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

Time Series Tables and Operations

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Published
July 2021
Language
English (United States)
Last Update
2021-07-28
dita:mapPath
zzg1600277315070.ditamap
dita:ditavalPath
zzg1600277315070.ditaval
dita:id
B035-1208
lifecycle
previous
Product Category
Teradata Vantageā„¢

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.