01 SQL核心语句

核心语句

1:  insert all

2:      when sum_orders < 10000 then

3:          into small_customers

4:      when sum_orders >= 10000 and sum_orders < 100000 then

5:          into medium_customers

6:      else

7:          into large_customers

8:  select customer_id, sum(order_total) sum_orders

9:  from oe.orders

10:  group by customer_id;

11:

12:  -- 注意上例是仿照

13:  insert into scott.bonus(ename, job, sal)

14:  select ename, job, sal from scott.emp;

1:  update employees2

2:  set (salary, first_name) = ( select salary * 10, last_name

3:                                   from employees

4:                               where employees.employee_id = employees2.employee_id)

5:  where department_id = 90;

1:  delete from (select * from employees2 where department_id = 90);