issues: 644161221
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| 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 | {"url": "https://api.github.com/repos/simonw/sqlite-utils/issues/117/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} |