使用SQL Server存储过程更新用户排名

Question

I have two tables, one contains user data and the other contains user ranking information (points needed for the promotion)

Let's say that the user table looks like this:

login | ArticlePoints | PhotoPoints | StageId

and the user ranking information table looks like this:

StageId | StageName | MinimumPoints

and the user information table might contain data like this:

1 | Beginner | 100
2 | Advanced | 200
3 | Expert   | 300

What I would like to have is a procedure which does add user points and check whether it is enough for the ranking promotion. Right now I do it like this:

1. I do have a function which does check "manually" whether the user points is between 100 and 200 and then it does set the user stage = 2, id it's more it check whether it's between 200 and 300 etc.
2. Stored procedure which does update users set stage = MYFUNCTION from the point 1 .

The thing is that it's not a good solution, right now it is not ready for the easy updates(I can't just add Super Expert with minimum 400 points, I'd need to edit the function).

I am trying to prepare a better solution for this problem but I have no idea how to "connect" both tables.

Answer 1

Write an UPDATE query that returns the StageID for the calculated values, something like:

UPDATE t1
SET t1.StageID = 
        (SELECT TOP 1 StageID 
         FROM [RANKING_TABLE] t2 
         WHERE t1.ArticlePoints + t1.PhotoPoints >= t2.MinimumPoints 
         ORDER BY t2.MinimumPoints DESC)
FROM [USER_TABLE] t1

So if the USER has 250 points in total, Beginner and Advanced would be achieved, using the TOP 1 and the ORDER BY t2.MinimumPoints DESC , would select the highest Stage.