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