PostgreSQL ALL Operator

The ALL operator in PostgreSQL compares a value against all elements of an array. This operator is used to checks the strict condition. For example, consider a hiring process where a candidates scores must be above a certain level. Then use the ALL operator to filter the strong candidates.

Syntax

Following is the syntax of ALL operators in PostgreSQL −

expression operator ALL (array | subquery)

Here,

• "expression" is the value to compare, operator is a comparison sign (=, <, >, <=, >=, <>), and array contains multiple values.

Example of ALL Operator in PostgreSQL

Here, we create one table name of students which stores the records of rows and columns. Our target is only to filter strong candidates.

Step 1: Start with CREATE TABLE and the put the values using INSERT INTO.

CREATE TABLE students (
    id SERIAL PRIMARY KEY,
    name TEXT,
    age INT,
    experience INT,
    skills TEXT[],
    scores INT[]
);

INSERT INTO students (name, age, experience, skills, scores) VALUES
('Radha', 28, 5, ARRAY['Python', 'SQL'], ARRAY[85, 90, 95]),
('Sarika', 32, 7, ARRAY['Java', 'PostgreSQL'], ARRAY[88, 92, 99]),
('Revathi', 24, 2, ARRAY['Go', 'SQL'], ARRAY[60, 75, 80]),
('Raman', 30, 6, ARRAY['C++', 'Python'], ARRAY[70, 85, 88]),
('Akshita', 27, 4, ARRAY['Swift', 'SQL'], ARRAY[55, 65, 70]),
('Farhan', 35, 10, ARRAY['Ruby', 'JavaScript'], ARRAY[95, 98, 100]);

Step 2: Use the ALL Operator to filter the result.

Query I: Find students whose all scores are greater than 80.

SELECT name, scores FROM candidates WHERE 80 < ALL (scores);

The first query produces the following result −

SELECT name FROM candidates WHERE 90 <= ALL (scores);