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EMP: NUMBER (4) EMPNO VARCHAR2 (10) ΕΝΑΜΕ VARCHAR2 (9) JOB NUMBER (4) MGR HIREDATE DATE NUMBER (7, 2) SAL NUMBER (7, 2) СOMM NUMBER (2) DE PTNΟ DEPT: NUMBER (2) DE PTNΟ VARCHAR2 (14) DNAME VARCHAR2 (13) LOC

EMP: NUMBER (4) EMPNO VARCHAR2 (10) ΕΝΑΜΕ VARCHAR2 (9) JOB NUMBER (4) MGR HIREDATE DATE NUMBER (7, 2) SAL NUMBER (7, 2) СOMM NUMBER (2) DE PTNΟ DEPT: NUMBER (2) DE PTNΟ VARCHAR2 (14) DNAME VARCHAR2 (13) LOC

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question

- Find those with manager job title but have no supervisees

- Which job has the most employees?

EMP: NUMBER (4) EMPNO VARCHAR2 (10) ΕΝΑΜΕ VARCHAR2 (9) JOB NUMBER (4) MGR HIREDATE DATE NUMBER (7, 2) SAL NUMBER (7, 2) СOMM NUMBER (2) DE PTNΟ DEPT: NUMBER (2) DE PTNΟ VARCHAR2 (14) DNAME VARCHAR2 (13) LOC
Transcribed Image Text:EMP: NUMBER (4) EMPNO VARCHAR2 (10) ΕΝΑΜΕ VARCHAR2 (9) JOB NUMBER (4) MGR HIREDATE DATE NUMBER (7, 2) SAL NUMBER (7, 2) СOMM NUMBER (2) DE PTNΟ DEPT: NUMBER (2) DE PTNΟ VARCHAR2 (14) DNAME VARCHAR2 (13) LOC
Expert Solution
Step 1

WHERE is SQL clause used to extract specific data from table.

NOT IN is used to eliminate specific part from query.

MAX is predefined function in SQL used to find maximum of extracted values.

Step 2

SQL query to find those with manager job title but have no supervisees.

SELECT * FROM WHERE JOB=’MANAGER’ NOT IN (SELECT DNAME FROM DEPT WHERE DNAME=’SUPERVICEES’);

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