Issue Overview: Column Affinity in Compound Views Leading to Inconsistent Query Results In SQLite, column affinity plays a critical role in determining how data is stored, compared, and retrieved. Column affinity refers to the recommended type of data that a column can hold, such as INTEGER, TEXT, REAL, or BLOB. While SQLite is flexible with…
Issue Overview: Mismatched Integer-Float Comparisons in RTREE Queries When working with SQLite’s RTREE virtual tables and large integer values, developers may encounter unexpected query results due to implicit type conversions between integers and floating-point numbers. This issue arises when comparing a 64-bit integer rowid stored in an RTREE_i32 table against a floating-point value derived from…
Issue Overview: Subquery Aliasing in FROM Clause vs. WITH Clause The core issue revolves around the recognition of table aliases in SQLite when using subqueries in the FROM clause versus the WITH clause. Specifically, the problem arises when a subquery is aliased within the FROM clause, and the alias is not recognized in subsequent parts…
Issue Overview: Inserting Rows with Modified Primary Keys on Conflict When working with SQLite, a common scenario arises where you need to insert multiple rows into a table, but some of these rows may conflict with existing primary keys. The standard INSERT ON CONFLICT clause in SQLite allows you to either ignore the conflict, replace…
Schema-Changing Commands and Their Implicit Transaction Requirements SQLite’s transactional guarantees extend to schema modifications such as ALTER TABLE, CREATE INDEX, and certain PRAGMA statements. These operations are not exempt from ACID (Atomicity, Consistency, Isolation, Durability) principles but exhibit unique locking behaviors that differ from standard data manipulation language (DML) operations like INSERT or UPDATE. The…
Issue Overview: Inefficient Query Execution Despite Indexes on Time and UTC Columns The core issue revolves around unexpected performance degradation in SQLite when executing two types of queries: SELECT COUNT(*) FROM pkts taking ~30 seconds on a 1.15 million-row table Range queries with WHERE utc BETWEEN clauses exhibiting multi-minute execution times Though indexes exist on…
Conflict Resolution Ambiguity Leading to Index Corruption Issue Overview The core problem arises when executing a REPLACE INTO statement containing redundant ON CONFLICT clauses targeting the same unique constraint column. This redundancy creates ambiguity in SQLite’s conflict resolution logic, leading to index corruption. The corruption manifests as discrepancies between the data stored in tables and…
Issue Overview: Missing strftime(‘%V’) Output in SQLite 3.45.x The core problem revolves around the absence of expected output when using strftime(‘%V’,’now’) in SQLite versions prior to 3.46.0. This format specifier aims to return ISO 8601 week numbers (01-53) for date/time values but produces no result in SQLite 3.45.1 and earlier releases. The behavior occurs because…
Issue Overview: Incorrect NULL Results in Window Functions and Aggregations The core issue revolves around SQLite’s handling of NULL values in the context of window functions and aggregations, particularly when combined with the NOT NULL constraint optimization. The problem manifests when a query involving a window function or aggregation returns unexpected results due to the…
Understanding the Differences Between Upsert and Insert or Replace The core issue revolves around the choice between using INSERT OR REPLACE and INSERT … ON CONFLICT DO UPDATE in SQLite, particularly when dealing with tables defined with the WITHOUT ROWID clause. Both approaches are used to handle situations where a record might already exist, but…