Finding Last Value In a Table Or Column | SQL Intermediate Level Interview Question

Pubblicato il: 28 luglio 2024
sul canale di: Select Star

299

Namastey All,

Welcome to Select Star.

Today I will be solving one medium (or intermediate) level SQL interview question.

Topics covered :

1. ROW NUMBER WINDOW Function : How to use rank function for creating a primary key
2. FIRST VALUE Function : first_value(column_name) : Retrieves first value from a partitioned and ordered data
3. LAST VALUE Function : last_value(column_name) : Retrieves last value from a partitioned and ordered data
4. Common table expression (commonly known as cte or ctes) : Helps in simplifying queries, building blocks of a SQL query.
5. Using ORDER BY and LIMIT function to achieve required resuls
6. Difference between first value and last value window functions
7. Why you should be careful while using LAST VALUE function : Explained
OR
Why to avoid LAST VALUE function : Explained
8. Range of window functions explained
9. Meaning of terms like UNBOUNDED, PRECEDING, FOLLOWING explained
10. Requirement of a PRIMARY KEY in a table.

Script for table creation :

select * from t1;

create table t1 (
id int,
name varchar(20),
age int,
dates date);

insert into t1 values
(1, null, 50, '2023-01-01'),
(2, null, 30, null),
(3, 'Michael', null, null),
(null, null, 40, null),
(4, null, null, null);

Link for other questions :

1. • Finding First Login Time In 3 Ways | SQL I...

2. • Count New and Old Users | Merge Data In a ...

Happy Querying

#sql #data #dataanalytics #dataanalyst #analysis #analyst #dataengineers #dataengineering #machinelearning #datascience #datascientist #machinelearningengineer #businessanalyst #businessanalyticsjobs #businessanalytics #sqlserver #sqltips #sqlforbeginners #postgres #postgresql #mssqlserver #mssql #oracle #mysql #mysqltutorials #database #databasedesign #databasemanagement

In questa pagina del sito puoi guardare il video online Finding Last Value In a Table Or Column | SQL Intermediate Level Interview Question della durata di ore minuti seconda in buona qualità , che l'utente ha caricato Select Star 28 luglio 2024, condividi il link con amici e conoscenti, su youtube questo video è già stato visto 299 volte e gli è piaciuto 12 spettatori. Buona visione!

1,614