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:
为进一步提升河东村供水稳定性和安全保障水平，我县已将河东村等3村饮水安全改造提升项目纳入2026年建设计划，该项目计划于今年3月开工、6月底竣工通水，完成供水管网与满坪水库主干管网的对接，实现水源优化升级。
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