Question 24 Consider students - {'Semester 1' {'Ryan':20, 'Mercy':25}, 'Semester 2': {'Justin':21, 'Andrea':26}} .What command should be used to obtain the count of entries? len(students) size(students) students.len() students.size()) Question 25 How do you obtain a list of tuples of key-value pairs in a dictionary dict? dict.get(key, default) dict.items() dict.keys) dict.valuesO

Question 24 Consider students - {'Semester 1' {'Ryan':20, 'Mercy':25}, 'Semester 2': {'Justin':21, 'Andrea':26}} .What command should be used to obtain the count of entries? len(students) size(students) students.len() students.size()) Question 25 How do you obtain a list of tuples of key-value pairs in a dictionary dict? dict.get(key, default) dict.items() dict.keys) dict.valuesO

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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CREATE DATABASE COUNTRIES; USE COUNTRIES; DROP TABLE IF EXISTS `City`; CREATE TABLE `City` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `Name` char(35) NOT NULL DEFAULT '', `CountryCode` char(3) NOT NULL DEFAULT '', `District` char(20) NOT NULL DEFAULT '', `Population` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`ID`) ) ENGINE=MyISAM AUTO_INCREMENT=4080 DEFAULT CHARSET=latin1; -- -- Dumping data for table `City` -- -- ORDER BY: `ID` INSERT INTO `City` VALUES (1,'Kabul','AFG','Kabol',1780000); INSERT INTO `City` VALUES (2,'Qandahar','AFG','Qandahar',237500); INSERT INTO `City` VALUES (3,'Herat','AFG','Herat',186800); INSERT INTO `City` VALUES (4,'Mazar-e-Sharif','AFG','Balkh',127800); INSERT INTO `City` VALUES (5,'Amsterdam','NLD','Noord-Holland',731200); INSERT INTO `City` VALUES (6,'Rotterdam','NLD','Zuid-Holland',593321); INSERT INTO `City` VALUES (7,'Haag','NLD','Zuid-Holland',440900); INSERT INTO `City` VALUES (3068,'Berlin','DEU','Berliini',3386667); INSERT INTO `City` VALUES…
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Match the description with the correct find expression: Returns index of first occurrence of str1 in str. If not found, returns str.find_first_of(str1, pos) string:npos. Returns index of first occurrence of str1 in str; the search starts at pos. If str.find(str1) not found, returns string::npos. Returns index of first occurrence in str of any character in str1, starting the str.find(str1, pos) search at pos. If not found, returns string::npos. Returns index of first occurrence in str of any character not in str1, starting str.find_first_not_of(str1, pos) the search at pos. If not found, returns string:npos. > > >
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MYSQL Create a view vTop_Course_count to list the top 2 most popular course names and the number of students took these two courses for all years. Below is a sample output. | name mycount Java2 Data Structure 10 Students sid first_name last_name birthday major zipcode Huang 1990-01-01 cs 1976-02-08 IT 1987-03-21 Math 1947-08-25 Biology 07101 1997-01-25 | CS 1995-09-15 IT 1988-01-15 |Nursing |07101 |07123 08348 1001 Austin 1002 Mary Smith 1003 Claudia Lee 91384 1004 Andrew Lin 1005 Helen Wu 07083 1007 1008 Sarah Lee 4101 Andrew |Huang Courses cid name credits CPS1231 |Java1 14 CPS2231 Java2 CPS2232 Data Structure CPS3500 Web Programming CPS3740 Database Introduction 3 CPS5740 Database Systems CPS5921 Data Mining 4 4 3 3 Students_Courses sid cid year semester grade CPS2231 2013 CPS2231 2015 CPS2231 2014 CPS3740 2011 CPS2232 2014 CPS2232 2016 1001 Fall A- 1003 Spring Spring A- 1004 1009 Fall B- 1009 Fall 1001 1004 Fall C+ CPS2232 2014 Spring B+