Error in SQL query

Hi,

I am new to SQL. But i have logic with me.

How to assign select query to variable?

I am trying below code and its giving error.

What i want to achieve is i want to calculate SUM(SALARY) and COUNT(SALARY) and then divide the both.

something like that in lehman language.

:var1 = select sum(salary) from dummy;

:var2 = select count(salary) from dummy group by ID;

:var3 = :var1/:var2.

But i am facing syntax issues. can someone help?

declare var_sum int;

:var_sum = select sum("SALARY") as "Sum_Salary",

          from "Sumeet"."EMPLOYEE"

        group by "REGION";

SAP DBTech JDBC: [257]: sql syntax error: incorrect syntax near ":var_sum": line 1 col 1 (at pos 1)