I have the following table, Required output, I am looking to add the price for previous row. Row 1 is 0 because it has no previous row value. Find ratio ie 10/30=0.33 Answer You can use analytical function ROW_NUMBER and SUM as follows: DB<>Fiddle demo
Tag: window-functions
SQL: Select certain rows with window functions in MySQL/MariaDB
My problem can be simplified to the following example: Now I’m looking for an sql statement which selects all rows (ordered by dfrom) having a dfrom not between the dfrom and dto of any previously selected row, possibly using window functions to get informations on other rows, like this: resulting in: Can anyone give me the necessary sql statement? Answer
How can I create a column which computes only the change of other column on redshift?
I have this dataset: The dataset has the product the company sells and the customers who saw the product. A customer can see more than one product, but the combination product + customer doesn’t have any repetition. I want to get how many people bought the product before the customer sees it. This would be the perfect output: As you
Why ROW_NUMBER is defined as window function?
I would like to understand better the meaning of window function. The definition says: A window function performs a calculation across a set of table rows (the window) that are somehow related to the current row Let’s consider ROW_NUMBER() (the same could be applied for RANK() or DENSE_RANK()). The function simply assign a number to an ordered set of rows.
Wrong syntax for OVER and PARTITION in MySQL syntax
SELECT Id, Price, CustomerId, ROW_NUMBER() OVER (PARTITION BY CustomerId) FROM Orders; I get the error “Syntax error: Unexpected ‘(‘ (opening parenthesis) Does MySQL not support this? I’m pretty …
SQL: Expression Not in GROUP BY Key
I have a transaction table t1 in Hive that looks like this: store_id cust_id zip_code transaction_count spend 1000 100 123 3 50 2000 200 …
Convert multiple self JOINs to window function or subqueries (SQL)
I have a query with several self joins: Here is a sample table where in yellow I marked the record that is within the boundaries of the where condition: Here is the expected result view: Basically I filter one table with several consecutive conditions and show the result as a table. Is there a way, using window function or subquery
Big Query – Calculate start and end date back to back
I have a problem, which I need some advise, I am required to calculate the number of leave calendar days taken back-to-back on big query. (For eg. 2 leave records taken on 07-01-2020 to 10-01-2020 and 13-01-2020 to 15-01-2020, should return 07-01-2020 to 15-01-2020) However, there are certain weeks, where leave is taken at 3/4 days gap because there is
Order by descending aggregation within window function in PostgreSQL
I have a dataset that features duplicate values of the the primary variable, something like the following: I have achived this by using the following code However, my desired output needs to be ordered such that counts is descending yet col1 remains partitioned, so that I can see, for example, which value from col1 has the highest number of counts.
SQL Informix advanced query
Let me try to explain what I want to do with my data. Structure of my data is as follows: I have 3 columns: date, id, and stage. Stages can be different numbers, but I’m interested in showing specific transition of some id from stage -1 to stage 1. Please see the example below. I have an id that was