Question

我正在学习数据库查询，并希望从Oracle数据库中的HR Schema中找到以下SQL查询。

查找每个薪资组中的员工数量。薪资组被视为如下。

组1：0k至＆lt; 5K，5k至＆lt; 10k，10k至＆lt; 15k，等等。

可能的查询代码是什么？

表格如下：共有七个表格

REGIONS：REGION_ID, REGION_NAME
COUNTRIES：COUNTRY_ID, COUNTRY_NAME, REGION_ID
LOCATIONS：LOCATION_ID, STREET_ADDRESS, POSTAL_CODE, CITY, STATE_PROVINCE, COUNTRY_ID
DEPARTMENTS：DEPARTMENT_ID, DEPARTMENT_NAME, MANAGER_ID, LOCATION_ID
EMPLOYEES：EMPLOYEE_ID, FIRST_NAME, LAST_NAME, EMAIL, PHONE_NUMBER, HIRE_DATE, JOB_ID, SALARY, COMMISSION_PCT, MANAGER_ID, DEPARTMENT_ID
JOB_HISTORY：EMPLOYEE_ID, START_DATE, END_DATE, JOB_ID, DEPARTMENT_ID
JOBS：JOB_ID, JOB_TITLE, MIN_SALARY, MAX_SALARY

Answer 1

您将使用案例陈述来执行此操作。有点像：

SELECT
    CASE 
        WHEN salary BETWEEN 0 and 5000 THEN 'Group1'
        WHEN salary BETWEEN 5001 and 10000 THEN 'Group2'
        ... and on and on ...
        END as PayGroup
FROM
    <yourtable>

在冒险进一步冒险之前阅读基本的T-SQL命令可能是一个好主意，因为这就像SQL 101领域一样。

Answer 2

您能否提供一些有关您正在使用的数据库架构的详细信息？

确实存在哪些表格
他们有哪些栏目

我假设您想要输出

第1组：xx员工第2组：yy员工

这是正确的吗？好吧，这应该是它：

select 
    case
        when salary BETWEEN 0 and 5000 then "Group 1"
        when salary BETWEEN 5001 and 50000 then "Group 2"
        when salary BETWEEN 50001 and 500000 then "Group 3"
    end as salary_group, count(*) as employees_count
from employes group by salary_group

您当然可以更改号码和群组名称！

Answer 3

以下代码可以解决您的问题：

create table #temp
(
  EmpName nchar(10),
  EmpSal nchar(10)
)
insert into #temp(EmpName, EmpSal)
(select  
    EmpName,
        case
        when [EmpSalary] BETWEEN 0 and 5000 then 'Group1'
        when [EmpSalary] BETWEEN 5001 and 10000 then 'Group2'
        when [EmpSalary] BETWEEN 10001 and 15000 then 'Group3'
        when [EmpSalary] between 15001 and 20000 then 'Group4'
        end as [EmpSalary] 
     from [dbo].[Employee])

     select EmpSal, count(*) as 'Group by Salary Range' from #temp
     group by EmpSal

请根据您的要求更改列类型。

如何编写SQL查询以按工资范围对员工进行分组？

3 个答案: