Question

I am applying join query to fetch data from database on my iPhone app.
See my query
"select A.a1, A.a2, B.b1, B.b2, C.c1, C.c2, from A LEFT OUTER JOIN B ON A.a3 = B.b3 AND A.a4 = B.b4 LEFT OUTER JOIN C ON A.a5 = C.c3 Where A.a6 = '%@'"

Here A contains more than 30K records, B has 20K records and C contains 200 records.
Is there any way to reduce the time taken to fetch the data?

NOTE : This query returns correct result.

Answer 1

In this case, you can use column indexes in the table. Following links point to as to how to create the indexes in Sqlite database.

1. creating the index
2. Same question answered here.

This might help you.