Database Concepts (8th Edition)
Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
bartleby

Concept explainers

Question
Book Icon
Chapter 3, Problem 3.13RQ
Program Plan Intro

SQL:

  • SQL stands for “Structured Query Language”.
  • The current version of SQL is “ANSI SQL – 92”.
  • It contains constructs which are used to define and process database. They are executed using DBMS-supplied command prompt.
  • SQL is not a programming language. It is text-based and it is also called as data sublanguage. In order to get SQL as a complete programming language, it should be included in scripting languages like Java, C#, and so on.

DROP TABLE statement:

“DROP TABLE” statement comes under Data Definition Language. It is used to delete the information and to delete the structure of the table. The syntax to drop a table is as follows.

Syntax:

DROP TABLE table_Name;

ALTER TABLE Statement:

“ALTER TABLE” statement comes under Data Definition Language. It is used to modify column, add constraints, add column(s), drop column, rename column name and table name, drop constraints, and so on.

Syntax:

Syntax to drop constraint is as follows:

ALTER TABLE table_Name DROP CONSTRAINT constraintName;

Blurred answer
Students have asked these similar questions
Just wanted to know, if you had a scene graph, how do you get multiple components from a specific scene node within a scene graph? Like if I wanted to get a component from wheel from the scene graph, does that require traversing still?   Like if a physics component requires a transform component and these two component are part of the same scene node. How does the physics component knows how to get the scene object's transform it is attached to, this being in a scene graph?
How to develop a C program that receives the message sent by the provided program and displays the name and email included in the message on the screen?Here is the code of the program that sends the message for reference: typedef struct {    long tipo;    struct {        char nome[50];        char email[40];    } dados;} MsgStruct; int main() {    int msg_id, status;    msg_id = msgget(1000, 0600 | IPC_CREAT);    exit_on_error(msg_id, "Creation/Connection");    MsgStruct msg;    msg.tipo = 5;    strcpy(msg.dados.nome, "Pedro Silva");    strcpy(msg.dados.email, "pedro@sapo.pt");    status = msgsnd(msg_id, &msg, sizeof(msg.dados), 0);    exit_on_error(status, "Send");    printf("Message sent!\n");}
9. Let L₁=L(ab*aa), L₂=L(a*bba*). Find a regular expression for (L₁ UL2)*L2. 10. Show that the language is not regular. L= {a":n≥1} 11. Show a derivation tree for the string aabbbb with the grammar S→ABλ, A→aB, B→Sb. Give a verbal description of the language generated by this grammar.

Chapter 3 Solutions

Database Concepts (8th Edition)

Knowledge Booster
Background pattern image
Computer Science
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
  • Text book image
    A Guide to SQL
    Computer Science
    ISBN:9781111527273
    Author:Philip J. Pratt
    Publisher:Course Technology Ptr
    Text book image
    Oracle 12c: SQL
    Computer Science
    ISBN:9781305251038
    Author:Joan Casteel
    Publisher:Cengage Learning
Text book image
A Guide to SQL
Computer Science
ISBN:9781111527273
Author:Philip J. Pratt
Publisher:Course Technology Ptr
Text book image
Oracle 12c: SQL
Computer Science
ISBN:9781305251038
Author:Joan Casteel
Publisher:Cengage Learning