Search results
Results from the WOW.Com Content Network
In relational databases a virtual column is a table column whose value(s) is automatically computed using other columns values, or another deterministic expression. Virtual columns are defined of SQL:2003 as Generated Column, [1] and are only implemented by some DBMSs, like MariaDB, SQL Server, Oracle, PostgreSQL, SQLite and Firebird (database server) (COMPUTED BY syntax).
SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
LAS VEGAS (AP) — Milwaukee coach Doc Rivers has heard and seen enough. He's convinced there will be an NBA team in Las Vegas. “Yeah, they're going to get it,” Rivers said.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
The Atlanta Falcons are expected to release Kirk Cousins before the March 17 due date for the currently demoted quarterback's $10 million roster bonus, ESPN reported Saturday.
Winter coats are smart. In parts of the U.S. with brutal winters, like New England and the Upper Midwest, dog owners should invest in a coat for their dog, veterinarians say.
DAL—Database Abstraction Layer; DAO—Data Access Object; DAO—Data Access Objects; DAO—Disk-At-Once; DAP—Directory Access Protocol; DARPA—Defense Advanced Research Projects Agency; DAS—Direct Attached Storage; DAT—Digital Audio Tape; DB—Database; DSKT—Desktop; DBA—Database Administrator; DBCS—Double Byte Character Set