I have a table which has the following columns: Date, AcctId, CustID, BackupID, Logins, Amount. For a given Date, an AcctID can more than one CustIDs, but I want to assign a singular CustID to an AcctID based on the value of Logins. i.e.: If Cust1 has more Logins than Cust2 for the given Date and AcctID then …
Tag: self-join
How self join works [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 2 years ago. Improve this question I hav…
SQL table join on itself but allow “0” value
Okay so i have a simple table “category” on this table categories and subcategories are saved. categories have “parent_id=0”, and subcategories have a “parent_id” that equals the row_id of the …
Python Pandas non equal join
Have table OUT Need: so i need make non equal join equivalent SQL query : or as SQL query: The problem in PANDAS is that NON EQUAL SELF JOIN cannot be done with MERGE. And I can’t find another way….. Answer We can solve this in pandas in a smarter way by using groupby with agg and joining the stri…
MySQL self join to find only the next revision
Actually I’m working with WordPress. I want to create a self-join or something similar to find a revision of a post, and the following revision of the same post. https://www.db-fiddle.com/f/eHnwYABYrVVQAhn8xLJ77q/1 The previous query doesn’t work since it takes, for every record of a, all the revi…
Is there a way to change this BigQuery self-join to use a window function?
Let’s say I have a BigQuery table “events” (in reality this is a slow sub-query) that stores the count of events per day, by event type. There are many types of events and most of them don’t occur on …
MySQL category with parent_id – SELF Join
My SQL table called categories has the following structure: I would like to know if it’s possible to JOIN the same table and present the parent_id name. I can do this by PHP code, but I would like, because of performance issues, to retrieve as SQL Query. See example at SQLFiddle I’ve managed to JO…
UPDATE rows with values from the same table
I have a table like this: I want to copy the last 3 values and at the end my table will look like this: Is it possible? Answer Use a self-join: If there are gaps in the ID space, generate gapless IDs with the window function row_number(). I do that in a CTE, because I am going to reuse the