Make sure that all joined fields are of identical types, otherwise the
query executor must cast each and every join value, which may be
affecting the query time...
Can you even define fields having foreign keys to be of a different type?
Anyway, taking a look at my JOIN
INNER JOIN users ON users.id = collections.user_id
INNER JOIN game_pieces ON game_pieces.id = collections.game_piece_id
INNER JOIN games_sets ON games_sets.id = game_pieces.games_set_id
INNER JOIN games ON games.id = games_sets.game_id
users.id is VARCHAR(20) and is a FK to collections.user_id which is
VARCHAR(20)
game_pieces.id is BIGINT(20) and is a FK to collections.game_piece_id which
is BIGINT(20)
games_sets.id is BIGINT(20) and is a FK to game_pieces.games_set_id which is
BIGINT(20)
games.id is BIGINT(20) and is a FK to games_sets.game_id which is BIGINT(20)
thnx,
Christoph
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