是否有可能在Redis中按值获取数据？

Question

I already checked to be able to find a row by key in Redis. But I wonder if it's possible to find a row by value in same row. For example, my row's data is {"1", "A", "B"} and I wanna find the row by "A" or "B" not by "1" (first columns is key in this case) with Python.

Answer 1

Redis has nothing out of the box for this. You can create a secondary index in Redis on the value. It comes at a cost though - you need more memory to store the index.

Answer 2

you can build your own 'value index'.

for example, you can add a second key with type sorted set, with key: A, value: 1(1), 2(2), 3(3), 4(4), the number in parentheses is score, you can use your own score like timestamp.

so when you want first ten primary key with value A, use this:

zrangebyscore A -inf +inf limit 0 10