• The SQL MAX function is used to return the maximum value of an expression in a SELECT statement.
• In other words, SQL MAX function is used to find out the record with maximum value among a record set.

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Syntax

• The syntax for the MAX function is,

SELECT MAX (<expression>)
FROM "table_name";

• can be a column name or an arithmetic operation. An arithmetic operation can include more than one column, such as ("column1" + "column2").
• It is also possible to have one or more columns in addition to the MAX function in the SELECT statement. In those cases, these columns need to be part of the GROUP BY clause as well:

SELECT "column_name1", "column_name2", ... "column_nameN", MAX (<expression>)
FROM "table_name";
GROUP BY "column_name1", "column_name2", ... "column_nameN";

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Examples

• We use the following table for our examples.

Table Store_Information

Store_Name	Sales	Txn_Date
Los Angeles	1500	Jan-05-1999
San Diego	250	Jan-07-1999
Los Angeles	300	Jan-08-1999
Boston	700	Jan-08-1999

Example 1: MAX function on a column

• To find the maximum sales amount, we type in,

SELECT MAX(Sales) FROM Store_Information;

Result:

MAX(Sales)
1500

• 1500 represents the maximum value of all Sales entries: 1500, 250, 300, and 700.

Example 2: MAX function on an arithmetic operation

• Assume that sales tax is 10% of the sales amount, we use the following SQL statement to get the maximum sales tax amount:

SELECT MAX(Sales*0.1) FROM Store_Information;

Result:

MAX(Sales*0.1)
150

• SQL will first calculate "Sales*0.1" and then apply the MAX function to the result for the final answer.

Example 3: MAX function with a GROUP BY clause

• To get the maximum sales amount for each store, we type in,

SELECT Store_Name, MAX(Sales) FROM Store_Information GROUP BY Store_Name;

Result:

Store_Name	MAX(Sales)
Los Angeles	1500
San Diego	250
Boston	700

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SQL Exercise Aggregate Function Having MAX

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