Hi
Say you created a secondary index with sequence 'field1' 'field2' 'filed4' 'field3' in se11.
Then in your abap code, the sql statement should be, it will automatically use the secondary index.
SELECT *
FROM table
WHERE field1 = value1
AND field2 = value2
AND field4 = value4
AND field3 = value3.
regards,
Archer