README.md

INNER JOIN操作

• 交集的觀念

INNER JOIN範例

• 使用chinook.db

範例1

SELECT  TrackId,name,Title
FROM tracks
INNER JOIN albums ON albums.AlbumId = tracks.AlbumId
ORDER By TrackId

範例2

SELECT
    trackid,
    name,
    tracks.albumid AS album_id_tracks,
    albums.albumid AS album_id_albums,
    title
FROM
    tracks
    INNER JOIN albums ON albums.albumid = tracks.albumid;

範例3

SELECT
    trackid,
    tracks.name AS track,
    albums.title AS album,
    artists.name AS artist
FROM
    tracks
    INNER JOIN albums ON albums.albumid = tracks.albumid
    INNER JOIN artists ON artists.artistid = albums.artistid;