Advanced queries in HBase
- by Teflon Ted
Given the following HBase schema scenario (from the official FAQ)...
How would you design an Hbase table
for many-to-many association between
two entities, for example Student and
Course?
I would define two tables:
Student: student id student data
(name, address, ...) courses (use
course ids as column qualifiers here)
Course: course id course data (name,
syllabus, ...) students (use student
ids as column qualifiers here)
This schema gives you fast access to
the queries, show all classes for a
student (student table, courses
family), or all students for a class
(courses table, students family).
How would you satisfy the request: "Give me all the students that share at least two courses in common"? Can you build a "query" in HBase that will return that set, or do you have to retrieve all the pertinent data and crunch it yourself in code?
