FIRST Function | Teradata Vantage - 17.10 - FIRST - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Time Series Tables and Operations

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1208-171K
Language
English (United States)

Returns the oldest value, determined by the timecode, for each group. FIRST is a single-threaded function.

To invoke the FIRST function, use the GROUP BY TIME clause.

Return Values

The return value is the same data type as the input data type.

Nulls are not included in the result computation.

Usage Notes

FIRST is only valid on numeric data.

In the event of a tie, such as simultaneous timecode values for a particular group, all tied results are returned. If a sequence number is present with the data, it can break a tie, assuming it is unique across identical timecode values.