Write an algorithm to perform a range query(with rectangular shape,Q) in a quadtree.(Please write comments to explain the meaning of your pseudo-code).

The table R(x,y) currently has the following tuples (note there are duplicates): (1,2), (1,2), (2,3), (3,4), (3,4), (4,1), (4,1), (4,1), (4,2). Compute the result of the query: SELECT R1.x, R2.y, COUNT(*) FROM R R1, R R2 WHERE R1.y = R2.x GROUP BY R1.x, R2.y; Which of the following tuples is in the result? O a. (3, 4, 6) O b. (3, 2, 6) O c. (3, 2, 2) O d. (4, 3, 2)

There is no language attribute in the table So Not able to run any query. this is what I have in the table .hopefully that will help to solve this part. DROP TABLE IF EXISTS `CountryLanguage`; CREATE TABLE `CountryLanguage` ( `CountryCode` char(3) NOT NULL DEFAULT '', `Language` char(30) NOT NULL DEFAULT '', `IsOfficial` enum('T','F') NOT NULL DEFAULT 'F', `Percentage` float(4,1) NOT NULL DEFAULT '0.0', PRIMARY KEY (`CountryCode`,`Language`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1; -- -- Dumping data for table `CountryLanguage` -- -- ORDER BY: `CountryCode`,`Language` INSERT INTO `CountryLanguage` VALUES ('AFG','Balochi','F',0.9); INSERT INTO `CountryLanguage` VALUES ('AFG','Dari','T',32.1); INSERT INTO `CountryLanguage` VALUES ('AFG','Pashto','T',52.4); INSERT INTO `CountryLanguage` VALUES ('AFG','Turkmenian','F',1.9); INSERT INTO `CountryLanguage` VALUES ('AFG','Uzbek','F',8.8); INSERT INTO `CountryLanguage` VALUES ('DEU','German','T',91.3); INSERT INTO `CountryLanguage` VALUES…

You have the table T = (name, ssn, phone number) representing a person. Each name is uniquely identified by ssn, but the same name can have multiple phone numbers. Suppose you break the tables into two tables T1=(name, ssn) and T2= (name, phone number) a) What are the candidate keys of T, T1, and T2, respectively?