INFO20003 Week 7 Lab Objectives: • Practice further joins involving three and four tables • Understand CASE statements and the UNION clause • Develop complex SQL queries using derived tables and views • Create and understand relational divides using EXISTS and NOT EXISTS Section 1: More SQL More about joins Consider a query to list […]
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INFO20003 Week 3 Lab ER Modelling with MySQL Workbench Objectives: In this lab you will: • Learn about MySQL data types • Choose proper data types for physical ER models • Create a physical data model with the MySQL Workbench modelling tool Section 1: Modelling participation constraints In last week’s lab you developed a simple
D 8 9 1. (a) (b) (c) (d) (e) 2. (a) COMS W4111.001–Introduction to Databases Fall 2020 Homework Assignment 2 Solutions ΠD (T2 )= T1 IT1.C=T2.A T2 = T1 I T2 = T1 − T2 = (T1 IT2)I(T2 IT2)= ρ(T1(1 → starName1,2 → title1,3 → year1),Stars) ρ(T2(1 → starName2,2 → title2,3 → year2),Stars) Πtitle1,year1,title2,year2(T1 I(title1̸=title2∨year1̸=year2)∧starName1=starName2
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INFO20003 Database Systems Dr Renata Borovica-Gajic Lecture 14 Query Optimization Part II Week 7 1 INFO20003 Database Systems © University of Melbourne Remember this? Components of a DBMS DBMS Query processing module Parser/ Compiler Optimizer Executor TODAY Plan enumeration Concurrency control module Transaction mgr. Lock mgr. Crash recovery module Concurrency control module Log mgr. Storage
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COMS W4111.001 — Introduction to Databases Fall 2020 Homework Assignment 1 Due Date: Friday October 9, 5 p.m. ET Submission: on Gradescope 1. (3 pts.) Let us design a database for a university. This database will include information about departments, professors, and courses (and their offerings): ● Information about professors includes their SSN and name.
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Differential Equations: Fall 2020 Online Projects 4.3 Numerical Methods for Systems 259 PART TWO Inordertohelpincreaseyourunderstandingofthetechniques and concepts taught in this course, and gain some knowledge how to write and implement a computer program, you are being assigned three projects. 1. Additionally,writeout1-2page(s)responsepaper onthe following: The projects come in two parts; I have outlined the parts and
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Homework 3 Weijie Cai 1. R(A,B,C)withFD:C->AandA->B a. C -> A, A -> B, C -> B (By transitivity in Armstrong¡¯s axioms) b. {C} 2. S(A,B,C,D)withFD:AB->C,BC->D,CD->A,AD->B a. AB->C,BC->D,CD->A,AD->B b. If order doesn¡¯t matter: {A,B,C}, {A,B,D}, {B,C,D} If order matters: {ABC}, {ABD}, {BCA}, {BCD}, {CDB}, {DAB} 3. R(A,B,C,D,E)withFD:DE->C,B->D,ABE->C a. DE->C,B->D,ABE->C b. R_1 = R(A,B,D,E) R_2 = R(A,B,C,E)
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COMS W4111.001–Introduction to Databases Fall 2020 Homework Assignment 2 Due Date: Friday October 23 at 5 p.m. ET (We will be posting homework solutions on Wednesday October 28 after 5 p.m. ET) Submission: On Gradescope 1. (1.5 pts.) Consider relation T1, with attributes A, B, and C: and relation T2, with attributes A, B, and
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CS W4111.001 Introduction to Databases Fall 2020 Computer Science Department Columbia University 1 Object-Relational Databases, or ORDBMSs 2 Inheritance • To reuse and refine type definitions • To create hierarchies of collections with similar but not identical objects SQL standard doesn’t support multiple inheritance, so each subtype has only one immediate supertype 32 Type Inheritance
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1. COMS W4111.001 — Introduction to Databases Fall 2020 Homework Assignment 1 Solutions 2. CREATE TABLE Drivers ( LicenseNumber Name DateOfBirth PRIMARY KEY CREATE TABLE InsurancePolicies ( PolicyNumber Cost CHAR(32), CHAR(40), DATE, (LicenseNumber)) INTEGER, REAL, REAL, (PolicyNumber)) INTEGER, CHAR(32), DATE, REAL, CHAR(50), (LicenseNumber) REFERENCES Drivers CREATE TABLE Tickets ( CREATE TABLE Cars ( CREATE
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