MySQL Having Clause

by Online Tutorials Library July 14, 2022

MySQL HAVING Clause

MySQL HAVING Clause is used with GROUP BY clause. It always returns the rows where condition is TRUE.

Syntax:
SELECT expression1, expression2, … expression_n, aggregate_function (expression) FROM tables [WHERE conditions] GROUP BY expression1, expression2, … expression_n HAVING condition;

Parameters

aggregate_function: It specifies any one of the aggregate function such as SUM, COUNT, MIN, MAX, or AVG.

expression1, expression2, … expression_n: It specifies the expressions that are not encapsulated within an aggregate function and must be included in the GROUP BY clause.

WHERE conditions: It is optional. It specifies the conditions for the records to be selected.

HAVING condition: It is used to restrict the groups of returned rows. It shows only those groups in result set whose conditions are TRUE.

HAVING Clause with SUM function

Consider a table “employees” table having the following data.

Here, we use the SUM function with the HAVING Clause to return the emp_name and sum of their working hours.

Execute the following query:

 SELECT emp_name, SUM(working_hours) AS “Total working hours” FROM employees GROUP BY emp_name HAVING SUM(working_hours) > 5; 

Simply, it can also be used with COUNT, MIN, MAX and AVG functions.

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MySQL Having Clause

MySQL HAVING Clause

Syntax: SELECT expression1, expression2, … expression_n, aggregate_function (expression) FROM tables [WHERE conditions] GROUP BY expression1, expression2, … expression_n HAVING condition;

Parameters

HAVING Clause with SUM function

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Syntax:
SELECT expression1, expression2, … expression_n, aggregate_function (expression) FROM tables [WHERE conditions] GROUP BY expression1, expression2, … expression_n HAVING condition;