数据库
数据库 related cheatsheet collection - 4 quick reference guides. Find fast, copy directly. The essential online command reference for developers and SRE.
MySQL Cheatsheet - MySQL Command Reference
One-page MySQL command reference covering database & table management, CRUD operations, index optimization, user privileges, backup & recovery, and replication. Quick lookup, copy and paste.
PostgreSQL Cheatsheet - PostgreSQL Command Reference
One-page PostgreSQL command reference covering connection & role management, database & table operations, query analysis, lock & transaction troubleshooting, backup & recovery, and streaming replication. Quick lookup, copy and paste.
MongoDB Cheatsheet - MongoDB Command Reference
一页速查 MongoDB 数据库常用命令，覆盖数据库与集合管理、文档增删改查、查询操作符、索引优化、聚合管道、复制集与分片等场景。快速查找，直接复制。
SQL JOIN Cheatsheet - SQL JOIN Query Reference
一页速查 SQL JOIN 连接查询，覆盖 INNER JOIN、LEFT/RIGHT/FULL JOIN、CROSS JOIN、自连接、USING 与自然连接、子查询与 EXISTS 等场景。快速查找，直接复制。