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 DML:Data Manipulation Language Êý¾Ý²Ù×÷ÓïÑÔ
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1. insertÓï¾ä
(1) ´ÓÆäËü±íÖи´ÖÆÊý¾Ý,ʵÏÖ·½·¨:ÔÚinsert Óï¾äÖмÓÈë²éѯÓï¾ä
insert into sales_reps(id,name,salary,commission_pct)  select employee_id,last_name,salary,commission_pct
from employees where job_id like '%rep';
(2) updateÖÐʹÓÃ×Ó²éѯ
 update employees set job_id =  (select job_id from employees where employee_id = 205),
                               salary =  (select salary from employees where employee_id = 205)
           where employee_id = 114;
   È磺¸üÐÂ114ºÅÔ±¹¤µÄ¹¤×÷ºÍ¹¤×ÊʹÆäÓë205ºÅÔ±¹¤Ïàͬ
   update employees set job_id =  (select job_id from employees where employee_id = 205),
      salary = (select salary from employees where employee_id = 205)
      where employee_id = 114
   ÔÙ¿´Ò»¸öÎÊÌ⣬×ÐϸÌå»á½â¾ö²½Ö裺
    ¸ü¸Ä 108 Ô±¹¤µÄÐÅÏ¢: ʹÆä ¹¤×ʱäΪËùÔÚ²¿ÃÅÖеÄ×î¸ß¹¤×Ê£¬job±äΪ¹«Ë¾ÖÐƽ¾ù¹¤×Ê×îµÍµÄjob
     ·ÖÎö£º
 µÚ1 ²½ Ê×ÏȲéѯ 108 ËùÔÚ²¿ÃŵÄ×î¸ß¹¤×ÊÊǶàÉÙ
    select max(salary) from employees where department_id =
  ( select department_id from employees where employee_id = 108)
 µÚ 2 ²½ ²éѯ¹«Ë¾ÖÐƽ¾ù¹¤×Ê×îµÍµÄ job_id
     select job_id from employees group by job_id having avg(salary) =
     (select min(avg_sal) from(select avg(salary) avg_sal from employees  group by job_id) )
 µÚ 3 ²½ ʵÏÖ¸üÐÂ
          update employees set salary = (  select max(salary) from employees 
             where department_id =


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