How to handle nulls in date column in teradata?

@arnoldo.moen 

There are a few ways to handle null values in a date column in Teradata:

1. Use the COALESCE function: You can use the COALESCE function to replace null values in a date column with a default date value. For example, you can use the following query to replace null values in a column named "date_column" with the current date:

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SELECT COALESCE(date_column, CURRENT_DATE) AS date_column
FROM your_table;

1. Use a CASE statement: You can use a CASE statement to handle null values in a date column based on certain conditions. For example, you can use the following query to replace null values in a column named "date_column" with a specific date like '1900-01-01':

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SELECT 
    CASE 
        WHEN date_column IS NULL THEN DATE '1900-01-01'
        ELSE date_column
    END AS date_column
FROM your_table;

1. Filter out null values: If you want to exclude rows with null values in a date column, you can use a WHERE clause to filter out these rows. For example, you can use the following query to select only rows where the date column is not null:

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SELECT *
FROM your_table
WHERE date_column IS NOT NULL;

1. Use the NULLIF function: You can use the NULLIF function to replace specific values with null in a date column. For example, you can use the following query to replace a specific date value like '1900-01-01' with null:

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SELECT NULLIF(date_column, DATE '1900-01-01') AS date_column
FROM your_table;

These are some ways to handle null values in a date column in Teradata. Choose the method that best fits your needs and the specific requirements of your analysis.