Advanced SQL FAANG Interview Questions Explained | SQL Interview Question no 15 | Daily SQL Practice

Pubblicato il: 27 ottobre 2024
sul canale di: The Data -Tech Club

510

Discover the key differences between ROW_NUMBER and DENSE_RANK functions in SQL Server! In this video, we'll dive into how each function works, their unique applications, and when to use them effectively. Learn how ROW_NUMBER assigns a unique sequence to each row within a partition, and how DENSE_RANK handles ties, ensuring consecutive rankings. Whether you're preparing for an interview, handling complex data analysis, or simply refining your SQL skills, this guide will help you understand and apply these ranking functions for maximum efficiency. Perfect for SQL Server users aiming to boost their query performance and data sorting strategies!
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------------------Table Script------------------------------------
create table test (balance number, txn_date date);

insert into test values (27000, '01-JAN-2023');
insert into test values (27000, '02-JAN-2023');
insert into test values (27000, '03-JAN-2023');
insert into test values (31000, '04-JAN-2023');
insert into test values (31000, '05-JAN-2023');
insert into test values (27000, '06-JAN-2023');
insert into test values (27000, '07-JAN-2023');
insert into test values (32000, '08-JAN-2023');
insert into test values (31000, '09-JAN-2023');

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