Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Create a Student table with the following column names, data types, and constraints:
ID - integer with range 0 to 65 thousand, auto increment, primary key
FirstName - variable-length string with max 20 chars, not NULL
LastName - variable-length string with max 30 chars, not NULL
Street - variable-length string with max 50 chars, not NULL
City - variable-length string with max 20 chars, not NULL
State - fixed-length string of 2 chars, not NULL, default "TX"
Zip - integer with range 0 to 16 million, not NULL
Phone - fixed-length string of 10 chars, not NULL
Email - variable-length string with max 30 chars, must be unique
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- The following code will #define N_ROW 10 #define N_COL 10 int row; double sum=0, table[N_ROW][N_COL]; sum = 0; for (row = 0; row < N_ROW; row++) sum += table[row][1] sum the values of the column with an index of 1. sum the values of the row with an index of 1. sum the values of the row with an index of N_ROW. none of the others sum the values of the first column in the array.arrow_forwardQuestion 6 To get all the variables named x1 through x15 (out of 30 variables that start with x) from data, you could use O filter(data starts with("x")) select(flights."x") Oselect(data.num_range("x"1:15) Opick(flights.starts with("x")) Question 7 To reverse sort the nycflights13::flights data set by month and then by day, you would use O sort values(flights.day.month.descending-TRUE) O filter(flights.desc(month).desc(day)) O filter(flights.desc(day).desc(month)) Osort values(flights,month.day.ascending FALSE) Question 8 To get all the variables from the flights like "arr_delay" and "dep_delay", you could use O filter(flights,ends_with("_delay")) O select(flights.""_delay") O select(flights,ends_with("_delay")) Opick(flights,ends_with("_delay"))arrow_forwardcomplete the docstring using the information provided:arrow_forward
- The Horse table has the following columns: ID - integer, auto increment, primary key RegisteredName - variable-length string Breed - variable-length string, must be one of the following: Egyptian Arab, Holsteiner, Quarter Horse, Paint, Saddlebred Height - decimal number, must be between 10.0 and 20.0 BirthDate - date, must be on or after Jan 1, 2015 Insert the following data into the Horse table: RegisteredName Breed Height BirthDate Babe Quarter Horse 15.3 2015-02-10 Independence Holsteiner 16.0 2017-03-13 Ellie Saddlebred 15.0 2016-12-22 NULL Egyptian Arab 14.9 2019-10-12arrow_forwardThe Horse table has the following columns: ID - integer, primary key RegisteredName - variable-length string Breed - variable-length string Height - decimal number BirthDate - date Write a SELECT statement to select the registered name, height, and birth date for only horses that have a height between 15.0 and 16.0 (inclusive) or have a birth date on or after January 1, 2020. -- Your SELECT statement goes hereSELECT *FROM HorseWHERE (Height >= '15.0' AND Height <= '16.0') OR BirthDate >= '2020-01-01';arrow_forwardHow do you index a CLOB datatype for faster search operations?arrow_forward
- 12. List the isbn and name of the book, the id and firstname of the editors. Make sure to include all books in the book table. Order alphabetically by book name.arrow_forwardnycflights13::flights Q4<- flights %>%filter(carrier == "JFK") %>%summarise(average_dist = mean(distance)%>%summarise(max_dist = max(average_dist))%>%group_by(Q4, month, day)%>%head(Q4[order(dat$month),(dat$day),(dat$max_dist)],n=5) *not pictured, I did upload, tidy verse, dplyr, and the nycflights13 libraries. Error: Incomplete expression: Q4<- flights %>% filter(carrier == "JFK") %>% summarise(average_dist = mean(distance)%>% summarise(max_dist = max(average_dist))%>% group_by(Q4, month, day)%>% head(Q4[order(dat$month),(dat$day),(dat$max_dist)],n=5) RStudio Question: I can't figure out what is wrong with my code. Could someone take a look at it? See below for what I am trying to do, my code and my error output. I am trying to find what 5 days of the year had the highest mean distance from JFK airport, using the nycflights13 library. I want to format it in month, day, andvmean distance.arrow_forwardGuided Table Build: We will be Creating a Table called Student For the 6 following questions, your submission will be the query that shows you’ve created the table conforming to the requirements. Create a Table Named Student. The first column should be named ID, and have a data type of Integer The second column should be named First_Name, and have a data type of varchar(255). The third column should be named Last_Name, and have a data type of varchar(255) The fourth column should be named DOB (short for date of birth), and have a data type of date. The firth column should be named Adv_ID (short for advisor ID), and have a data type of integer.arrow_forward
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