1.1 - 8.10 - Pivoting Example: NumberOfRows - Teradata Vantage

Teradata Vantage™ - Machine Learning Engine Analytic Function Reference

Product
Teradata Vantage
Release Number
1.1
8.10
Release Date
October 2019
Content Type
Programming Reference
Publication ID
B700-4003-079K
Language
English (United States)

This example specifies the NumberOfRows syntax element.

Input

The input table, pivot_input, contains temperature, pressure, and dewpoint data for three cities, in sparse format.

pivot_input
sn city week attribute value1
1 Asheville 1 temp 32
1 Asheville 1 pressure 1020.8
1 Asheville 1 dewpoint 27.6F
2 Asheville 2 temp 32
2 Asheville 2 pressure 1021.3
2 Asheville 2 dewpoint 27.4F
3 Asheville 3 temp 34
3 Asheville 3 pressure 1021.7
3 Asheville 3 dewpoint 28.2F
4 Nashville 1 temp 42
4 Nashville 1 pressure 1021
4 Nashville 1 dewpoint 29.4F
5 Nashville 2 temp 44
5 Nashville 2 pressure 1019.8
5 Nashville 2 dewpoint 29.2F
6 Brownsville 2 temp 47
6 Brownsville 2 pressure 1019
6 Brownsville 2 dewpoint 28.9F
7 Brownsville 3 temp 46
7 Brownsville 3 pressure 1019.2
7 Brownsville 3 dewpoint 28.9F

SQL Call

SELECT * FROM Pivoting (
  ON pivot_input PARTITION BY sn,city,week
  ORDER BY week,attribute
  USING
  PartitionColumns ('sn','city', 'week')
  NumberOfRows (3)
  TargetColumns ('value1')
) AS dt ORDER BY 1,2,3;

The ORDER BY clause is required. If omitted, the output table column content is nondeterministic (for more information, see Nondeterministic Results and UniqueID Syntax Element). The function adds any NULL values at the end.

Output

The function outputs the input column contents in dense format in the output columns value1_0, value1_1, and value1_2, which contain the dewpoint, pressure, and temperature, respectively. Because these values are numeric, the function casts them to VARCHAR.

 sn city        week value1_0 value1_1 value1_2 
 -- ----------- ---- -------- -------- -------- 
  1 asheville      1 27.6f    1020.8   32      
  2 asheville      2 27.4f    1021.3   32      
  3 asheville      3 28.2f    1021.7   34      
  4 nashville      1 29.4f    1021     42      
  5 nashville      2 29.2f    1019.8   44      
  6 brownsville    2 28.9f    1019     47      
  7 brownsville    3 28.9f    1019.2   46

Download a zip file of all examples and a SQL script file that creates their input tables from the attachment in the left sidebar.