CTE placement of Where clause
Is there a difference performance wise between these 2 examples:WITH CTE1 AS ( SELECT Col1, Col2, Col3 FROM dbo.Table1 WHERE Col3 = '1' )select * from CTE1WITH CTE1 AS ( SELECT Col1, Col2, Col3 FROM...
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Recursive CTE Multiple Levels [duplicate]
I have a table showing which roles recursively grant access to which resources within a database. For example:The Default_Role grants access to the App_Role, the App_Role grants access to the...
View ArticleUnrecognized configuration parameter when using set_config(text, text,...
I'm trying to implement a simple ABAC system using row level security, with main policy defined as following:CREATE policy resource_access ON resourceUSING ( ( org_id::varchar =...
View ArticleCorrecting and Detecting overlapped dates with CTE
I have a CTE that marks (as bits) overlapped records based on certain criteria. After filtering, I need to update these records to "correct" them and make them sequential, but I'm getting a 4104 on the...
View ArticlePSQL cte delete seem have have ambiguity when select same column from delete...
Both these two sql can be execute , the first one delete all , the second one is logic right.the first onewith d0 as ( delete from seller_create_request where seller_id in ( select id from seller where...
View ArticleHow to rewrite slow CTE construction to match speed of temp tables
I think the general advice of this community is to avoid temp tables in favor of CTEs. However, I sometimes encounter situations in which CTE constructions are very slow, while their temp table...
View ArticleT SQL Cte Previous record calcuation
I'm using SQL Server 2016. I have the below table:SKU Shop Week ShopPrioirty Replen Open_Stk Open_Stk Calc111 100 1 1 0 17 NULL111 200 1 2 2 NULL NULL 111 300 1 3 0 NULL NULL111 400 1 4 0 NULL NULL222...
View ArticleIndex on a Computed Column(using udf)
I am trying to create a computed column using a udf. I keep hitting the cannot be persisted because the column does user or system data access, when i try creating a index for that column or even for...
View ArticlePostgreSQL skips WITH query
Consider this CTE:WITH division_by_zero AS ( SELECT 1/0)SELECT 42It returns 42 instead of raising an error. How can I force PostgreSQL to evaluate the SELECT 1/0?
View ArticleHow to improve poor performance with two joined CTE expressions on...
I have a table of hierarchical data where I want to select entries that, 1) only include matches that are descendants of a given parent, and 2) returns the full hierarchical path of the matched...
View ArticleSQL: Query to insert records into the table if there is not even one record...
I have a table train_statuses.With the schema as below:CREATE TABLE public.train_statuses ( id uuid NOT NULL, status text NOT NULL, updated_at timestamp without time zone NOT...
View ArticleAfter SQL restart, CTE causes invalid object name error for a short period in...
We have some SQL code that has been in production for some time, in a SQL Server 2016 database; but it is raising an error in a SQL Server 2019 database for the first hour or so after restarting SQL...
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Pivoting 4 by 44 result set
I have a SQL Server query that gets the sales data for a 44 store market chain, it includes 4 values for each store (Sales, COGS, GP and GP Margin), I declared a CTE and joined it 44 times for each...
View ArticleWant to delete then insert with single statement using a CTE in Postgres
I want to delete then insert with single statement using a CTE in Postgres. We could use an explicit transaction and 2 statements, but want to avoid that if possible. I don't know if there will be zero...
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What's the (Big O) computational complexity of a PostgreSQL recursive common...
For example, taking this StackOverflow #44620695 question, recursive path aggregation and CTE query for top-down tree postgres as an example, which uses a recursive CTE to traverse a tree structure to...
View ArticleUpdate Column from Recursive CTE (MySQL/MariaDB) [closed]
I need to update the same table I'm using to create a recursive cte. The cte works as a select statement, but I can't get it to actually insert those values back into the table.My code is below-...
View ArticleHow To Allocate 2+ Balances Across 2+ Timeslots, Without A Cursor
Please refer to the following schema at SQL Fiddle when reading the use case below.In a timekeeping application I'm working with, there is a business process where individuals are entitled to a...
View ArticleString manipulation in Recursive CTE
I am trying to make something like the following work:WITH results(n, string ) AS ( SELECT 1,'lol' UNION ALL SELECT n+1, string +' lol' FROM results WHERE n<6 ) SELECT * FROM resultsBut SQL doesn't...
View ArticleHow to make use of WITH in PostgreSQL to reduce query cost
I am trying to get twitter data of narendramodi using below command.SELECT b.t_id,a.profile_image,b.tweet_text,e.media_media_url,b.retweet_count,b.favorite_count as like_count,count(reply_to_status_id)...
View ArticleCTE To Use Alternate Select When Select Returns No Rows
I have created an involved CTE, with no recursion, but with multiple selects being done as it processes the business logic of the requirement. Though, I have been advised that the logic needed for the...
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