-   所以是 PostgreSQLDatabase Management System ★ 18.8K Database License: PostgreSQLPostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. 
-   所以是 MariaDBCommunity-developed open SQL server ★ 6.5K Database License: GPL-2.0MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.