1つのクエリで部門ごとにTOP指定従業員を選択

Question

部門ごとに指定された従業員を探すにはどうすればいいですか？

私はこのテーブルと値を持っている：ここで

CREATE TABLE [dbo].[#deptartment] 
(
    [emp_id] [INT] IDENTITY(1, 1) NOT NULL, 
    [dept_name] [VARCHAR](100) NULL, 
    [emp_name] [VARCHAR](50) NULL , 
    [desig] [VARCHAR](100) NULL 
) 
ON [PRIMARY] 
GO 

INSERT INTO #deptartment VALUES ('IT','JAFFERY','DIRECTOR') 
INSERT INTO #deptartment VALUES ('DEVELOPMENT','CORBIT','PROGRAMMER') 
INSERT INTO #deptartment VALUES ('DEVELOPMENT','CHANDRA','DBA') 
INSERT INTO #deptartment VALUES ('IT','KEVIN','MANAGER') 
INSERT INTO #deptartment VALUES ('IT','ROBERT','SUPERVISOR') 
INSERT INTO #deptartment VALUES ('QA','NOMAN','ANALYST') 
INSERT INTO #deptartment VALUES ('ADMIN','CORE','RECEPTIONIST') 
INSERT INTO #deptartment VALUES ('QA','MADDEN','ANALYST') 
INSERT INTO #deptartment VALUES ('IT','NORRIS','TECHNICIAN') 
INSERT INTO #deptartment VALUES ('ADMIN','PATRICK','CLERK') 
INSERT INTO #deptartment VALUES ('DATA','SONJA','SUPERVISOR') 
INSERT INTO #deptartment VALUES ('QA','GEORGE','MANAGER') 
INSERT INTO #deptartment VALUES ('ADMIN','EMILLY','MANAGER') 
INSERT INTO #deptartment VALUES ('QA','PATRICK','TESTER') 
INSERT INTO #deptartment VALUES ('DEVELOPMENT','ABDUL','MANAGER') 
INSERT INTO #deptartment VALUES ('DATA','PATRICK','CLERK') 
INSERT INTO #deptartment VALUES ('ADMIN','GEORGE','CLERK') 
INSERT INTO #deptartment VALUES ('DEVELOPMENT','YURIY','SUPERVISOR') 
INSERT INTO #deptartment VALUES ('DATA','GRAHAM','OPERATOR') 

は、私が試したクエリです：

SELECT D1.dept_name, D1.desig, 
    RANK() OVER(Partition BY D1.DESIG ORDER BY D1.dept_name,D1.DESIG 
    DESC) 
    AS RANKNUMBER 
    FROM #deptartment D1 GROUP BY D1.desig, D1.dept_name 
    ORDER BY RANKNUMBER DESC 

Answer 1

あなたは条件付き順位/オーダーを探しています。 order by caseステートメントに注意してください。あなたはのあなたの定義に従って、desigの注文を行うためにこのステートメントを完了する必要があります。です。私は最初の3のためのいくつかの仮定をしたが、ちょうどあなたのポストにCAPSを削除してくださいdesig

select 
    x.emp_id 
    ,x.dept_name 
    ,x.emp_name 
from(
    select 
     d.emp_id 
     ,d.dept_name 
     ,d.emp_name 
     ,row_number() over (partition by d.dept_name order by case 
                   when d.desig = 'DIRECTOR' then 1 
                   when d.desig = 'SUPERVISOR' then 2 
                   when d.desig = 'OPERATOR' then 3 
                   --etc... 
                   end) as RN 
    from #deptartment d) x 
where x.RN = 1