Open
Conversation
anjali-deshpande-hub
left a comment
There was a problem hiding this comment.
I agree that the last few questions are challenging. Excellent work. 69/70
| ,DENSE_RANK() OVER (PARTITION BY customer_id ORDER BY market_date ASC) AS visit_num | ||
| FROM customer_purchases | ||
| WHERE market_date < '2022-04-29'; | ||
|
|
| FROM customer_purchases | ||
| ) x | ||
| WHERE x.visit_num = 1; | ||
|
|
| HINT: If you don't specify a WHERE clause, you are going to have a bad time.*/ | ||
| --QUERY 11 | ||
| DELETE FROM temp.product_units | ||
| WHERE product_id == 8 AND snapshot_timestamp == '2026-04-07 09:38:50'; |
There was a problem hiding this comment.
Your query correctly filters by product ID and uses a timestamp condition. Think about how to select the oldest matching row dynamically without hard coding. You can find the oldest record using MIN(snapshot_timestamp)) and delete only that row
anjali-deshpande-hub
approved these changes
Apr 9, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
What changes are you trying to make? (e.g. Adding or removing code, refactoring existing code, adding reports)
submitting assignment 2
What did you learn from the changes you have made?
how to combine pieces of everything we have learned in sql to create more complex queries
Was there another approach you were thinking about making? If so, what approach(es) were you thinking of?
no
Were there any challenges? If so, what issue(s) did you face? How did you overcome it?
the last few questions were very challenging and also very open-ended in how they could be approached.
in particular i was confused about the question where an older CURRENT_TIMESTAMP was deleted - it seemed impossible to replicate as each time the timestamps would change.
How were these changes tested?
manual processing of some examples from raw data
A reference to a related issue in your repository (if applicable)
Checklist