有关SQL RDMS连接的优化/扩展用例

I'm creating a platform that will allows users to save pages on an AWS S3 bucket. The page will have as much static information listed as is possible, but I still need the page to issue a query (AJAX) that will touch my server. This query can get all the information it needs from a single table with one exception, a full name. To do this, I need the query to join a second table.I'm creating a platform that will allows users