조건문(if문, case문)

제어문 : 조건문, 반복문

- 조건문 : if문, case문

- 반복문 : basic loop문, while문(반복횟수를 정하지 않을 경우)

  for문(반복횟수를 지정할 경우)

//if문 : if~end if문

  if(조건) then

실행명령;

  end if;

declare
    emp_id employees.employee_id%type;
    emp_name employees.last_name%type;
    emp_dept employees.department_id%type;
    dept_name varchar2(20) := null;
begin
    select employee_id, last_name, department_id
    into emp_id, emp_name, emp_dept
    from employees
    where employee_id = 124;
 
    if(emp_dept = 50) then  --if문 시작
        dept_name := 'Shipping';
    end if;
    
    if(emp_dept = 60) then  
        dept_name := 'IT';
    end if;
 
    if(emp_dept = 70) then  
        dept_name := 'Public Relation';
    end if;
 
    if(emp_dept = 80) then  
        dept_name := 'Sales';
    end if;
 
    dbms_output.put_line(emp_id || ' ' || emp_name || ' ' || emp_dept || ' ' || dept_name);
 
end;
    

declare
    emp_id employees.employee_id%type;
    emp_name employees.last_name%type;
    emp_dept employees.department_id%type;
    dept_name varchar2(20) := null;
begin
    select employee_id, last_name, department_id
    into emp_id, emp_name, emp_dept
    from employees
    where employee_id = 124;
 
    if(emp_dept = 50) then
        dept_name := 'Shipping';
    elsif(emp_dept = 60) then
        dept_name := 'IT';
    elsif(emp_dept = 70) then
        dept_name := 'Public Relation';
    elsif(emp_dept = 80) then
        dept_name := 'Sales';
    end if;
 
    dbms_output.put_line(emp_id || ' ' || emp_name || ' ' || emp_dept || ' ' || dept_name);
end;

※ PL/SQL에서는 else if -> elsif

declare
    emp_id employee.employee_id%type;
    emp_name employee.last_name%type;
    emp_comm employee.commission_pct%type := null;
begin
    select employee_id, last_name, commission_pct
    into emp_id, emp_name, emp_comm
    from employee
    where employee_id = 130;
 
    if(emp_comm > 0) then
        dbms_output.put_line(emp_id || '의 보너스는 ' || emp_comm ||'입니다.');
    else
        dbms_output.put_line('보너스가 없다');
    end if;
 
end;

case문

declare
    emp_id employees.employee_id%type;
    emp_name employees.last_name%type;
    emp_dept employees.department_id%type;
    dept_name varchar2(20) := null;
begin
    select employee_id, last_name, department_id
    into emp_id, emp_name, emp_dept
    from employees
    where employee_id = &empno;
    dept_name := case emp_dept
                 when 50 then 'Shipping'
                 when 60 then 'IT'
                 when 70 then 'Public Relation'
                 when 80 then 'Sales'
                 end;
 
    dbms_output.put_line(emp_dept);
end;