A database that maintains a set of separate, related files (tables), but combines data elements from the files for queries and reports when required. The concept was developed in 1970 by Edgar Codd, ...

Moving data from one source to another is not all that difficult in the scheme of things. If your source data is a tab-delimited file, for example, and you need it in an SQL relational database, you ...

Software that turns SQL commands written within a source program into the appropriate function calls for the database management system (DBMS) being used. After the SQL precompiler stage, the ...