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Is there a way to reset an entire column to zero using Oracle SQL Express 11g

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Hello all, This is my first posting on the forums. Here is my question: I want to reset an entire column to zero monthly. Is the possible using Oracle SQL Express 11g? I looked for a way to do it in the Oracle SQL Developer, but I didn't find away to easily do it there. This is for a school project. One of the columns in the table is called monthly sales. That is the column that I want to reset to zero on the 1st of the month. Thanks in advance if anyone can answer this for me.

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Is there away to do this automatically when a new month begins? I was told a trigger could do it, but this trigger would run every time there is an update to the cell. I don't think that is a very good way to accomplish this as it could cause a lot of overhead.

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