Missing collating sequence

SQLITE_ERROR_MISSING_COLLSEQ (257) is an extended result code returned when a prepared statement references a collating sequence that has not been registered with sqlite3_create_collation().

1. 1Using COLLATE mycollation in SQL where mycollation has not been registered.
2. 2Database file created with a custom collation that is not registered in the current session.

sqlite3_prepare() or sqlite3_step() when collation is missing.

-- SQL using unregistered collation:
SELECT * FROM t ORDER BY name COLLATE MY_COLLATION;
-- If MY_COLLATION not registered → SQLITE_ERROR_MISSING_COLLSEQ

sqlite3.OperationalError: no such collation sequence: MY_COLLATION

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