oracle ±Ê¼Ç II Ö®DML:Êý¾Ý²Ù×÷ÓïÑÔ
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
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¸ü¸Ä 108 Ô±¹¤µÄÐÅÏ¢: ʹÆä ¹¤×ʱäΪËùÔÚ²¿ÃÅÖеÄ×î¸ß¹¤×Ê£¬job±äΪ¹«Ë¾ÖÐƽ¾ù¹¤×Ê×îµÍµÄjob
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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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