A question asked about data contained in two or more tables in a relational database. The relational query must specify the tables required and what the condition is that links them; for example ...

A method for describing a database query originally developed by IBM for mainframes. A replica of an empty record is displayed and the search conditions are typed in under their respective columns ...

Graph database query languages are growing, ... All databases need a way to talk with their clients, and the query languages they speak define what the database can do.