sql
sql related cheatsheet collection - 5 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.
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。
Knex.js Cheatsheet - Knex SQL Query Builder Reference
一页速查 Knex.js SQL 查询构建器常用命令，覆盖查询数据、插入更新删除、Join 关联、聚合分组、事务管理、Schema 构建、原始查询与调试等场景。快速查找，直接复制。
SQLite Cheatsheet - SQLite Database Command Reference
One-page SQLite database reference covering database creation, table operations, CRUD, indexes and constraints, transactions, import/export, and sqlite3 CLI. Find fast, copy directly.