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Series
As developers, we use databases all the time. But how do they work? In this series, we'll try to answer that question by building our own SQLite-compatible database from scratch. Source code examples will be provided in Rust, but you are encouraged t...
In the previous post, we discovered the SQLite file format and implemented a toy version of the .tables command, allowing us to display the list of tables in a database. But our implementation has a jarring limitation: it assumes that all the data fi...
After discovering the SQLite file format and implementing the .tables command in part 1 and part 2 of this series, we're ready to tackle the next big challenge: writing our own SQL parser from scratch. As the SQL dialect supported by SQLite is quite ...
As we saw in the opening post, SQLite stores metadata about tables in a special "schema table" starting on page 1. We've been reading records from this table to list the tables in the current database, but before we can start evaluating SQL queries a...
In the previous posts, we've explored the SQLite file format and built a simple SQL parser. It's time to put these pieces together and implement a query evaluator! In this post, we'll lay the groundwork for evaluating SQL queries and build a query ev...
Up to this point, we've been using simple test databases where the data for each row fits within a single page. However, in the wild, it is quite common for a row to be larger than a single page (typically 4096 bytes), especially when using variable-...
