Question

I have some query on a table which can be sorted by any of several columns, and an id of a row in the resultset. How can I get the next or previous records (or the offset of the id in the complete resultset).

ie.
let’s say I have the following table

ID First_Col Second_Col Name
1   34        24         John
2   40        22         James
3   48        5          Hugh

If sorting by first_col, and given id 2, the next record would be 3, but if sorting by Second_Col, the next record would be 1.

Given the sortBy expression (which is passed to my function), and the id, how can I find the next record easily?

Answer 1

This should work:

SELECT
*
FROM
names
WHERE
Second_Col > (SELECT Second_Col FROM names WHERE ID = 2)
ORDER BY
Second_Col 
LIMIT 1

See http://www.sqlfiddle.com/#!9/a84e9c/1