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Category:Anime musical groups
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Category:Musical groups from Saitama PrefectureQ:
CSV file structure to efficiently store values of a certain type
I have a database table with a bunch of rows. A row looks something like this:
user_id, product_id, amount
There can be thousands of such rows and I want to store values of a certain type in the database. For example:
customerA -> 100, 200
customerB -> 500, 600
or
customerA -> 100, 200, 500
customerB -> 200, 300, 600
It's clear that the amount of rows with a customer can be small compared to other rows. So I thought about a table that looks like:
id, customer_id, amount
and another table that stores info about the customers:
id, name
My question is how to structure this database so that I can efficiently store values of a certain type? I am looking for the best practice to store the amounts of a certain customer.
In my real case there are even more different types of values so there are also many tables. I just want to know the best way to store such values.
A:
You can't have a column in your table that contains values of different types. What is done is that you normalize your data in order to efficiently store the info and get to the raw data later when you need it.
In your case, you need a table called "User_Products" that looks like this:
id int(auto increment)
customer_id int(foreign key)
amount int
In this table, the "id" is your primary key and the "customer_id" is your foreign key that references the id in the users table. If you want to get the amount of a certain customer, you can use this query:
SELECT SUM(amount)
FROM User_Products
WHERE customer_id = 123
or, if you want to get the amount and the customer:
SELECT
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