In many database applications, it’s common to need to retrieve a limited number of top records … Retrieving Top Records by CategoryRead more
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Insert or Update: Mastering UPSERT in PostgreSQL
In many applications, you need to insert new data into a table while updating existing records … Insert or Update: Mastering UPSERT in PostgreSQLRead more
Updating Table Rows with Subqueries in PostgreSQL
PostgreSQL provides several ways to update table rows using subqueries. This tutorial will cover the different … Updating Table Rows with Subqueries in PostgreSQLRead more
Declaring Variables in PostgreSQL Queries
In PostgreSQL, declaring variables can be a bit different than in other SQL databases. Unlike some … Declaring Variables in PostgreSQL QueriesRead more
Understanding and Using SQL's `ROW_NUMBER()` Function
Introduction to ROW_NUMBER() In SQL, particularly with window functions introduced in SQL Server 2005, ROW_NUMBER() is … Understanding and Using SQL's `ROW_NUMBER()` FunctionRead more