FIRST Function | Teradata Vantage - 17.00 - FIRST - Teradata Database

Teradata Vantageā„¢ - Time Series Tables and Operations

prodname
Advanced SQL Engine
Teradata Database
vrm_release
17.00
created_date
June 2020
category
Programming Reference
featnum
B035-1208-170K

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.