issues: 644161221

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app reactions draft state_reason
644161221 MDU6SXNzdWU2NDQxNjEyMjE= 117 Support for compound (composite) foreign keys 9599 open 0     3 2020-06-23T21:33:42Z 2020-06-23T21:40:31Z   OWNER  

It turns out SQLite supports composite foreign keys: https://www.sqlite.org/foreignkeys.html#fk_composite

Their example looks like this: ```sql CREATE TABLE album( albumartist TEXT, albumname TEXT, albumcover BINARY, PRIMARY KEY(albumartist, albumname) );

CREATE TABLE song( songid INTEGER, songartist TEXT, songalbum TEXT, songname TEXT, FOREIGN KEY(songartist, songalbum) REFERENCES album(albumartist, albumname) ); ```

Here's what that looks like in sqlite-utils:

``` In [1]: import sqlite_utils

In [2]: import sqlite3

In [3]: conn = sqlite3.connect(":memory:")

In [4]: conn
Out[4]: <sqlite3.Connection at 0x1087186c0>

In [5]: conn.executescript(""" ...: CREATE TABLE album( ...: albumartist TEXT, ...: albumname TEXT, ...: albumcover BINARY, ...: PRIMARY KEY(albumartist, albumname) ...: ); ...:
...: CREATE TABLE song( ...: songid INTEGER, ...: songartist TEXT, ...: songalbum TEXT, ...: songname TEXT, ...: FOREIGN KEY(songartist, songalbum) REFERENCES album(albumartist, albumname) ...: ); ...: """)
Out[5]: <sqlite3.Cursor at 0x1088def10>

In [6]: db = sqlite_utils.Database(conn)

In [7]: db.tables
Out[7]: [<Table album (albumartist, albumname, albumcover)>, <Table song (songid, songartist, songalbum, songname)>] In [8]: db.tables[0].foreign_keys Out[8]: [] In [9]: db.tables[1].foreign_keys Out[9]: [ForeignKey(table='song', column='songartist', other_table='album', other_column='albumartist'), ForeignKey(table='song', column='songalbum', other_table='album', other_column='albumname')] ``` The table appears to have two separate foreign keys, when actually it has a single compound composite foreign key.

140912432 issue     
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