The difference between any and all in mysql

In MySQL, ANY checks whether any row returned by the subquery satisfies the condition, while ALL checks whether all rows returned by the subquery satisfy the condition. For example, ANY finds students who have at least one grade above 90, while ALL finds students who have only grades above 90 in all courses.

The difference between ANY and ALL in MySQL

In MySQL, ANY and ALL are used for aggregate queries Keyword used to check whether the value returned by a subquery meets specific conditions. The main difference between them is:

ANY

• Check whether any row returned by the subquery satisfies the condition.
If the subquery returns
• at least one row that satisfies the condition, the condition of the main query returns true.

ALL

Check whether all
• rows returned by the subquery meet the conditions. The condition of the main query returns true only when
all rows
• returned by the subquery satisfy the condition.

Example

Suppose we have a student grade table with the following fields:

student_id
• : Student ID
name
• : Student name
course_id
• : Course ID
grade
• : Score
To find all students with a score higher than 90, we can use the following query:

SELECT name
FROM students
WHERE ANY (SELECT grade FROM grades WHERE student_id = students.student_id) > 90;

This query will return all students with at least one subject with a score higher than 90 name.

To find only students who have grades above 90 points in all courses, we can use the following query:

SELECT name
FROM students
WHERE ALL (SELECT grade FROM grades WHERE student_id = students.student_id) > 90;

This query will return only students whose grades are above 90 points in all courses Name.

Summary

ANY
• Check whether any row of the subquery satisfies the condition.
ALL
• Check whether all rows of the subquery meet the conditions.

The above is the detailed content of The difference between any and all in mysql. For more information, please follow other related articles on the PHP Chinese website!