Comparison Operatorsedit

Boolean operator for comparing against one or multiple expressions.

  • Equality (=)
SELECT last_name l FROM "test_emp" WHERE emp_no = 10000 LIMIT 5;
  • Null safe Equality (<=>)
SELECT 'elastic' <=> null AS "equals";

    equals
---------------
false
SELECT null <=> null AS "equals";

    equals
---------------
true
  • Inequality (<> or !=)
SELECT last_name l FROM "test_emp" WHERE emp_no <> 10000 ORDER BY emp_no LIMIT 5;
  • Comparison (<, <=, >, >=)
SELECT last_name l FROM "test_emp" WHERE emp_no < 10003 ORDER BY emp_no LIMIT 5;
  • BETWEEN
SELECT last_name l FROM "test_emp" WHERE emp_no BETWEEN 9990 AND 10003 ORDER BY emp_no;
  • IS NULL/IS NOT NULL
SELECT last_name l FROM "test_emp" WHERE emp_no IS NOT NULL AND gender IS NULL;
  • IN (<value1>, <value2>, ...)
SELECT last_name l FROM "test_emp" WHERE emp_no IN (10000, 10001, 10002, 999) ORDER BY emp_no LIMIT 5;