Incorrect Query Output with Indexed WHERE Clause and Aggregate Subquery The core issue involves a SQLite query returning an unexpected value (1) instead of the logically anticipated result (0) when combining an indexed outer query with a specific type of aggregate subquery. This occurs under precise conditions related to query planner optimizations introduced in SQLite…
Issue Overview: Assertion Failures and Data Corruption in LSM1 During Large Blob Insertions The core issue revolves around assertion failures and data corruption in the LSM1 database engine when inserting large blobs (512 KB and 1 MB) into the database, particularly when the database size exceeds 2.0 GB. The problem manifests in two distinct scenarios:…
Issue Overview: Integrating SQLite WASM with JavaScript for Executable SQL Examples The integration of SQLite WASM with JavaScript to create executable SQL examples in web components presents a unique set of challenges and opportunities. This approach allows developers to embed interactive SQL queries directly into articles, blogs, or documentation, enabling readers to execute and visualize…
Issue Overview: SHA3-256 Hash Discrepancy Between SQLite and OpenSSL When working with cryptographic hash functions, consistency across different implementations is crucial. A common issue arises when the SHA3-256 hash generated by SQLite differs from the one produced by OpenSSL. This discrepancy can lead to confusion, especially when the same input is expected to yield identical…
Transaction Lifecycle Conflicts After Savepoint Rollbacks The core issue revolves around SQLite’s handling of transaction states following the use of ROLLBACK TO on a savepoint. When a savepoint is rolled back, SQLite does not automatically terminate the transaction or reset the autocommit state. This behavior can lead to unintended consequences, such as prolonged database locks…
Unexpected Query Failures with Hyphenated Terms and OR Operators in FTS5 Core Observations The user encountered inconsistent behavior when querying an FTS5 virtual table with hyphenated terms and logical operators. Specific issues include: soft-cover failing with a "no such column: cover" error. "soft-cover" succeeding despite the hyphen. "well-ness" failing to match the indexed term "wellness."…
Composite Primary Key Constraint Failure Despite Perceived Unique Values Understanding the Composite Key Constraint Error The error SQLITE_CONSTRAINT_PRIMARYKEY occurs when an INSERT or UPDATE operation violates a primary key’s uniqueness requirement. For a composite primary key (e.g., (ID_FSTkurz, ID_Bef) in TBL2), the combination of values across all key columns must be unique. The error indicates…
Issue Overview: Silent Failure in .open –deserialize and .backup –async with Pipes The core issue revolves around the SQLite CLI’s inability to handle deserialization and asynchronous backup operations when the input is provided via a pipe. Specifically, the .open –deserialize and .backup –async commands fail silently when attempting to read from a pipe, such as…
Understanding the Problem: Variable Replacement in SQLite The core issue revolves around replacing multiple placeholders in a text field (source_text) of the extention_files_detal table with corresponding values from the variable_list table. The placeholders are stored in the variable_name column of the variable_list table, and their corresponding replacement values are stored in the variable_text column. The…
Understanding Query Plan Divergence in Recursive CTEs with DISTINCT vs. GROUP BY The core issue revolves around a recursive Common Table Expression (CTE) in SQLite where replacing SELECT DISTINCT with an equivalent GROUP BY clause drastically altered the query execution plan, improving performance. The original query used SELECT DISTINCT dst AS root FROM mandatory, which…