条件单SQL查询插入

Question

假设我有一个名为：

的TABLE

 EMP(Eid,Ename,ESalary)

现在我必须编写一个将更新的查询：

if employee's salary >= 20000 then increment 25% else update 15% salary

Answer 1

update EMP
   set ESalary = CASE WHEN salary >= 20000
                      THEN salary * 1.25
                      ELSE salary * 1.15
                      END;

Answer 2

试试这个：

update emp a set esalrary = 
(select (case when esalary >=20000 then esalary+(esalary*25/100) 
else  esalary+(esalary*25/100) end) from emp b where a.eid=b.eid);