Help with SQL query

thegillion

@scottalanmiller I know you can user AVG like this

SELECT AVG(`Rating`) FROM `Reviews` WHERE `bathroom_ID` = 100

scottalanmiller

This is MySQL, right?

thegillion

@scottalanmiller yes

scottalanmiller

@thegillion said in Help with SQL query:

@scottalanmiller I know you can user AVG like this
SELECT AVG(`Rating`) FROM `Reviews` WHERE `bathroom_ID` = 100

Yes, that I know works, too.

scottalanmiller

Is this an intentional fast lookup cache table? Because this violated the database integrity. Just a thought while I'm looking for an answer.

scottalanmiller

@thegillion said in Help with SQL query:

Maybe I'm obtuse, but why is there an AS Rating? Just remove that bit.

scottalanmiller

UPDATE bathrooms
   SET bathrooms.Rating = (SELECT AVG(Reviews.Rating)
                   FROM Reviews
                  WHERE Reviews.bathroom_ID = bathrooms.id)

scottalanmiller

Did that work?

StrongBad

@scottalanmiller said in Help with SQL query:

@thegillion said in Help with SQL query:

Maybe I'm obtuse, but why is there an AS Rating? Just remove that bit.

I was just looking at that and couldn't see where it was being used either.

thegillion

@scottalanmiller said in Help with SQL query:

UPDATE bathrooms
   SET bathrooms.Rating = (SELECT AVG(Reviews.Rating)
                   FROM Reviews
                  WHERE Reviews.bathroom_ID = bathrooms.id)

@scottalanmiller said in Help with SQL query:

Did that work?

Yes it did work thank you!!!

thegillion

@scottalanmiller said in Help with SQL query:

Is this an intentional fast lookup cache table? Because this violated the database integrity. Just a thought while I'm looking for an answer.

The bathroom table is the main table for lookups so yes and the server runs on SSDs with 4gb of ram and two 3.2ghz vCores

scottalanmiller

@thegillion said in Help with SQL query:

@scottalanmiller said in Help with SQL query:
UPDATE bathrooms
   SET bathrooms.Rating = (SELECT AVG(Reviews.Rating)
                   FROM Reviews
                  WHERE Reviews.bathroom_ID = bathrooms.id)
@scottalanmiller said in Help with SQL query:

Did that work?

Yes it did work thank you!!!

Boom, sweet! You can use the ellipses on the individual post to make it as the correct answer, too

scottalanmiller

@thegillion said in Help with SQL query:

@scottalanmiller said in Help with SQL query:

Is this an intentional fast lookup cache table? Because this violated the database integrity. Just a thought while I'm looking for an answer.

The bathroom table is the main table for lookups so yes and the server runs on SSDs with 4gb of ram and two 3.2ghz vCores

Are you going to do a scheduled batch run on this (tee hee, batch run) like at night to update the reviews?

thegillion

@scottalanmiller said in Help with SQL query:

Are you going to do a scheduled batch run on this (tee hee, batch run) like at night to update the reviews?

I was going to do that or pass the ID of the bathroom then fire it on a review or bathroom submission.

scottalanmiller

@thegillion said in Help with SQL query:

@scottalanmiller said in Help with SQL query:

Are you going to do a scheduled batch run on this (tee hee, batch run) like at night to update the reviews?

I was going to do that or pass the ID of the bathroom then fire it on a review or bathroom submission.

You could use a database trigger for that, too.

scottalanmiller

If you expect this product to explode you might want to consider a NoSQL database now. Easy to switch now, hard later. MySQL scales pretty big, but things like MongoDB and Cassandra go so much bigger. Worth thinking about now before you are more or less locked in.

BRRABill

@scottalanmiller said in Help with SQL query:

If you expect this product to explode

Possible poor choice of words.

scottalanmiller

@BRRABill said in Help with SQL query:

@scottalanmiller said in Help with SQL query:

If you expect this product to explode

Possible poor choice of words.

Or... intentional.

BRRABill

@scottalanmiller said in Help with SQL query:

@BRRABill said in Help with SQL query:

@scottalanmiller said in Help with SQL query:

If you expect this product to explode

Possible poor choice of words.

Or... intentional.

Knowing you, intentional.