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问题是将从事 5 个或 5 个以上项目的所有员工的工资更新 50%,30%(>=3 个项目),20%(>=1 个项目),项目数量由对 EMPLOYEE_PROJECT_HISTORY 执行分组查询;

我已经尝试过这些查询

update emp set emp.sal=
case 
when jemp.pcount >=5 then emp.sal+ (emp.sal*50)/100
when jemp.pcount >=3 then emp.sal+ (emp.sal*30)/100
when jemp.pcount >=1 then emp.sal+ (emp.sal*20)/100
else emp.sal+ (emp.sal*20)/100
end 
from employee emp join (select empno as jempno,count(projectno) as pcount from EMPLOYEE_PROJECT_HISTORY by empno) jemp on emp.empno=jemp.jempno ;

update employee a set a.sal= case (select count(b.projectno) as pcount from EMPLOYEE_PROJECT_HISTORY b group by b.empno ) 
    when b.pcount >5 then
    a.sal = a.sal+ (a.sal*50)/100
    when pcount >3 then
    a.sal = a.sal+ (a.sal*30)/100
    when pcount >1 then
    a.sal = a.sal+ (a.sal*20)/100
    end;
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1 回答 1

2

如果联接在 Oracle 中包含 GROUP BY 子句,您将无法更新联接。您可以使用内联子查询,如下所示:

UPDATE employee e
   SET sal = sal * (SELECT CASE
                              WHEN COUNT(*) >= 5 THEN
                               1.5
                              WHEN COUNT(*) >= 3 THEN
                               1.3
                              WHEN COUNT(*) >= 1 THEN
                               1.2
                              ELSE
                               1
                           END
                      FROM employee_project_history eph
                     WHERE eph.empno = e.empno);
于 2010-05-05T07:47:23.597 回答