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Results tagged with query-performance
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user 186435
For questions about improving the performance and/or efficiency of database queries.
2
votes
1
answer
154
views
Why is my indexed DISTINCT ON so much slower than my INNER JOIN?
I have two tables, customers and purchases. There are a lot (thousands) of purchases per customer. I usually only need the most recent purchase for each customer, which is why I have the latest_purcha …
0
votes
Storing the groupwise most recent related record
After looking some more, I discovered sql triggers and figured out how to update latest_purchase_id with one. That takes away a lot of the hassle and performance loss during insertions, but I'm still …
0
votes
2
answers
96
views
Storing the groupwise most recent related record
I have two tables, customers and purchases. There are a lot (thousands) of purchases per customer. I usually only need the most recent purchase for each customer, which is why I have the "latest_purch …