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SQL MAX function
SQL MAX function is used to return the maximum value of an expression in the SELECT operator.
Syntax for MAX function in SQL
SELECT MAX(aggregate_expression_id)
FROM tabs
[WHERE conds]
Or the syntax for the MAX function when grouping results into one or more columns.
SELECT expression1_id, expression2_id, ... expression_n_id,
MAX(aggregate_expression_id)
FROM tabs
[WHERE conds]
GROUP BY expression1_id, expression2_id, ... expression_n_id;
where:
- expression1_id, expression2_id, …_n_id – Expressions that are not encapsulated in the MAX function and must be included in the GROUP BY offer at the end of the SQL query
- aggregate_expression_id – This is the column or expression from which the maximum value will be returned
- tabs – The tables from which you want to get the records. The FROM sentence must contain at least one table
- WHERE conds – Optional. These are the conditions that must be met to select records
Example with one expression
The easiest way to use an SQL function MAX is to return a single field that calculates the value of MAX.
For example, you can find out the maximum salary of all employees.
SELECT MAX(salary_id) AS "Highest salary_id".
FROM empls;
In this example of the MAX SQL function we have specified the alias “Highest salary_id” to the expression MAX(salary_id). As a result, “Highest salary_id” will be displayed as a field name when returning the result set.
Using SQL statement GROUP BY
In some cases you will need to use the GROUP BY SQL statement with the SQL MAX function.
For example, you can also use the SQL function MAX to return the name of each department and the maximum salary in the department.
SELECT department_id, MAX(salary_id) AS "Highest salary_id".
FROM empls
GROUP BY department_id;
| Since you specified one column in SQL statement SELECT, which is not encapsulated in the MAX function, you must use the SQL statement GROUP BY. |
Therefore, the field department must be specified in the section GROUP BY.
Sql Training Online – Sql Max Function
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