elasticsearch/docs/reference/query-languages/sql/sql-operators.md

mapped_pages
https://www.elastic.co/guide/en/elasticsearch/reference/current/sql-operators.html

Comparison operators [sql-operators]

Boolean operator for comparing against one or multiple expressions.

Equality (=) [sql-operators-equality]

SELECT last_name l FROM "test_emp" WHERE emp_no = 10000 LIMIT 5;

Null safe Equality (<=>) [sql-operators-null-safe-equality]

SELECT 'elastic' <=> null AS "equals";

    equals
---------------
false

SELECT null <=> null AS "equals";

    equals
---------------
true

Inequality (<> or !=) [sql-operators-inequality]

SELECT last_name l FROM "test_emp" WHERE emp_no <> 10000 ORDER BY emp_no LIMIT 5;

Comparison (<, <=, >, >=) [sql-operators-comparison]

SELECT last_name l FROM "test_emp" WHERE emp_no < 10003 ORDER BY emp_no LIMIT 5;

BETWEEN [sql-operators-between]

SELECT last_name l FROM "test_emp" WHERE emp_no BETWEEN 9990 AND 10003 ORDER BY emp_no;

IS NULL/IS NOT NULL [sql-operators-is-null]

SELECT last_name l FROM "test_emp" WHERE emp_no IS NOT NULL AND gender IS NULL;

IN (<value1>, <value2>, ...) [sql-operators-in]

SELECT last_name l FROM "test_emp" WHERE emp_no IN (10000, 10001, 10002, 999) ORDER BY emp_no LIMIT 5;