subquery – Page 2 – CodeRavo

Selecting Distinct Rows Based on Multiple Columns in SQL

Introduction In relational databases, selecting distinct rows based on multiple columns is a common requirement when … Selecting Distinct Rows Based on Multiple Columns in SQLRead more

Aggregate Functions, anti-join, database performance, group by, null-handling, select-distinct, sql-update, subquery

Retrieving the Last Record from a Database Table using SQL

In this tutorial, we will explore how to retrieve the last record from a database table … Retrieving the Last Record from a Database Table using SQLRead more

database, fetch-first-clause, last-record, limit-clause, max, SQL, subquery, top-clause

Linking Events with Time-Based Conditions in MySQL: Advanced UPDATE Techniques

Introduction In relational database management, particularly with MySQL, managing data across tables often requires conditional updates … Linking Events with Time-Based Conditions in MySQL: Advanced UPDATE TechniquesRead more

conditional-update, Database Management, event-linking, join-operation, MySQL, subquery, update-query

Updating Data in One Table Based on Matches from Another Table

When working with databases, it’s common to need to update data in one table based on … Updating Data in One Table Based on Matches from Another TableRead more

database updating, MySQL, PostgreSQL, SQL join, SQL Server, subquery