Suppose you have a relation containing the x. y coordinates and names of restaurants. Suppose also that the only queries that will be asked are of the following form: The query specifies a point, and asks if there is a restaurant exactly at that point. Which type of index would be preferable, R-tree or B-tree? Why?

Suppose you have a relation containing the x. y coordinates and names of restaurants. Suppose also that the only queries that will be asked are of the following form: The query specifies a point, and asks if there is a restaurant exactly at that point. Which type of index would be preferable, R-tree or B-tree? Why?

Programming with Microsoft Visual Basic 2017

8th Edition

ISBN:9781337102124

Author:Diane Zak

Publisher:Diane Zak

Chapter12: Database Queries With Sql

Section: Chapter Questions

Problem 1MQ2

See similar textbooks

Similar questions

Consider the following SQL Query: SELECT FNAME, DNAME FROM EMP AS E, DEPT AS D WHERE E.DNO = D.DNUMBER AND D.DNAME='CCI' AND SALARY > 15000; Draw the initial query tree for the above SQL query, and then show how the query tree is optimized by applying the Heuristic Rules. (You need to show the tree after applying a rule).
Suppose you have a relation containing the x, y coordinates and names ofrestaurants. Suppose also that the only queries that will be asked are of the following form: The query specifies a point and asks if there is a restaurant exactly at that point. Which type of index would be preferable, R-tree or B-tree? Why?
PLZ help with the following: IN SQL Let R (A, B, C) be a relation schema. What happens if we execute the following query? SELECT* FROM R WHERE A=D; Select one: a. We get an error. b. The query executes successfully but returns no tuples. c. The query returns all the tuples in R.
had dout in datastructures: Create the given table and implement the queries: OrderNo PurchaseAmt OrderDate Customer_ID Salesman_Id 1001 150.5 1-01-2021 111 211 1002 250.75 2-01-2021 112 212 1003 500.00 2-01-2021 113 213 1004 100.00 3-01-2021 113 214 1005 57.34 4-01-2021 114 214 Find the total PurchaseAmt for all the orders Find the average PurchaseAmt for all the orders Find the total count of orders done. Find the minimum PurchaseAmt for Customer_ID 113 Find the maximum PurchaseAmt for Salesman_ID 214 Display all the details in descending order of PurchaseAmt. Update the Customer_ID as 115 whose PurchaseAmt is 150.5
Suppose relations R(A,B) and S(B,C,D) have the tuples shown below: R A B 5 3 4 46 8 479 Compute the result of the join query: SELECT A, R.B, S.B, C, D FROM R, S WHERE R.A
Draw the initial query tree for this query, then show how the query tree is optimized (one rule at a time) and write the SQL query for the final optimized query tree.
Specify the initial canonical query tree that corresponds to each query. 1) SELECT AVG(CUSTOMER.AGR) AS "AVG_AGE" FROM CUSTOMER; 2) SELECT * FROM VEHICLE WHERE V_BRAND LIKE 'L%'; 3) SELECT MEDIAN(VEHICLE.YEAR_OF_MADE) AS "MEDIAN_YEAR" FROM VEHICLE ;
I have created the DDL below: I am getting an error about an existing constraint with the borrower_fkey for the borrower relation. At the same time, I feel like I have not satisfied all the requirements. Could someone show me what I did wrong? The class is being taught using PostgreSQL so the changes have to be applicable to postgreSQL. Thank you! CREATE TABLE branch (branch_name varchar(25) NOT NULL,branch_city varchar(15),assets numeric(15,2),CONSTRAINT branch_pkey PRIMARY KEY (branch_name));CREATE TABLE customer (ID varchar(10),customer_name varchar(25) NOT NULL,customer_street varchar(25) NOT NULL,customer_city varchar(15) NOT NULL,CONSTRAINT customer_pkey PRIMARY KEY (ID));CREATE TABLE loan (loan_number varchar(25) NOT NULL,branch_name varchar(25) NOT NULL,amount numeric(25,2) NOT NULL,CONSTRAINT loan_pkey PRIMARY KEY (loan_number),CONSTRAINT loan_fkey FOREIGN KEY (branch_name) REFERENCES branch (branch_name) ON DELETE CASCADE); CREATE TABLE borrower (ID varchar(25),loan_number…
Repeat Exercise 4, but this time use the EXISTS operator in your query.
Write relation algebra for following:Student( Enrno, name, courseId, emailId, cellno)Course(courseId, course_nm, duration)i) Add a column city in student table.ii) Find out list of students who have enrolled in “computer” course.iii) List name of all courses with their duration.iv) List name of all students start with “a”.v) List email Id and cell no of all mechanical engineering students.
Write relation algebra queries for following:Student( Enrno, name, courseId, emailId, cellno)Course(courseId, course_nm, duration)i) Add a column city in student table.ii) Find out list of students who have enrolled in “computer” course.iii) List name of all courses with their duration.iv) List name of all students start with “a”.v) List email Id and cell no of all mechanical engineering students.
Given the tables create table T (A int primary key, B int); create table U (C int primary key, A int, foreign key(A) references T(A) ); Table T contains 100 rows and table U contains 200 rows. A common mistake made by students is to do a join and assuming the database will supply the join predicate. A student does the query SELECT T.A, T.B, U.C FROM T, U; The student does not get an error message but gets a large result set. How many rows are in the result set?