查询多个条件

Question

I want to display the salary from my employees table where the salary has to be between 6100 and 6400, and first_name is like a%.

I wrote this query :

select salary from employees where salary in (6100,6400) and first_name like 'a%';

But it shows no rows selected. How should I change the query to find rows that match both conditions?

Answer 1

Use BETWEEN instead of IN :

SELECT salary 
FROM employees 
WHERE salary BETWEEN 6100 AND 6400
  AND first_name LIKE 'a%';

Answer 2

Use BETWEEN this way

select salary 
from employees 
where salary BETWEEN 6100 AND 6400 
and first_name like 'a%';

Answer 3

Because you're using the IN statement rather than the BETWEEN statement, the data returned by your current query would only contain employee's with salaries equal to 6100 or 6400 and a first name starting with the lower case letter 'a'.

Please try the following:

SELECT SALARY
FROM EMPLOYEES
WHERE SALARY BETWEEN 6100 AND 6400
AND FIRST_NAME LIKE 'a%';