How does Max work in SQL?

Asked By: Aymar Heather | Last Updated: 29th June, 2020
Category: technology and computing databases
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SQL Server MAX() function is an aggregate function that returns the maximum value in a set. The MAX() function accepts an expression that can be a column or a valid expression. Similar to the MIN() function, the MAX() function ignores NULL values and considers all values in the calculation.

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Consequently, what does the MAX function do in SQL?

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.

One may also ask, what is the maximum value of the function? The maximum value of a function is the place where a function reaches its highest point, or vertex, on a graph. For instance, in this image, the maximum value of the function is y equals 5.

Likewise, how do you write a max function in SQL?

To get the maximum value of a numeric column use the MAX() function. SELECT MAX(<numeric column>) FROM <table>; SELECT MAX(<numeric column>) FROM <table> GROUP BY <other column>; To get the minimum value of a numeric column use the MIN() function.

Can we use max and count together in SQL?

It will be able to use MAX() on the COUNT() result from the first table, thus circumventing the direct use of two layered aggregate functions. The solution is to create a table to get the results from the inner function first, and then use this table for calling the second function on the respective column.

35 Related Question Answers Found

What is select Max in SQL?

Description. The SQL MAX function is used to return the maximum value of an expression in a SELECT statement.

How do I select the first 5 rows in SQL?

SQL SELECT TOP Clause
  1. SQL Server / MS Access Syntax. SELECT TOP number|percent column_name(s) FROM table_name;
  2. MySQL Syntax. SELECT column_name(s) FROM table_name. LIMIT number;
  3. Example. SELECT * FROM Persons. LIMIT 5;
  4. Oracle Syntax. SELECT column_name(s) FROM table_name. WHERE ROWNUM <= number;
  5. Example. SELECT * FROM Persons.

How do I limit the number of SQL results?

Limiting the Number of Results
  1. SQLite, PostgreSQL and MySQL. To limit the number of results returned, use the LIMIT keyword.
  2. MS SQL. To limit the number of results returned, use the TOP keyword.
  3. Oracle. To limit the number of results returned, use the ROWNUM keyword in a WHERE clause.
  4. Cheat Sheets. SQL Basics.

How do you sort in SQL?

The ORDER BY statement in sql is used to sort the fetched data in either ascending or descending according to one or more columns.
  1. By default ORDER BY sorts the data in ascending order.
  2. We can use the keyword DESC to sort the data in descending order and the keyword ASC to sort in ascending order.

IS NOT NULL SQL?


The IS NOT NULL condition is used in SQL to test for a non-NULL value. It returns TRUE if a non-NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

How do you join tables in SQL?

Different types of JOINs
  1. (INNER) JOIN: Select records that have matching values in both tables.
  2. LEFT (OUTER) JOIN: Select records from the first (left-most) table with matching right table records.
  3. RIGHT (OUTER) JOIN: Select records from the second (right-most) table with matching left table records.

What is an inner join SQL?

What is Inner Join in SQL? The INNER JOIN selects all rows from both participating tables as long as there is a match between the columns. An SQL INNER JOIN is same as JOIN clause, combining rows from two or more tables.

What are SQL functions?

Function is a database object in SQL Server. Basically, it is a set of SQL statements that accept only input parameters, perform actions and return the result. Function can return an only single value or a table.

How do you write a subquery?

Important Rule:
  1. A subquery can be placed in a number of SQL clauses like WHERE clause, FROM clause, HAVING clause.
  2. You can use Subquery with SELECT, UPDATE, INSERT, DELETE statements along with the operators like =, <, >, >=, <=, IN, BETWEEN, etc.
  3. A subquery is a query within another query.

What is the difference between where and having clause?


The main difference between WHERE and HAVING clause comes when used together with GROUP BY clause, In that case WHERE is used to filter rows before grouping and HAVING is used to exclude records after grouping.

What is an aggregate function in SQL?

Aggregate functions in SQL. In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning.

What is group by in SQL?

The GROUP BY Statement in SQL is used to arrange identical data into groups with the help of some functions. i.e if a particular column has same values in different rows then it will arrange these rows in a group. GROUP BY clause is used with the SELECT statement.

Can we use Max in where clause?

SQL MAX() with HAVING
The usage of WHERE clause along with SQL MAX() have also described in this page. The SQL IN OPERATOR which checks a value within a set of values and retrieve the rows from the table can also be used with MAX function.

What is Max in MySQL?

The MySQL MAX() function is an aggregate function that returns the maximum value from an expression. Typically, the expression would be a range of values returned as separate rows in a column, and you can use this function to find the maximum value from the returned rows.

How do you count in SQL?


The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows. The above syntax is the general SQL 2003 ANSI standard syntax.

How do you find the range?

Summary: The range of a set of data is the difference between the highest and lowest values in the set. To find the range, first order the data from least to greatest. Then subtract the smallest value from the largest value in the set.

What is the maximum in math?

Maximum, In mathematics, a point at which a function's value is greatest. If the value is greater than or equal to all other function values, it is an absolute maximum. In calculus, the derivative equals zero or does not exist at a function's maximum point.