SQL Operator 4

A wildcard character '_' means

How to select all record of Emp table where second letter of Country is 'O' and ends with 'ON'  ?

Which of the following returns distinct rows that are returned by the first query but not returned by the second.

Emp table contain this data

EMPNO       SAL
----- ----        ------
 7499          1600
 7521          8500
 7566          2975
 7654          1250
 7698          2850
 7782          2450
 7788          3000
 7839          5000

So what will be output for this query

SELECT empno, sal FROM   emp WHERE  sal > Any (2000, 3000, 4000);

In the above table  what will be output for this query

SELECT empno, sal FROM   emp WHERE  all> Any (2000, 3000, 4000);

In the above table what will output for

SELECT empno, sal  FROM   emp WHERE  sal > Some (2000, 3000, 4000);

Which of  the following is correct to  Select all  employees from EMP  whose empno is 7912, 7576, 7788 ?

Which of  the following is correct to select t he total salary with the commission of each employee ?

Which of  the following is correct selects all Employees with a Emp_Add containing the pattern "er" ?