Plsql 使用having count的PL/SQL更新率
你好,我是pl/sql的新手 我需要更新所有少于5名员工到500名员工的项目的每小时费率 这是我写的代码,但它更新了所有员工Plsql 使用having count的PL/SQL更新率,plsql,count,having,Plsql,Count,Having,你好,我是pl/sql的新手 我需要更新所有少于5名员工到500名员工的项目的每小时费率 这是我写的代码,但它更新了所有员工 set serveroutput on declare cursor rate_cur is select * from project for update of rate_per_hour; begin for rate_rec IN rate_cur loop update project set rate_per_hour=5
set serveroutput on
declare
cursor rate_cur is
select * from project
for update of rate_per_hour;
begin
for rate_rec IN rate_cur
loop
update project
set rate_per_hour=500
where current of rate_cur;
end loop;
end;
这是我的桌子:
CREATE TABLE employee(
empid number(5),
empname varchar(20),
address varchar(20),
no_of_dependents number(5),
deptno number(5),
CONSTRAINT EMPLOYEE_PKEY PRIMARY KEY(empid),
CONSTRAINT EMPLOYEE_FKEY FOREIGN KEY(deptno) REFERENCES department(deptno));
CREATE TABLE project(
projectno number(5),
location varchar(20),
incharge number(5),
rate_per_hour number(5),
CONSTRAINT PROJECT_PKEY PRIMARY KEY(projectno),
CONSTRAINT PROJECT_FKEY FOREIGN KEY(incharge) REFERENCES employee(empid));
CREATE TABLE assignment(
empid number(5),
projectid number(5),
hours number(5),
CONSTRAINT ASSIGNMENT_FKEY FOREIGN KEY(empid) REFERENCES employee(empid),
CONSTRAINT ASSIGNEMNT_FKEY2 FOREIGN KEY(projectid) REFERENCES project(projectno));
Please suggest a solution
它会更新所有项目,因为您正在无限制地选择所有项目。您可以将光标更改为以下内容:
declare
cursor RATE_CUR is
select P.PROJECTNO, count(*) as EMP_CNT
from PROJECT P
join ASSIGNMENT A
on A.PROJECTID = P.PROJECTNO
group by PROJECTNO
having count(*) < 5;
begin
for RATE_REC in RATE_CUR loop
update PROJECT
set RATE_PER_HOUR = 500
where PROJECTNO = RATE_REC.PROJECTNO;
end loop;
end;
我在其他论坛上找到了帮助!这是密码
update project
set rate_per_hour = 500
where projectno IN
(select projectid
from assignment
group by projectid
having count(distinct empid) <5);
不允许更新此查询表达式的FOR。即使删除更新并更改行|其中projectno=rate\u cur.projectno |到|其中prokectno=rate\u rec.projectno | rate\u cur.PROJEC\u TNO:无效标识我编辑它以修复这些拼写错误。您从另一个论坛获得的解决方案更好,因为它只是纯SQL,我的目标是修复您的PL/SQL。