In many database applications, it’s common to need to retrieve a limited number of top records … Retrieving Top Records by CategoryRead more
common-table-expressions
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
Comparing Multiple Columns using SQL
When working with databases, it’s often necessary to compare multiple columns between two tables. In this … Comparing Multiple Columns using SQLRead 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
Using Table Variables with Select Statements in T-SQL
In Transact-SQL (T-SQL), table variables are a type of temporary storage that can be used to … Using Table Variables with Select Statements in T-SQLRead more
Efficiently Splitting and Accessing Items from Delimited Strings in SQL Server
Introduction to String Manipulation in SQL Server In database management, there are often scenarios where data … Efficiently Splitting and Accessing Items from Delimited Strings in SQL ServerRead 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
Calculating Percentages with SQL Statements
Calculating percentages is a common task when analyzing data, and SQL provides various ways to accomplish … Calculating Percentages with SQL StatementsRead more