U

UNION Clause:

An SQL clause used to merge the results of two queries into a single set of records.

Unique Key:

Like a primary key a unique key is created on a field containing only unique values for a specific field, or composite of fields, for all records throughout an entire table.

Until Loop:

A special type of loop that will test for continuation of loop processing at the end of the loop, executing the loop at least once.

UPDATE:

An SQL command used to change values in table fields in a relational database.

URI:

Universal Resource Indicator (can be on a LAN, WAN, or the Internet).

URL:

Universal Resource Locator (address on the Internet).

User :

See End User .

User Defined:

Something defined by a user or developer, usually a developer, for making the coding process easier.

User-Defined Data Type:

See Custom Data Type .

User Friendly:

Describes a software application, or otherwise that allows ease of use for the computer illiterate (the end user population). The more user-friendly software is, the easier it is for anyone to use.