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Editorial Team
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Asked: 2026-05-24T04:51:24+00:00

I’ve got a table with purchase orders stored in it. Each row has a

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I’ve got a table with purchase orders stored in it. Each row has a timestamp indicating when the order was placed. I’d like to be able to create a report indicating the number of purchases each day, month, or year. I figured I would do a simple SELECT COUNT(xxx) FROM tbl_orders GROUP BY tbl_orders.purchase_time and get the value, but it turns out I can’t GROUP BY a timestamp column.

Is there another way to accomplish this? I’d ideally like a flexible solution so I could use whatever timeframe I needed (hourly, monthly, weekly, etc.) Thanks for any suggestions you can give!

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  1. Editorial Team

    Grouping by a timestamp column works fine for me here, keeping in mind that even a 1-microsecond difference will prevent two rows from being grouped together.

    To group by larger time periods, group by an expression on the timestamp column that returns an appropriately truncated value. date_trunc can be useful here, as can to_char.

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