Questions about retrieving only a part of the database

I have a table with the attributes fid, content, and time. Fid is the id of a friend, and content is what a friend says. each friend can say many sentences and many friends. now, if there are many friends and each friend says a lot, how can I retrieve any amount of data by time. Now I can only foreach the fid and retrieve only part of it in the pu database.
I have a table with the attributes fid, content, and time. Fid is the id of a friend, and content is what a friend says. each friend can say many sentences and many friends. now, if there are many friends and each friend says a lot, how can I retrieve any amount of data by time. Now I can only foreach the fid and then push it to a new array, then sort it by time, and then retrieve some of the mid-range values, but this is too inefficient. Is there any other way?

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Are all data retrieved, or a specified number of data retrieved?
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Select fid, content, time from table order by time desc
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Sort by time

Order by time
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We recommend that you paste your table results and your code so that others can know what you want.
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Let's take a look at the issue of key code.