SQL | SOME

SQL | ALL and ANY
SOME operator evaluates the condition between the outer and inner tables and evaluates to true if the final result returns any one row. If not, then it evaluates to false.

  • The SOME and ANY comparison conditions are similar to each other and are completely interchangeable.
  • SOME must match at least one row in the subquery and must be preceded by comparison operators.

Syntax:

SELECT column_name(s)
FROM table_name
WHERE expression comparison_operator SOME (subquery)


Instructor Table:

Name Department Salary
Chandra Computational Biology 1
Visweswaran Electronics 1.5
Abraham Computer Science 1.3
John Electronics 1.2
Samantha Computer Science 2
Jyoti Electronics 1.2
Debarka Computer Science 2
Ganesh Computational Biology 0.9

Sample Queries and Outputs:

select name
from instructor
where Salary > some(select Salary
from instructor
where dept='Computer Science');

Output:

Visweswaran
Samantha
Debarka

Explanation
The instructors with salary > (salary of some instructor in the ‘Computer Science’ department) get returned. The salaries in the ‘Computer Science’ department are 1.3, 2 and 2. This implies any instructor with a salary greater than 1.3 can be included in the final result.

Exercise: Try to write same query using ANY clause.

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