Question

我有2个表：employee和employeedetails。

employee看起来像这样：

id      name
----------------
1       Suresh
2       Ram
3       Ravi

employeedetails看起来像这样：

empid    salary
----------------
1        10000
2        5000
3        40000

我想更新某个人的salary字段。为此，我知道第一个表的员工姓名。基于此，我需要编写一个查询，使用单个查询更新salary字段。我怎么能这样做？

例如，如果我必须更新Ravi的工资详情，我该如何在一个查询中完成？

Answer 1

update employeedetails 
inner join employee on employeedetails.empid = employee.id
set salary = 1000
where employee.name = 'Ram'

Answer 2

试试这个：

update employeedetails set salary=1000000 where empid in (select id from employee where name='suresh');

Answer 3

MERGE INTO employeedetails
   USING employee 
      ON employeedetails.empid = employee.id
         AND employee.name = 'Ravi'
WHEN MATCHED THEN
   UPDATE
      SET salary = 10000;

Answer 4

UPDATE employeedetails det 
SET salary=100 
WHERE EXISTS ( SELECT NULL 
               FROM employee emp 
               WHERE name='Ravi'
                 AND det.empid = emp.id 
             )
;

单个查询中的SQL更新

4 个答案: