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Introduction This document describes the architecture of the SQLite library. The information here is useful to those who want to understand or modify the inner workings of SQLite. A nearby diagram shows the main components of SQLite and how they ... 
SQLite Query Language: upsert
(lang_UPSERT.html)
 ... UPSERT in SQLite follows the syntax established by PostgreSQL. UPSERT syntax was added to SQLite with version 3.24.0 (2018-06-04). An UPSERT is an ordinary INSERT statement that is followed by the special ON CONFLICT clause shown ... 
An Asynchronous I/O Module For SQLite NOTE: WAL mode with PRAGMA synchronous set to NORMAL avoids calls to fsync() during transaction commit and only invokes fsync() during a checkpoint operation. The use of WAL mode largely obviates the need ... 
1. Introduction  ... It is very rare that an application developer will need to edit the SQLite source code in order to incorporate SQLite into a product. We call custom modifications to the SQLite source code that are held for the use of ... 
Why SQLite Does Not Use Git
(whynotgit.html)
1. Introduction  ... SQLite uses Fossil instead, which is a version control system that was specifically designed and written to support SQLite. People often wonder why SQLite does not use the Git version control system like everybody else. This article attempts to answer ... 
1. Summary The following two objects and eight methods comprise the essential elements of the SQLite interface: sqlite3 → The database connection object. Created by sqlite3_open() and destroyed by sqlite3_close(). sqlite3_stmt → The prepared statement object. Created by sqlite3_prepare() and destroyed by ... 
Overview An SQLite database is highly resistant to corruption. If an application crash, or an operating-system crash, or even a power failure occurs in the middle of a transaction, the partially written transaction should be automatically rolled back the next ... 
Datatypes In SQLite Version 2 1.0   Typelessness SQLite is "typeless". This means that you can store any kind of data you want in any column of any table, regardless of the declared datatype of that column. (See the ... 
NULL Handling in SQLite Versus Other Database Engines The goal is to make SQLite handle NULLs in a standards-compliant way. But the descriptions in the SQL standards on how to handle NULLs seem ambiguous. It is not clear from ... 
SQLite Foreign Key Support
(foreignkeys.html)
Overview This document describes the support for SQL foreign key constraints introduced in SQLite version 3.6.19 (2009-10-14). The first section introduces the concept of an SQL foreign key by example and defines the terminology used for the ... 

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