The data is in AO_something_LexoRank, with an issue id so you can join it to jiraissue, but it's not going to be that helpful to you in raw SQL.
To know what board it is on, your SQL will have to read the board details to find out what the filter is, read the filter and reproduce it in SQL (bearing in mind that even the most "simple" query in JQL could require a many multiple joins), and then use it to select from the AO_lexorank table.
Once you've got that done, you need to understand the ranking data, and that's "fun" because it's not a simple number. At first glance, it does look like a simple string that you can sort alphanumerically, but that is the general case and it does not always work.
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