SQL进阶---第二单元(第五到第八课)、Queries



第十五课、Like-l

QUERIES  Like-I

SELECT * FROM movies WHERE name LIKE 'Se_en';

LIKE can be a useful operator whenyou want to compare similar values. Here, we arecomparing two movies with the same name but are spelled differently.

1. LIKE is a special operator usedwith the WHERE clause to search for aspecific pattern in a column.

2. name LIKESe_en is a condition evaluating the name column for a specific pattern.

3. Se_en represents a pattern with a wildcard character. The _ means you can substitute any individual character here withoutbreaking the pattern. The names Seven and Se7en both match this pattern.

% is another wildcard characterthat can be used with LIKE. We will learn more about % in the next exercise.

       Instructions:

1.Let's use LIKE to query a few other patterns. In the code editor type

SELECT * FROM movies 

        WHERE name LIKE 'a%';

SELECT * FROM movies

                  WHEREname LIKE 'a%';

QueryResults

id	name	genre	year	imdb_rating
1	Avatar	action	2009	7.9
7	Avengers: Age of Ultron	action	2015	7.9
16	American Sniper	action	2014	7.4
79	Alvin and the Chipmunks: The Squeakquel	comedy	2009	4.4
82	Aladdin	comedy	1992	8.0
83	Alvin and the Chipmunks	comedy	2007	5.3
87	Austin Powers in Goldmember	comedy	2002	6.2
92	Austin Powers: The Spy Who Shagged Me	comedy	1999	6.6
117	Aliens	horror	1986	8.4
119	Annabelle	horror	2014	5.4
143	Anaconda	horror	1997	4.6
181	As Good as It Gets	romance	1997	7.8
182	American Pie 2	romance	2001	6.4
209	Air Force One	drama	1997	6.4
211	A Beautiful Mind	drama	2001	8.2

DatabaseSchema

Movies        220 rows
id	INTEGER
name	TEXT
genre	TEXT
year	INTEGER
imdb_rating	REAL

2.Remove the previous query. Thentype

SELECT * FROM movies 

        WHERE name LIKE '%man%';

What do you think % is doing?

SELECT * FROM  movies

                  WHEREname LIKE '%man%';

 

QueryResults

id	name	genre	year	imdb_rating
9	Pirates of the Caribbean: Dead Mans Chest	action	2006	7.3
10	Iron Man 3	action	2013	7.3
11	Spider-Man	action	2002	7.3
14	Spider-Man 2	action	2004	7.3
18	Spider-Man 3	action	2007	6.2
21	Iron Man	action	2008	7.9
23	Iron Man 2	action	2010	7.1
31	Man of Steel	action	2013	7.2
34	The Amazing Spider-Man	action	2012	7.1
39	Batman	action	1989	7.6
164	Pretty Woman	romance	1990	6.9
208	Rain Man	drama	1988	8.0

DatabaseSchema

Movies            220 rows
id	INTEGER
name	TEXT
genre	TEXT
year	INTEGER
imdb_rating	REAL

 

 

第十六课、Like-II

QUERIES  Like-II

SELECT * FROM movies 

        WHERE name LIKE 'A%';

This statement filters the result set to only include movieswith names that begin with the letter "A"

% is a wildcard character thatmatches zero or more missing letters in the pattern.

• A% matches all movies with names that begin with "A"

• %a matches all movies that end with "a"

SELECT * FROM movies 

        WHERE name LIKE '%man%';

Youcan use % both before and after apattern. Here, any movie that contains the word "man" in itsname will be returned in the result set. Notice, that LIKE is not case sensitive. "Batman" and "Man Of Steel" both appear inthe result set.

 

instructions

1.BETWEEN is another special operator that can be used in a WHERE clause. In the code editor, type

SELECT * FROM movies WHERE name BETWEEN 'A' AND 'J';

QueryResults

id	name	genre	year	imdb_rating
211	A Beautiful Mind	drama	2001	8.2
209	Air Force One	drama	1997	6.4
82	Aladdin	comedy	1992	8.0
117	Aliens	horror	1986	8.4
83	Alvin and the Chipmunks	comedy	2007	5.3
79	Alvin and the Chipmunks: The Squeakquel	comedy	2009	4.4
182	American Pie 2	romance	2001	6.4
16	American Sniper	action	2014	7.4
143	Anaconda	horror	1997	4.6
119	Annabelle	horror	2014	5.4
181	As Good as It Gets	romance	1997	7.8
87	Austin Powers in Goldmember	comedy	2002	6.2
92	Austin Powers: The Spy Who Shagged Me	comedy	1999	6.6
1	Avatar	action	2009	7.9
7	Avengers: Age of Ultron	action	2015	7.9
88	Back to the Future	comedy	1985	8.5
39	Batman	action	1989	7.6
153	Beauty and the Beast	romance	1991	8.0
46	Beverly Hills Cop	action	1984	7.3
218	Big Daddy	drama	1999	6.4
78	Big Hero 6	comedy	2014	7.9
138	Blade	horror	1998	7.1
124	Blade II	horror	2002	6.7
75	Brave	comedy	2012	7.2
170	Bridesmaids	romance	2011	6.8
72	Bruce Almighty	comedy	2003	6.7
36	Captain America: The Winter Soldier	action	2014	7.8
71	Cars	comedy	2006	7.2
197	Cast Away	drama	2000	7.7
217	Catch Me If You Can	drama	2002	8.0
90	Charlie and the Chocolate Factory	comedy	2005	6.7
156	Cinderella	romance	2015	7.1
190	Click	romance	2006	6.4
127	Cloverfield	horror	2008	7.1
131	Constantine	horror	2005	6.9
203	Dances with Wolves	drama	1990	8.0
128	Dark Shadows	horror	2012	6.2
200	Dawn of the Planet of the Apes	drama	2014	7.7
68	Despicable Me	comedy	2010	7.7
55	Despicable Me 2	comedy	2013	7.5
122	Dracula	horror	1992	7.5
168	Elf	romance	2003	6.9
139	End of Days	horror	1999	5.7
45	Fast & Furious 6	action	2013	7.2
171	Fifty Shades of Grey	romance	2015	4.2
54	Finding Nemo	comedy	2003	8.2
148	Forrest Gump	romance	1994	8.8
123	Freddy vs. Jason	horror	2003	5.8
145	Friday the 13th	horror	2009	5.6
53	Frozen	comedy	2013	7.6
17	Furious Seven	action	2015	7.4
155	Ghost	romance	1990	7.0
76	Ghostbusters	comedy	1984	7.8
202	Gladiator	drama	2000	8.5
214	Gone Girl	drama	2014	8.2
157	Gone with the Wind	romance	1939	8.2
100	Gremlins	horror	1984	7.2
19	Guardians of the Galaxy	action	2014	8.1
216	Hannibal	drama	2001	6.7
95	Happy Feet	comedy	2006	6.5
192	Harry Potter and the Deathly Hallows: Part 2	drama	2011	8.1
165	Hitch	romance	2005	6.7
61	Home Alone	comedy	1990	7.4
66	How the Grinch Stole Christmas	comedy	2000	6.0
195	I Am Legend	drama	2007	7.2
133	I Know What You Did Last Summer	horror	1997	5.6
96	Ice Age: Dawn of the Dinosaurs	comedy	2009	7.0
97	Ice Age: The Meltdown	comedy	2006	6.9
30	Inception	action	2010	8.8
27	Independence Day	action	1996	6.9
22	Indiana Jones and the Kingdom of the Crystal Skull	action	2008	6.2
56	Inside Out	comedy	2015	8.6
121	Insidious: Chapter 2	horror	2013	6.6
201	Interstellar	drama	2014	8.7
106	Interview with the Vampire: The Vampire Chronicles	horror	1994	7.6
21	Iron Man	action	2008	7.9
23	Iron Man 2	action	2010	7.1
10	Iron Man 3	action	2013	7.3

DatabaseSchema

Movies          220 rows
id	INTEGER
name	TEXT
genre	TEXT
year	INTEGER
imdb_rating	REAL

 

2.Remove theprevious query. Then type

SELECT * FROM movies

        WHERE year BETWEEN 1990 AND 2000;

 

SELECT * FROM movies

                  WHEREyear BETWEEN 1990 AND 2000;

QueryResults

id	name	genre	year	imdb_rating
5	Star Wars: Episode I - The Phantom Menace	action	1999	6.6
27	Independence Day	action	1996	6.9
42	Twister	action	1996	6.3
49	The Lost World: Jurassic Park	action	1997	6.5
61	Home Alone	comedy	1990	7.4
66	How the Grinch Stole Christmas	comedy	2000	6.0
69	Men in Black	comedy	1997	7.2
70	Toy Story 2	comedy	1999	7.9
80	Mrs. Doubtfire	comedy	1993	6.9
82	Aladdin	comedy	1992	8.0
92	Austin Powers: The Spy Who Shagged Me	comedy	1999	6.6
99	What Lies Beneath	horror	2000	6.6
101	The Blair Witch Project	horror	1999	6.4
106	Interview with the Vampire: The Vampire Chronicles	horror	1994	7.6
108	Scream	horror	1996	7.2
110	Scream 2	horror	1997	6.1
111	Sleepy Hollow	horror	1999	7.4
113	The Haunting	horror	1999	4.9
114	Scream 3	horror	2000	5.5
122	Dracula	horror	1992	7.5
133	I Know What You Did Last Summer	horror	1997	5.6
138	Blade	horror	1998	7.1
139	End of Days	horror	1999	5.7
143	Anaconda	horror	1997	4.6
144	Wolf	horror	1994	6.2
147	Titanic	romance	1997	7.7
148	Forrest Gump	romance	1994	8.8
153	Beauty and the Beast	romance	1991	8.0
155	Ghost	romance	1990	7.0
162	What Women Want	romance	2000	6.4
164	Pretty Woman	romance	1990	6.9
167	Theres Something About Mary	romance	1998	7.1
169	Tarzan	romance	1999	7.2
172	Robin Hood: Prince of Thieves	romance	1991	6.9
175	Jerry Maguire	romance	1996	7.3
177	Runaway Bride	romance	1999	5.4
181	As Good as It Gets	romance	1997	7.8
187	Pocahontas	romance	1995	6.6
191	The Lion King	drama	1994	8.5
193	The Sixth Sense	drama	1999	8.2
197	Cast Away	drama	2000	7.7
199	Saving Private Ryan	drama	1998	8.6
202	Gladiator	drama	2000	8.5
203	Dances with Wolves	drama	1990	8.0
204	The Perfect Storm	drama	2000	6.4
209	Air Force One	drama	1997	6.4
218	Big Daddy	drama	1999	6.4
219	Se7en	drama	1995	8.6

DatabaseSchema

movies220 rows
id	INTEGER
name	TEXT
genre	TEXT
year	INTEGER
imdb_rating	REAL

 

 

第十七课、Between

QUERIES   Between

The BETWEEN operator is used to filterthe result set within a certain range. The values can be numbers, text ordates.

SELECT * FROM movies 

        WHERE name BETWEEN 'A' AND 'J';

This statement filters the result set to only include movieswith names that begin with letters"A" up to but not including "J".

SELECT * FROM movies 

        WHERE year BETWEEN 1990 AND 2000;

In this statement, the BETWEENoperator is being used to filter the result set to only includemovies with years between 1990 up to andincluding 2000.

 

Instructions:

1.Instead of returning every moviemade BETWEEN 1990 and 2000, let's just returnthe movies that are comedies. In the code editor, type

SELECT * FROM movies 

        WHERE year BETWEEN 1990 AND 2000 

                 AND genre = 'comedy';

 

SELECT * FROM movies

                  WHEREyear BETWEEN 1990 AND 2000

                                            ANDgenre = 'comedy';

QueryResults

id	name	genre	year	imdb_rating
61	Home Alone	comedy	1990	7.4
66	How the Grinch Stole Christmas	comedy	2000	6.0
69	Men in Black	comedy	1997	7.2
70	Toy Story 2	comedy	1999	7.9
80	Mrs. Doubtfire	comedy	1993	6.9
82	Aladdin	comedy	1992	8.0
92	Austin Powers: The Spy Who Shagged Me	comedy	1999	6.6

DatabaseSchema

Movies          220 rows
id	INTEGER
name	TEXT
genre	TEXT
year	INTEGER
imdb_rating	REAL

 

 

第十八课、And

QUERIES And

SELECT * FROM movies 

        WHERE year BETWEEN 1990 and 2000 

                 AND genre = 'comedy';

Sometimes you want to combine multiple conditions in a WHEREclause to make the result setmore specific and useful. One way of doing this is to use the AND operator.

1. year BETWEEN1990 and 2000 is the first condition in the WHEREclause.

2. AND genre ='comedy' is the second condition in the WHEREclause.

3. AND is an operator that combinestwo conditions. Both conditions must be true for the row to be included in theresult set. Here, we use the ANDoperator to only return moviesmade between 1990 and 2000 that are also comedies.

 

         Instructions:

1. Similar to AND, the ORoperator can be used withthe WHERE clause, but there are someimportant differences. In the code editor, type

   SELECT * FROM movies

                     WHEREyear < 1980

                                 OR genre = 'comedy';

   SELECT * FROM movies

           WHERE genre = 'comedy'

                    OR year < 1980;

   QueryResults

id	name	genre	year	imdb_rating
6	Star Wars	action	1977	8.7
51	Shrek 2	comedy	2004	7.2
52	Toy Story 3	comedy	2010	8.4
53	Frozen	comedy	2013	7.6
54	Finding Nemo	comedy	2003	8.2
55	Despicable Me 2	comedy	2013	7.5
56	Inside Out	comedy	2015	8.6
57	Shrek the Third	comedy	2007	6.0
58	Minions	comedy	2015	6.7
59	Up	comedy	2009	8.3
60	Monsters, Inc.	comedy	2001	8.1
61	Home Alone	comedy	1990	7.4
62	Meet the Fockers	comedy	2004	6.3
63	The Hangover	comedy	2009	7.8
64	Monsters University	comedy	2013	7.4
65	Shrek	comedy	2001	7.9
66	How the Grinch Stole Christmas	comedy	2000	6.0
67	The Hangover Part II	comedy	2011	6.5
68	Despicable Me	comedy	2010	7.7
69	Men in Black	comedy	1997	7.2
70	Toy Story 2	comedy	1999	7.9
71	Cars	comedy	2006	7.2
72	Bruce Almighty	comedy	2003	6.7
73	My Big Fat Greek Wedding	comedy	2002	6.6
74	Shrek Forever After	comedy	2010	6.4
75	Brave	comedy	2012	7.2
76	Ghostbusters	comedy	1984	7.8
77	Rush Hour 2	comedy	2001	6.6
78	Big Hero 6	comedy	2014	7.9
79	Alvin and the Chipmunks: The Squeakquel	comedy	2009	4.4
80	Mrs. Doubtfire	comedy	1993	6.9
81	Ted	comedy	2012	7.0
82	Aladdin	comedy	1992	8.0
83	Alvin and the Chipmunks	comedy	2007	5.3
84	Madagascar 3: Europes Most Wanted	comedy	2012	7.0
85	Kung Fu Panda	comedy	2008	7.6
86	The Lorax	comedy	2012	6.5
87	Austin Powers in Goldmember	comedy	2002	6.2
88	Back to the Future	comedy	1985	8.5
89	Wedding Crashers	comedy	2005	7.0
90	Charlie and the Chocolate Factory	comedy	2005	6.7
91	Ratatouille	comedy	2007	8.0
92	Austin Powers: The Spy Who Shagged Me	comedy	1999	6.6
93	Tangled	comedy	2010	7.8
94	Monsters vs. Aliens	comedy	2009	6.6
95	Happy Feet	comedy	2006	6.5
96	Ice Age: Dawn of the Dinosaurs	comedy	2009	7.0
97	Ice Age: The Meltdown	comedy	2006	6.9
109	Jaws 2	horror	1978	5.7
116	The Amityville Horror	horror	1979	6.2
157	Gone with the Wind	romance	1939	8.2
161	Snow White and the Seven Dwarfs	romance	1937	7.7
174	The Sound of Music	romance	1965	8.0
194	Jaws	drama	1975	8.1
220	Seven	drama	1979	6.1

DatabaseSchema

Movies       220 rows
id	INTEGER
name	TEXT
genre	TEXT
year	INTEGER
imdb_rating	REAL