"_" + courseId)); put.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("score"), Bytes.toBytes(score));将代码补全
时间: 2023-07-21 17:14:41 浏览: 98
完整代码如下:
```
// 创建Put对象
Put put = new Put(Bytes.toBytes(studentId));
// 添加列族为"cf",列修饰符为"courseId",列值为课程ID的列
put.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("courseId"), Bytes.toBytes(courseId));
// 添加列族为"cf",列修饰符为"score",列值为成绩的列
put.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("score"), Bytes.toBytes(score));
// 将Put对象写入HBase表
table.put(put);
```
相关问题
select tb_student* from tb_student,tb_course,tb_score,tb_teacher, WHERE tb_teacher.id='张三'. and tb_student.id=tb_score.studentid and tb_score.courseid=tb_course.id and tb_course.teacherid=tb_teacher.id
这是一个 SQL 查询语句,其目的是查询学生表中所有选了张三老师教授的课程的学生信息。该查询语句中的语法存在一些错误,应该修改为:
```
SELECT tb_student.*
FROM tb_student, tb_course, tb_score, tb_teacher
WHERE tb_teacher.teacher_name = '张三' AND tb_student.id = tb_score.studentid AND tb_score.courseid = tb_course.id AND tb_course.teacherid = tb_teacher.id;
```
具体的查询条件是:在学生表、课程表、成绩表、教师表中,分别对应的字段是 tb_student.id、tb_course.id、tb_score.studentid、tb_course.teacherid、tb_teacher.teacher_name,通过这些字段的关联,筛选出教师姓名为张三的课程对应的学生信息。
需要注意的是,该查询语句中的表名和字段名应该根据实际情况进行修改,同时建议使用 JOIN 关键字来进行表的连接,可以使 SQL 查询语句更加清晰易懂。
SELECT ec.id ,ec.title,ec.price ,ec.lesson_num ,ec.cover, ecd.description, et.`name`, es1.title as subjectLevelOne, es2.title as subjectLevelTwo FROM `edu_course` ec LEFT JOIN edu_course_description ecd ON ec.id = ecd.id LEFT JOIN edu_teacher et ON ec.teacher_id = et.id LEFT JOIN edu_subject es1 ON ec.subject_parent_id = es1.id LEFT JOIN edu_subject es2 ON ec.subject_id = es2.id WHERE ec.id = #{courseId}
这是一条 SQL 查询语句,目的是从 "edu_course" 表中获取指定 "courseId" 的课程信息及其对应的教师、科目等信息。具体查询的字段包括 "id"、"title"、"price"、"lesson_num"、"cover"、"description"、"name"、"subjectLevelOne"、"subjectLevelTwo"。同时,使用了 "LEFT JOIN" 连接多个表,将它们的相关信息进行关联。
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