Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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- Answer questions 9 (a), (b) and (c) based on the following query:
SELECT EMP_LNAME, EMP_FNAME, EMP_DOB, YEAR(EMP_DOB) AS YEAR
FROM EMPLOYEE
WHERE YEAR(EMP_DOB) = 1966;
- Should you create an index on EMP_DOB? Why or why not?
Ans:
What type of
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- Topic: Database Software: SQLite Schema Table: CREATE TABLE name_basics (nconst VARCHAR(45) NOT NULL, primaryName VARCHAR(45) NULL, birthYear YEAR(4) NULL, deathYear YEAR(4) NULL, age INT NULL, movieNum INT NULL, PRIMARY KEY (nconst)); CREATE TABLE attributes (attributeID INT NOT NULL,attribute VARCHAR(45) NOT NULL,PRIMARY KEY (attributeID)); CREATE TABLE attributes_collection (akasID INT NOT NULL,attributeID INT NOT NULL,PRIMARY KEY (akasID, attributeID),CONSTRAINT attributeIDFOREIGN KEY (attributeID)REFERENCES attributes (attributeID)ON DELETE NO ACTIONON UPDATE NO ACTION);CREATE TABLE crew_directors (crewID INT NOT NULL,nconst VARCHAR(45) NOT NULL,PRIMARY KEY (crewID, nconst),CONSTRAINT crewIDFOREIGN KEY (crewID)REFERENCES title_crew (crewID)ON DELETE NO ACTIONON UPDATE NO ACTION,CONSTRAINT nconstFOREIGN KEY (nconst)REFERENCES name_basics (nconst)ON DELETE NO ACTIONON UPDATE NO ACTION);CREATE TABLE crew_writers (crewID INT NOT NULL,nconst VARCHAR(45) NOT NULL,PRIMARY KEY…arrow_forwardWhat factors influence which index method is used?arrow_forwardCreate the following tables in your database with the following schema: Table: Employee | Column Name | Type | empId I name | supervisor | salary | int | varchar | | int | int empId is the primary key column for this table. Each row of this table indicates the name and the ID of an employee in addition to their salary and the id of their manager. Table: Bonus | Column Name | Type | | empId | bonus | int | int empId is the primary key column for this table. empId is a foreign key to empId from the Employee table. Each row of this table contains the id of an employee and their respective bonus. Add the following data to your tables: Input: Employee table: | empId | name | supervisor | salary | | 3 | Brad | null | 4000 | 1000 | 2000 | 4000 | John | 3 | 2 | 4 | Dan | 3 | Thomas | 3arrow_forward
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