Functions | SQL Fundamentals | Teradata Vantage - 17.10 - Functions - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Fundamentals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1141-171K
Language
English (United States)

The following sections describe functions.

Scalar Functions

Scalar functions take input parameters and return a single value result. Some examples of standard SQL scalar functions are CHARACTER_LENGTH, POSITION, and SUBSTRING.

Aggregate Functions

Aggregate functions produce summary results. They differ from scalar functions in that they take grouped sets of relational data, make a pass over each group, and return one result for the group. Some examples of standard SQL aggregate functions are AVG, SUM, MAX, and MIN.

Built-In Functions

The built-in functions, or special register functions, which have no arguments, return various information about the system and can be used like other literals within SQL expressions. In an SQL query, the appropriate system value is substituted by the Parser after optimization but prior to executing a query using a cachable plan.

Available built-in functions include all of the following:
  • ACCOUNT
  • CURRENT_DATE
  • CURRENT_ROLE
  • CURRENT_TIME
  • CURRENT_TIMESTAMP
  • CURRENT_USER
  • DATABASE
  • DATE
  • PROFILE
  • ROLE
  • SESSION
  • TIME
  • USER

Related Information

For more information about:
  • See Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates, B035-1145 for the following.
    • Names, parameters, return values, and other details of scalar and aggregate functions
    • Clauses and phrases