Sql 我有一个问题，但它没有'；不行。我怎样才能写对呢？

总共有三张桌子。我编写了下面的查询来合并这三个表。我想编写一个sql语句来显示在IT部门工作并获得高于平均工资的员工。我的发言如下。但是当语句运行时，我得到一个“未找到数据”警告。我怎样才能写得正确

`select 
 e.FIRST_NAME 
,e.LAST_NAME
,c.DEPARTMENT_NAME
,l.CITY
,l.STATE_PROVINCE
,k.COUNTRY_NAME
,e.SALARY 
 from hr.employees e join hr.departments c on (c.DEPARTMENT_ID=e.DEPARTMENT_ID) 
 join hr.locations l on (c.LOCATION_ID=l.LOCATION_ID) 
 join hr.countries k on (k.COUNTRY_ID=l.COUNTRY_ID) where DEPARTMENT_NAME='IT' 
 and SALARY in (select SALARY from hr.employees group by SALARY having SALARY > AVG(SALARY));`

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请尝试以下公司的平均工资：

select 
 e.FIRST_NAME 
,e.LAST_NAME
,c.DEPARTMENT_NAME
,l.CITY
,l.STATE_PROVINCE
,k.COUNTRY_NAME
,e.SALARY 
 from hr.employees e join hr.departments c on (c.DEPARTMENT_ID=e.DEPARTMENT_ID) 
 join hr.locations l on (c.LOCATION_ID=l.LOCATION_ID) 
 join hr.countries k on (k.COUNTRY_ID=l.COUNTRY_ID) where DEPARTMENT_NAME='IT' 
 and SALARY > (select avg(SALARY) from hr.employees);

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和薪资>（选择平均薪资）…赚取高于平均薪资的薪资-IT部门平均薪资还是公司平均薪资？我使用的是公司平均薪资