How to make a Data Modifying CTE abort if an update only partially succeeded?
I am wondering if it is possible to add some kind of check to make a data modifying CTE abort if an update is partially successful. Attached is a minimal query that represents the problem. I would like...
View ArticleCount 2 tables same query - PG 9.3
I've got two tables that I need a count on both of them.table1: idtable2: cid (table1.id = table2.cid) -- Join can be done by this.I already got two queries that I'm using, and wanna put them in one...
View ArticleWhen generating combinations using a CTE, is there a way to use an index to...
I have a project that involves combining a variety of things into their possible combinations. This includes permutations, combinations, with and without repetition, and some more exotic ways of...
View ArticleHandling transformations in keys with CTEs
Suppose someone wrote the following querySELECT col1, col2 FROM tableWHERE CAST(col1 AS INTEGER) AND f(col2) = 2such that f doesn't have a good inverse function that I could apply to 2. The transformed...
View ArticleGetting sum for each day based on most recent timestamp entry for each entity
I have a table that contains an ID, timestamp, and integer. Each row is a "snapshot" of the entity at a given time:TableAIDtimestampnumA2024-02-045B2024-02-043C2024-02-078A2024-02-073My goal is to get...
View Articlecreating a CTE to filter previous CTE populaiton down. How to find new...
The first CTE grabs all patients with the diagnosis codes for substance abuse, the second CTE should filter down to only NEW paitents.Meaning of the people in the first CTE, which of thses people have...
View ArticleCTE where to place the where clause to filter rows sooner (in postgresql)?
I have function with CTE which looks like this:function param(p_userId, p_templateId) with a(select...), b (select..), c (insert..returning..), d (update..returning..), ...k(select..) insert ... select...
View ArticlePostgreSQL CTE behavior influenced by outer `update` statement: Why?
tl;drWhy does an update from ... statement make a CTE behave differently than an update where... with subquery statement in postgresql?Full ContextDisclaimer: The information below has been sanitized...
View ArticleHow do I calculate a streak of data and show the data that corresponds to it...
I'm currently working on a project with NBA stats and I want to check a player's longest streak of his highest amount of points on MySQL. I'm open to a 5-10 game streak to simplify it.For example:...
View ArticleLocking for update inside CTEs
If I make a query using CTEs that looks like that:WITH cte_a AS ( SELECT a.id, a.something FROM a WHERE a.something IS NOT NULL ),-- [...] some other CTEscte_d AS ( SELECT cte_a.id, cte_a.something...
View ArticleTrouble with slow stored procedure performance on 35M rows with CTE/Temp table
We recently went through a new feature release to our app that added about 25 new columns to a large table (~35 million rows), and now we're having some major query performance issues. I assume that it...
View ArticleSQL Server CTE improves query performance due to larger memory grant?
I have a large table (20M+) which has a clustered index on COBID.When I run this query:SELECT * FROM dbo.mytableWHERE COBId = 20240723 AND TradeID = '123456'it completes in around 10 seconds.However I...
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PostgreSQL window function: Add value in CASE running sum gets below threshold
For context:I am playing with a filling level sensor, a water tank and a watering pump and have the following problem:I have an initial filling value for my tank.Each time step, I am subtracting a...
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Recursively sum child's nominal to parent, on dynamic level parent-child...
i have data look like this :i try to sum the Nominal column to each respective parent, so it will looks like this :i provided the sql script for the data :SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER...
View ArticleReturn the longest consecutive sequence of a value in specific column
I am using PostgreSQL 12.0 and trying to get the longest sequence of continuous rows for a specific column and value.The table is called team2 and contains a team's results which looks like:match_id...
View ArticleUsing OFFSET FETCH NEXT performing slow when actual row count is lower than...
In SQL Server 2022 I have a stored procedure that retrieves a list of items. It performs well except when the actual row count of items is lower than specified in the FETCH NEXT statement.Here is...
View ArticleReturn the longest consecutive sequence of a value in specific column
I am using PostgreSQL 12.0 and trying to get the longest sequence of continuous rows for a specific column and value.The table is called team2 and contains a team's results which looks like:match_id...
View ArticlePostgreSQL CTE Recursion - How to Improve Performance for Parent->Child Tree...
I am working on a query that performs PostgreSQL CTE Recursion in PostgreSQL 13. This query is intended to recurse from the root nodes to the deepest leaf node with certain properties (labeled 'begat'...
View ArticleAre non-used CTEs never materialized in PostgreSQL 16?
I want to return my post rows in one of three sort orders, controlled by a sorting_param function parameter. The sorting is complex, doesn't lend itself to a simple ORDER BY CASE .... So I'm thinking...
View ArticleWhy delete and insert in a CTE works despite UNIQUE constraint?
Given a table with a unique constraint on a columnCREATE TABLE t( id int GENERATED ALWAYS AS IDENTITY, name text NOT NULL UNIQUE);Let's create a single recordINSERT INTO t (name) VALUES ('a');When I...
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