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| | RDBMS (Site not responding. Last check: 2007-11-07) |
 | | SQL (the standard RDBMS language) is used to define the lists, the relations and to insert a retrieve values. |
 | | Firstly, it is probably worth distinguishing between a relational database, which is responsible for storing data as relations (sets of tuples, roughly), and a Relational DataBase Management System (RDBMS) which is responsible for managing access to such a database (e.g., takes care of concurrency issues, security, etc). |
 | | The underlying relational model (see Ratcl for an extension that provides access to relational operators) is quite closely related to first-order predicate logic (FOPL), as a (mathematical) relation can be identified with a predicate (boolean valued function) which determines set membership of elements in the relation. |
| wiki.tcl.tk /2098 (558 words) |
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