user-defined types - definição. O que é user-defined types. Significado, conceito
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O que (quem) é user-defined types - definição

FUNCTION PROVIDED BY THE USER OF A PROGRAM OR ENVIRONMENT
User defined function; User Defined Function; DEF FN

Structured type         
COMPOSITE USER-DEFINED DATA TYPE IN SQL
Structured user-defined type
The SQL:1999 standard introduced a number of object–relational database features into SQL, chiefly among them structured user-defined types, usually called just structured types. These can be defined either in plain SQL with CREATE TYPE but also in Java via SQL/JRT.
User-defined function         
A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. UDFs are usually written for the requirement of its creator.
user name         
PERSON WHO USES A COMPUTER OR NETWORK SERVICE
Screen name (computing); User name; Username; Computer user; Account (computing); UserName; User Name; User-name; User-Name; Normal user; Screenname; User name policy; Internet pseudonym; User area; Computer logon; Computer users; My account; Screenames; Aol screen names; AOL screen names; Usernames; User Account; User Accounts; User accounts; User preferences; Changing Username; User names; Switching usernames; Switching user names; User account; User (system); Software users; Changing username; Login name; In-game name; Account name; Warmware
<operating system, security> (Or "logon") A unique name for each user of computer services which can be accessed by several persons. Users need to identify themselves for accounting, security, logging, and resource management. Usually a person must also enter a password in order to access a service. Once the user has logged on the operating system will often use a (short) user identifier, e.g. an integer, to refer to them rather than their user name. User names can usually be any short string of alphanumeric characters. Common choices are first name, initials, or some combination of first name, last name, initials and an arbitrary number. User names are often assigned by {system administrators} according to some local policy, or they may be chosen by the users themselves. User names are often also used as mailbox names in electronic mail addresses. (1997-03-16)

Wikipédia

User-defined function

A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. UDFs are usually written for the requirement of its creator.