How use qualify row_number in teradata?

@dedrick 

To use the ROW_NUMBER() function in Teradata, you can follow these steps:

1. First, you need to specify the columns you want to partition by in the OVER clause. These columns will determine the rows within which the row number will be calculated.
2. Then, you can use the ROW_NUMBER() function along with the ORDER BY clause to assign a unique row number to each row within the specified partition.

Here is an example query using the ROW_NUMBER() function in Teradata:

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SELECT 
  column1,
  column2,
  ROW_NUMBER() OVER(PARTITION BY column1 ORDER BY column2) AS row_num
FROM 
  your_table;

In this query, the ROW_NUMBER() function is used to assign row numbers within each partition defined by the values in column1. The rows are ordered based on the values in column2. Each row within the partition will have a unique row number starting from 1.

You can use the row_num column in your further analysis or filtering based on the row number assigned to each row.