PostgreSQL – How to Get the First Day of Month From a Date

ByAdmin

To get the first day of the month from a date in PostgreSQL, you can use the DATE_TRUNC function. Here’s an example:

SELECT DATE_TRUNC('month', your_date_column) AS first_day_of_month FROM your_table;

where your_date_column is the name of your date column and your_table is the name of your table.

This query will return the first day of the month for each date in the specified column. The DATE_TRUNC function truncates the date to the beginning of the specified period, which in this case is ‘month’.

For example, if you have a table called sales with a date column named transaction_date, you can retrieve the first day of the month for each transaction like this:

SELECT transaction_date, DATE(DATE_TRUNC('month', transaction_date)) AS first_day_of_month FROM sales;

This will give you a result set with the first day of the month for each transaction date in the sales table.

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