mysql练习----More JOIN operations

Posted 2020-09-13 Stay Hungry, Stay Foolish

This tutorial introduces the notion of a join. The database consists of three tables movie , actor and casting .

 

movie	actor	casting
id	id	movieid
title	name	actorid
yr		ord
director
budget
gross

 

 

movie

Field name	Type	Notes
id	INTEGER	An arbitrary unique identifier
title	CHAR(70)	The name of the film - usually in the language of the first release.
yr	DECIMAL(4)	Year of first release.
director	INT	A reference to the actor table.
budget	INTEGER	How much the movie cost to make (in a variety of currencies unfortunately).
gross	INTEGER	How much the movie made at the box office.

Example

id	title	yr	director	budget	gross
10003	"Crocodile" Dundee II	1988	38	15800000	239606210
10004	\'Til There Was You	1997	49	10000000

actor

Field name	Type	Notes
id	INTEGER	An arbitrary unique identifier
name	CHAR(36)	The name of the actor (the term actor is used to refer to both male and female thesps.)

Example

id	name
20	Paul Hogan
50	Jeanne Tripplehorn

casting

Field name	Type	Notes
movieid	INTEGER	A reference to the movie table.
actorid	INTEGER	A reference to the actor table.
ord	INTEGER	The ordinal position of the actor in the cast list. The star of the movie will have ord value 1 the co-star will have value 2, ...

Example

movieid	actorid	ord
10003	20	4
10004	50	1

 

 

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