Issue Overview: Syntax Errors and Column Reference Problems in IIF with Subqueries The core issue revolves around the use of the IIF function in SQLite, specifically when attempting to incorporate a subquery within it. The user initially encountered a syntax error when trying to use a SELECT statement directly inside the IIF function. After resolving…
Issue Overview: RTREE Virtual Table Incorrectly Compares Large Integers as REALs The core issue arises when storing and comparing very large integer values within an SQLite RTREE virtual table. Specifically, inserting the maximum 64-bit signed integer value (9,223,372,036,854,775,807) into an RTREE column and attempting to verify its value via a comparison operator returns an unexpected…
Issue Overview: Slow SQLite3 Query Execution on iPad Gen 6 with Large BLOBs The core issue revolves around a significant performance degradation observed when executing SQLite3 queries involving large Binary Large Objects (BLOBs) on iPad Gen 6 devices. Specifically, the query in question retrieves a BLOB ranging between 1 and 20 MB from a key/value…
Character Encoding Mismatch Between SQLite and External Tools When working with SQLite databases, especially those containing non-ASCII characters such as accented letters in Spanish, it is crucial to ensure that the character encoding is consistently applied across all stages of data handling. The core issue arises when exporting data from SQLite to formats like SHP…
Issue Overview: Distinguishing Empty BLOBs from NULL in Parameter Binding The core challenge revolves around SQLite’s treatment of empty byte arrays (zero-length BLOBs) when bound as parameters via the sqlite3_bind_blob API. While SQLite inherently differentiates between NULL values and empty BLOBs at the storage layer, this distinction becomes ambiguous during parameter binding due to implementation…
Issue Overview: Misalignment Between Rootpage Number and Physical Byte Offset in SQLite Database File The core challenge revolves around accurately determining the physical byte offset of a table’s rootpage within an SQLite database file when working with low-level file operations. Developers attempting direct file manipulation for corruption testing or recovery simulations often encounter discrepancies between…
Defining Data Relevance and Archive Logic The core issue revolves around archiving a specific dataset tied to a primary key in SQLite while preserving the structure of the database tables, even if some tables contain no relevant data. The challenge lies in defining what constitutes "relevant" data and implementing a mechanism to export this data…
Understanding the Performance Gap Between Object and Array RowMode in SQLite/WASM When working with SQLite in a WebAssembly (WASM) environment, one of the critical decisions developers face is how to structure the results of their queries. The choice between rowMode: ‘object’ and rowMode: ‘array’ can have a significant impact on performance, particularly when dealing with…
Divergence in RETURNING Clause Behavior Between SQLite and PostgreSQL The RETURNING clause in SQLite and PostgreSQL allows developers to retrieve modified rows directly from INSERT, UPDATE, or DELETE statements. While SQLite historically modeled this feature after PostgreSQL, recent changes in SQLite’s implementation have introduced critical differences in how these databases handle visibility of changes during…
Reserved Keyword Conflict in Column Naming: Transaction vs TRANSACTION Issue Overview: Syntax Error on Unquoted "Transaction" Column When attempting to create a table containing a column named Transaction without quotation marks, SQLite throws a parsing error due to keyword collision. This occurs because TRANSACTION (case-insensitive) is a reserved keyword in SQLite’s parser, specifically tied to…