oracle - in sql merge syntax how to pass userparameter -

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i getting error:bind variable "a" not declared

merge emp e1 using  (select e2.empno,e2.sal emp2 e2 e2.empno=:a) on (e1.empno=e2.empno) when matched update set e1.sal=e2.sal when not matched insert values(e2.empno,e2.ename,e2.job,e2.mgr,e2.hiredate,e2.sal,e2.comm,e2.deptno);

if you're in sql*plus (as suspect error message given), 

variable number exec :a := 5

before try run merge statement.

on other hand, if you're running statement in pl/sql, there no need use colon, instead, place variable name instead:

procedure do_the_merge(a in number) begin    merge....          ....       e2.empno =         ....;  end do_the_merge;

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