IS 324/325

Notes for

Wednesday

October 30, 2013

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Class Notes

Exam #1: grading not complete… will e-mail your grade to you on Friday or over the weekend

Homework: graded on Friday or over the weekend… grades will be e-mailed to you

Reading assignment for Nov 4 has been changed

No class on Wednesday, Nov 6

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Let’s Get Our “SQL Feet” Wet

Let’s play in the sandbox:

http://edu.konagora.com/SQLsandbox.php#

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Homework 1 Question 1

List the names and ages (in years) of all the actors who have not died.

SELECT first_name, surname, 2013 - born as ageFROM peopleWHERE died IS NULL ;

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Homework 1 Question 2

List the names and the release year of all the movies that were released in 1956.

SELECT title, year_released FROM moviesWHERE year_released = 1956 ;

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Homework 1 Question 3

List  the names and the country code of all the French movies (the 2-letter identified for France is fr).

SELECT title, countryFROM moviesWHERE country = "fr" ;

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Homework 1 Question 4

List the names, the release year, and the country code for all the American or British movies released between 1940 and 1949 (the 2-letter identified for the United States is us and Great Britain is gb).

SELECT title, year_released , countryFROM moviesWHERE year_released BETWEEN 1940 AND 1949 AND (country = "us" OR country = "gb" );

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Homework 1 Question 5

List the names of all the movies that begin with the capital letter T.

SELECT titleFROM moviesWHERE title LIKE "T%" ;

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Practice Query (1a)

Can you replace the "OR" clause below?

SELECT title, year_released , countryFROM moviesWHERE year_released BETWEEN 1940 AND 1949 AND (country = "us" OR country = "gb" );

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Practice Query (1b)

Can you replace the "OR" claue below?

SELECT title, year_released , countryFROM moviesWHERE year_released BETWEEN 1940 AND 1949 AND country IN ("us" , "gb" ) ;

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Practice Query (2a)

List all the movies that do not begin with a capital T

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Practice Query (2b)

List all the movies that do not begin with a capital T

SELECT titleFROM moviesWHERE title NOT LIKE "T%" ;

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Practice Query (3a)

List all the movie titles and their release years in this format:

XXXXXXXXX was released in YYYY.

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Practice Query (3b)

List all the movie titles and their release years in this format:

XXXXXXXXX was released in YYYY.

SELECT title || " was released in " || year_released || "."FROM movies ;

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Practice Query (3c)

List all the movie titles and their release years in this format:

XXXXXXXXX was released in YYYY.

SELECT title || " was released in " || year_released || "." AS Output_Sentence_DemoFROM movies ;

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Practice Query (4a)

List all the movie titles and their county in this format for French and British movies:

XXXXXXXXX is a French movie.YYYYYYYYY is a British movie.

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Practice Query (4b)

List all the movie titles and their county in this format for French and British movies:

XXXXXXXXX is a French movie.YYYYYYYYY is a British movie.

SELECT title || " is a " || CASE country WHEN "fr" THEN "French" WHEN "gb" THEN "British" END || " movie."FROM movies ;

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Practice Query (4c)

SELECT title || " is a " || CASE country WHEN "fr" THEN "French" WHEN "gb" THEN "British" ELSE "country of unknown origin " END || "movie."FROM movies ;

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Practice Query (5a)

How do we remove the duplicates?

SELECT countryFROM movies ;

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Practice Query (5b)

How do we remove the duplicates?

SELECT DISTINCT countryFROM movies ;

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Practice Query (6a)

How do we capitalize the first letter of every word in the title?

SELECT titleFROM movies ;

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Practice Query (6b)

How do we capitalize the first letter of every word in the title?

SELECT initcap (title)FROM movies ;

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Practice Query (7a)

Who died most recently?

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Practice Query (7b)

Who died most recently?

SELECT first_name || " " || surname, diedFROM people WHERE died = ( SELECT max(died) FROM people) ;

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Practice Query (8a)

How many movies are there?

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Practice Query (8b)

How many movies are there?

SELECT COUNT (*)FROM movies ;

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Practice Query (9a)

How many movies are there by country?

SELECT COUNT (*)FROM movies ;

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Practice Query (9b)

How many movies are there by country?

SELECT COUNT (*), countryFROM moviesGROUP BY country ORDER BY 1 ;

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Practice Query (9c)

How many movies are there by country? Can I put them in order by "number of movies"?

SELECT COUNT (*), countryFROM moviesGROUP BY 1 ;

SELECT COUNT (*) AS Num_Movies, countryFROM moviesGROUP BY Num_Movies ;

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Practice Query (9c)

How many movies are there by country? Can I put them in order by "number of movies"?

SELECT COUNT (*), countryFROM moviesGROUP BY country ORDER BY 1 ;

SELECT COUNT (*) AS Num_Movies, countryFROM moviesGROUP BY country ORDER BY Num_Movies DESC ;

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Practice Query (10a)

What is the title of the oldest movie from each country?

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Practice Query (10b)

What is the title of the oldest movie from each country?

SELECT country, title, MIN(year_released)FROM moviesGROUP BY country ;

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Big Data...Almost the Opposite of Relational Model

What is it and why is it important?

http://www.youtube.com/watch?v=7D1CQ_LOizA

http://www.youtube.com/watch?v=R-bypPCIE9g