在sqlite3 python中,如何从子键检索父键中的特定数据字段?
在sqlite3 python中,如何从子键检索父键中的特定数据字段在sqlite3 python中,如何从子键检索父键中的特定数据字段?,python,sqlite,Python,Sqlite,在sqlite3 python中,如何从子键检索父键中的特定数据字段 CREATE TABLE artist( artistid INTEGER PRIMARY KEY, artistname TEXT ); CREATE TABLE track( trackid INTEGER PRIMARY KEY, trackname TEXT, artistid INTEGER FOREIGN KEY(artistid) REFERENCES artist(artistid)
CREATE TABLE artist(
artistid INTEGER PRIMARY KEY,
artistname TEXT
);
CREATE TABLE track(
trackid INTEGER PRIMARY KEY,
trackname TEXT,
artistid INTEGER
FOREIGN KEY(artistid) REFERENCES artist(artistid)
);
track.execute('''SELECT artisid, trackname FROM track WHERE artistid = 1''')
假设现在我已经执行了track表,得到了artisid和trackname,我也想检索artisname并将其放在两者之间,我该怎么做呢 如果您已经拥有艺术家ID,只需执行一个简单的
选择:
SELECT artistname FROM artist WHERE artistid = ?
如果要在同一查询中检索名称,必须联接两个表:
SELECT artist.artistid,
artist.artistname,
track.trackname
FROM track JOIN artist ON track.artistid = artist.artistid
WHERE artist.artistid = ?