CREATE TABLE test (id INTEGER PRIMARY KEY, name TEXT, value REAL);the column id becomes an alias for the internal rowid — the B-tree key itself. A query like WHERE id = 5 resolves to a direct B-tree search and scales O(log n). (I already wrote a TLDR piece about how B-trees work here.) The SQLite query planner documentation states: “the time required to look up the desired row is proportional to logN rather than being proportional to N as in a full table scan.” This is not an optimization. It is a fundamental design decision in SQLite’s query optimizer:
on the tool may lead to a lack of understanding of the data
，详情可参考PDF资料
Dr. Becky’s ‘magic potion’
Default trait method implementations
，详情可参考safew官方下载
USB 2.X/USB 3.X/USB 4: Every USB device is built to some version of the USB specification, mainly characterized by how much data they can transfer and how much power they can deliver (or at least, those are the main things you need to care about). While most of these devices are inter-operable as long as they use the same port, the entire chain will conform to the slowest part of the chain. Say you plug a USB 3.2 SSD into a USB 3.2 port on your computer, but use a USB 3.0 cable—data will only transfer at USB 3.0 speeds. Make sure every link in your chain is rated for the speed you need.
XAP：旧时代 Silverlight 应用，本质就是 ZIP 改后缀，无法与桌面/平板通用；。关于这个话题，下载安装汽水音乐提供了深入分析