SQL MAX() function
MAX() function
The aggregate function SQL MAX() is used to find the maximum value or highest value of a certain column or expression. This function is useful to determine the largest of all selected values of a column.
Syntax:
MAX ([ALL | DISTINCT] expression )
DB2 and Oracle Syntax:
MAX ([ALL | DISTINCT] expression ) OVER (window_clause)
Parameters:
Name | Description |
---|---|
ALL | Applies to all values. |
DISTINCT | Consider each unique value. DISTINCT is not meaningful with MAX function. |
expression | Expression made up of a single constant, variable, scalar function, or column name or any combination of arithmetic, bitwise, and string operators. MAX can be used with numeric, character, and datetime columns, but not with bit columns. Aggregate functions and subqueries are not permitted. |
DBMS Support: COUNT() function
DBMS | Command |
MySQL | Supported |
PostgreSQL | Supported |
SQL Server | Supported |
Oracle | Supported |
Syntax diagram - MAX() function

Example:
To get maximum 'ord_amout' from the 'orders' table, the following SQL statement can be used :
Sample table: orders
SELECT MAX (ord_amount)
FROM orders;
Relational Algebra Expression:

Relational Algebra Tree:

Output:
MAX(ORD_AMOUNT) --------------- 4500
Pictorial Presentation:

SQL MAX() with addition of two columns
To get the maximum value of (opening_amt+receive_amt) from the customer table, the following SQL statement can be used :
Sample table: customer
SELECT MAX (opening_amt+receive_amt)
FROM customer;
Relational Algebra Expression:

Relational Algebra Tree:

Output:
MAX(OPENING_AMT+RECEIVE_AMT) ---------------------------- 19000
Note: Outputs of the said SQL statement shown here is taken by using Oracle Database 10g Express Edition
Here is a slide presentation of all aggregate functions.
Check out our 1000+ SQL Exercises with solution and explanation to improve your skills.
Previous: Avg with round, group by
Next: Max with Group by, Order by
SQL: Tips of the Day
How to avoid the "divide by zero" error in SQL?
Select Case when divisor=0 then null Else dividend / divisor End ,,,
OR:
Select dividend / NULLIF(divisor, 0) ...
Ref: https://bit.ly/3dLj7gS
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook