inner join - Cross referencing tables in a mySQL query? -

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i have 2 tables. 1 table of users unique id field, , other table of data, column holds user id of whoever generated piece of data.

i want select data,genned_by datatable; want replace results genned_by select username users id = genned_by

so results query changes userid username corresponds other table.

i did research , figured inner join might i'm looking for, i'm left unsure of how use after reading it. help?

select datatable.data,users.username  datatable, users users.id = datatable.genned_by

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