How to Avoid N+1 Queries: Comprehensive Guide and Python Code Examples
This article describes the N+1 problem that we often find when developers use row by row solutions for querying related data in a database.
2023-06-21
4,805 reads
rohin daswani
An Overview of PostgreSQL Window Functions
This article looks at Window functions and how they can be used to solve problems in a different way from standard aggregate functions.
2023-02-24
6,080 reads
Nullable vs Non-Nullable Columns and Adding Not Null Without Downtime in PostgreSQL
In this article, we are going to talk about nullable and non-nullable columns specifically related to Postgres databases. While the reasons to use nullable or non-nullable columns may seem obvious at first, there are pitfalls associated with each decision that either affect development velocity, affect application performance, or cause downtime. Let's start with definitions. Nullable […]
2023-02-03
15,806 reads
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Question of the Day
Creating a JSON Document IV
I have this data in a table called dbo.NFLTeams
TeamID TeamName City YearEstablished ------ -------- ---- --------------- 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933 3 Packers Green Bay 1919 4 Chiefs Kansas City 1960 5 49ers San Francisco 1946 6 Broncos Denver 1960 7 Seahawks Seattle 1976 8 Patriots New England 1960If I run this code, how many rows are returned?
SELECT YearEstablished, json_objectagg(city : TeamName) FROM dbo.NFLTeams GROUP BY YearEstablished;See possible answers