window-functions – CodeRavo

Understanding SQL `PARTITION BY` for Window Functions

Introduction to SQL PARTITION BY The PARTITION BY keyword is part of SQL’s window functions, a … Understanding SQL `PARTITION BY` for Window FunctionsRead more

Aggregate Functions, count, data analysis, over-clause, partition-by, SQL, window-functions

Retrieving Top Records by Category

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, ctes, partition-by, rank, row-number, SQL, window-functions

Retrieving Maximum Value Rows per Group

Retrieving Maximum Value Rows per Group A common data manipulation task involves extracting rows that correspond … Retrieving Maximum Value Rows per GroupRead more

data-retrieval, database, group by, maximum-value, oracle, query optimization, self-join, SQL, subquery, window-functions

Removing Duplicate Rows in Oracle Databases

Identifying and Removing Duplicate Data Duplicate data can creep into any database over time, causing issues … Removing Duplicate Rows in Oracle DatabasesRead more

data integrity, Database Management, delete, duplicate-data, oracle, rowid, SQL, sql-query, window-functions

Identifying and Selecting Duplicate Records Based on Multiple Fields in SQL

When working with databases, a common task is to identify duplicate records based on specific fields. … Identifying and Selecting Duplicate Records Based on Multiple Fields in SQLRead more

duplicates, group by, having, partitioning, rank, row-number, SQL, window-functions

Understanding SQL Aggregation: Selecting Maximum Values and Handling Non-Aggregated Columns

Introduction In relational databases, aggregating data is a common task used to summarize information. One of … Understanding SQL Aggregation: Selecting Maximum Values and Handling Non-Aggregated ColumnsRead more

distinct-on, group-by-clause, join(), max-function, sql-aggregation, subquery, window-functions

Calculating Median Values in SQL Server: Techniques and Considerations

Introduction In SQL, calculating statistical measures such as medians is a common requirement for data analysis. … Calculating Median Values in SQL Server: Techniques and ConsiderationsRead more

Aggregate Functions, median-calculation, ntile, offset-fetch, percentile-cont, performance optimization, SQL Server, window-functions

Optimizing SQL Queries to Display a Single Line Item per Order

When working with databases, particularly those involving order and inventory systems, you may encounter scenarios where … Optimizing SQL Queries to Display a Single Line Item per OrderRead more

Aggregate Functions, cross-apply, database-queries, query optimization, SQL Server, sql-subqueries, window-functions

Retrieving the Last N Rows in SQL Server

Introduction Frequently, when working with databases, you’ll need to retrieve only the most recent entries – … Retrieving the Last N Rows in SQL ServerRead more

database, last-n-rows, order-by, performance, queries, row-number, SQL Server, top, window-functions