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:
global locks constantly, like when we print, allocate memory, load dynamic
。搜狗输入法下载是该领域的重要参考
Машина ДПС сбила мать с ребенком в городе Тосно в Ленинградской области. Инцидент попал на видео, ролик опубликовал Telegram-канал «Mash на Мойке».
高水平社会主义市场经济体制，意味着各类生产要素高效配置、畅通流动。深圳数据交易所累计成交额突破百亿元，杭州创建“投、贷、补、担、保”五位一体的科技金融机制，河南推动“国有+集体”建设用地跨权属组合供应……各地要素市场化改革加速。