如何通過特定組SQL

Question

訂購我有一個要求，這樣的查詢：

顯示在後續作業的順序排列的所有細節員工：董事，監事，ENGINEER和祕書。

僱員表結構是這樣的：

（EMPLOYEE_ID，名字，姓氏，JOB_ID）

作業片劑結構是這樣的：

（JOB_ID，JOB_TITLE， Min_Salary，Max_Salary）

如何按特定組進行分組？

非常感謝。

Answer 1

select case 
     when job_title = 'DIRECTOR' then 
      1 
     when job_title = 'SUPERVISOR' then 
      2 
     when job_title = 'ENGINEER' then 
      3 
     when job_title = 'CLERK' then 
      4 
     else 
      0 
     end as seq, 
     employees.*, 
     jobs.* 
    from employees 
    join jobs 
    on employees.job_id = jobs.job_id 
order by 1 

Answer 2

如果你正在使用MySQL（所暗示的「mysqli的」標籤），然後使用字段功能：

SELECT e.* 
FROM Employee e INNER JOIN 
    Job J 
    ON J.Job_ID = E.Job_ID 
ORDER BY field(J.Job_Title, 'DIRECTOR', 'SUPERVISOR', 'ENGINEER', 'CLERK'); 

Answer 3

select 
     * 
    from employees employees 
    join jobs jobs 
    on employees.job_id = jobs.job_id 
order by case 
     when job_title = 'DIRECTOR' then 
      1 
     when job_title = 'SUPERVISOR' then 
      2 
     when job_title = 'ENGINEER' then 
      3 
     when job_title = 'CLERK' then 
      4 
     else 
      0 end