SQLITE_ERROR_MISSING_COLLSEQERRORTier 2 — Caution⚠️ MEDIUM confidenceMissing collating sequence
🔴 Production Risk Error
Medium — queries will fail until the collation is registered.
What this means
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().
Why it happens
- 1Using COLLATE mycollation in SQL where mycollation has not been registered.
- 2Database file created with a custom collation that is not registered in the current session.
How to reproduce
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_COLLSEQFix 1
Why this works
Register the collation before preparing the statement: sqlite3_create_collation(db, "MY_COLLATION", ...)
Fix 2
Why this works
In Python with apsw: conn.createcollation("MY_COLLATION", my_collation_func)
Version notes
Sources
📚 Official docs: https://www.sqlite.org/rescode.html#error_missing_collseq
🔧 Source ref: sqlite3.h — SQLITE_ERROR_MISSING_COLLSEQ = 257
📖 Further reading: sqlite3_create_collation()
Confidence assessment
⚠️ MEDIUM confidence
Stable.
See also
📄 Reference pages