 | | 课程号 | 课程名 |+--------+----------+ +----------+---------------+| 001 | C01 | | C01 | MySQL数据库|| 002 | C02 | | C02 | Python编程 |+--------+----------+ +----------+---------------+题目:查询所有选课记录及对应的课程名称,正确的JOIN语法是",{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":21,"type":22},[],374606082,[36,37,38,39],"SELECT 学生.姓名, 成绩.分数 FROM 学生 INNER JOIN 成绩 ON 学生.学号 = 成绩.学号","SELECT 学生.姓名, 成绩.分数 FROM 学生 LEFT JOIN 成绩 ON 学生.学号 = 成绩.学号","SELECT 学生.姓名, 成绩.分数 FROM 学生 RIGHT JOIN 成绩 ON 学生.学号 = 成绩.学号","SELECT 姓名, 分数 FROM 学生, 成绩","表名:学生 表名:成绩+--------+------+ +--------+----------+-------+ | 学号 | 姓名 | | 学号 | 课程号 | 分数 |+--------+------+ +--------+----------+-------+ | 001 | 张三 | | 001 | C01 | 88 | | 002 | 李四 | | 003 | C01 | 92 | | 003 | 王五 | +--------+----------+-------++--------+------+题目:查询有成绩记录的学生姓名和分数,使用内连接.以下哪条语句能正确返回张三88分和王五92分(不包含李四)",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":21,"type":22},[],374606083,[45,46,47,48],"SELECT 课程.课程名 FROM 学生, 选课, 课程 WHERE 学生.姓名='张三'","SELECT 课程.课程名 FROM 学生 JOIN 选课 ON 学生.学号=选课.学号 JOIN 课程 ON 选课.课程号=课程.课程号 WHERE 学生.姓名='张三'","SELECT 课程.课程名 FROM 学生 INNER JOIN 选课 INNER JOIN 课程 ON 选课.课程号=课程.课程号 WHERE 学生.姓名='张三'","SELECT 课程.课程名 FROM 学生 JOIN 选课 JOIN 课程 ON 学生.学号=选课.学号","表名:学生 表名:选课 表名:课程+------+----+ +------+------+ +------+--------+ |学号 |姓名| |学号 |课程号| |课程号|课程名 |+------+----+ +------+------+ +------+--------+ |001 |张三| |001 |C01 | |C01 |MySQL | |002 |李四| |001 |C02 | |C02 |Hadoop |+------+----+ +------+------+ +------+--------+题目:查询"张三"选修的所有课程名称,需要连接三张表.正确的SQL语句是",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":21,"type":22},[],374606084,[54,55,56,57],"SELECT a.姓名 AS 员工","姓名 AS 主管 FROM 员工 a JOIN 员工 b ON a.主管号 = b.员工号B. SELECT a.姓名 AS 员工, b.姓名 AS 主管 FROM 员工 a LEFT JOIN 员工 b ON a.主管号 = b.员工号","SELECT a.姓名 AS 员工, b.姓名 AS 主管 FROM 员工 a RIGHT JOIN 员工 b ON a.主管号 = b.员工号","SELECT 姓名 AS 员工, 姓名 AS 主管 FROM 员工","表名:员工+--------+--------+----------+ | 员工号 | 姓名 | 主管号 |+--------+--------+----------+ | 001 | 张经理 | NULL | | 002 | 李主管 | 001 | | 003 | 王员工 | 002 |+--------+--------+----------+题目:查询每个员工及其主管的姓名,结果应显示:张经理的主管为NULL,李主管的主管为张经理,王员工的主管为李主管.正确的自连接语句是",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":21,"type":22},[],374606085,[63,64,65,66],"SELECT * FROM 学生 JOIN 成绩 USING (学号)","SELECT * FROM 学生 JOIN 成绩 ON 学生.学号 = 成绩.学号","SELECT * FROM 学生 JOIN 成绩 USING 学号","SELECT * FROM 学生 JOIN 成绩 WHERE 学号 = 学号","表名:学生 表名:成绩+------+-----+ +------+--------+-------+| 学号 | 姓名 | | 学号 | 课程号 | 分数 |+------+-----+ +------+--------+-------+| 001 |张三 | | 001 | C01 | 88 || 002 |李四 | | 002 | C02 | 75 |+------+-----+ +------+--------+-------+题目:两张表都有同名字段"学号",查询学生的成绩信息,使用USING子句简化连接条件.正确的语句是",{"answer":69,"createTime":5,"id":70,"options":71,"question":73,"source":21,"type":22},[],374606086,[37,38,36,72],"SELECT 学生.姓名, 成绩.分数 FROM 学生 JOIN 成绩 ON 学生.学号 = 成绩.学号","表名:学生 表名:成绩+------+------+ +------+-------+-------+| 学号 | 姓名 | | 学号 | 课程号 | 分数 |+------+------+ +------+-------+-------+| 001 | 张三 | | 001 | C01 | 88 || 002 | 李四 | | 002 | C01 | 92 || 003 | 王五 | | 004 | C01 | 85 |+------+------+ +------+-------+-------+题目:查询所有学生及其成绩(没有成绩的学生成绩显示为NULL),正确的结果应包含学号003(王五)且分数为NULL.应使用",{"answer":75,"createTime":5,"id":76,"options":77,"question":82,"source":21,"type":22},[],374606087,[78,79,80,81],"SELECT 姓名 FROM 学生 WHERE 学号 IN (SELECT 学号 FROM 选课)","SELECT 姓名 FROM 学生 WHERE 学号 NOT IN (SELECT 学号 FROM 选课)","SELECT 姓名 FROM 学生 WHERE 学号 IN (SELECT DISTINCT 学号 FROM 选课)","SELECT 姓名 FROM 学生 WHERE 学号 NOT EXISTS (SELECT 学号 FROM 选课)","表名:学生 表名:选课+------+------+ +------+----------+ | 学号 | 姓名 | | 学号 | 课程号 |+------+------+ +------+----------+ | 001 | 张三 | | 001 | C01 | | 002 | 李四 | | 001 | C02 | | 003 | 王五 | | 003 | C01 |+------+------+ +------+----------+题目:查询没有选修任何课程的学生姓名.正确的IN子查询语句是",{"answer":84,"createTime":5,"id":85,"options":86,"question":87,"source":21,"type":22},[],374606088,[37,38,36,72],"表名:学生 表名:成绩+------+------+ +------+----------+-------+| 学号 | 姓名 | | 学号 | 课程号 | 分数 |+------+------+ +------+----------+-------+| 001 | 张三 | | 001 | C01 | 88 || 002 | 李四 | | 002 | C01 | 92 || 003 | 王五 | | 004 | C01 | 85 |+------+------+ +------+----------+-------+题目:查询所有成绩记录及其对应的学生姓名(如果成绩表中的学号在学生表中不存在,则姓名字段显示为 NULL).正确的结果应包含学号 004(分数 85,姓名为 NULL).应使用以下哪条 SQL 语句",{"answer":89,"createTime":5,"id":90,"options":91,"question":96,"source":21,"type":22},[],374606089,[92,93,94,95],"内连接(INNER JOIN)会返回左表和右表中所有记录,不匹配的位置用 NULL 填充","左外连接(LEFT JOIN)返回左表的全部记录,以及右表中匹配的记录,右表无匹配时对应字段为 NULL","右外连接(RIGHT JOIN)返回右表的全部记录,但左表中不匹配的记录会被丢弃","全外连接(FULL OUTER JOIN)只返回左表和右表中匹配的记录,不匹配的记录不显示","题目:在 MySQL 中(假设支持理论上的 FULL OUTER JOIN),关于以下四种连接类型的描述,正确的是"]