How do you write ordered multi-inserts wih CTEs?
With the table like this:CREATE TABLE test_1 ( id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY);CREATE TABLE test_2 ( id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY);CREATE TABLE test_refs ( id...
View ArticlePostgreSQL seems to ignore RAISE EXCEPTION in a CTE
Using PostgreSQL 9.3 I have been trying to define an assert helper function to check for empty query results and similar things as follows:CREATE FUNCTION public.assert ( in_assertion boolean,...
View ArticleCTE Performance with a large table
I have two tables - Sites (<100k records) and Visitors (>50 mil records). The queries below produce identical results, but the first one takes 150 milliseconds, and the second takes over a...
View ArticleHow to perform dummy multi-inserts with generate_series()?
Given the tables like this: https://dbfiddle.uk/Z8hOhnYGCREATE TABLE accounts ( id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,);CREATE TABLE profiles ( id bigint GENERATED ALWAYS AS IDENTITY...
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Generate dynamic number of columns from CTE
A hospital database (SQL Server 2016) has a table of visits to the hospital. If patients transfer to a different specialty, a new visit is made (but from a research perspective it's considered one...
View ArticleHow to order by cumulative value?
In my application widgets move step by step through a workflow. I want to list the widgets ordered by their step due-dates but I can't figure out how to do that.There are many workflows. Each workflow...
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