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To generate a date column using a PostgreSQL query with a date interval, you can use the generate_series() function to generate a series of dates within the desired date range.
For example, if you wanted to generate a date column for the month of March 2021, you could use the following query:
SELECT generate_series('2021-03-01'::date, '2021-03-31'::date, '1 day')::date AS date_column;
This query will generate a series of dates starting from March 1st, 2021 and ending on March 31st, 2021 with an interval of 1 day. The "::date" syntax is used to cast the output of generate_series() as a date data type.
You can adjust the start and end dates and the interval to generate a date column for any desired date range.