loop through rows of one csv file to find corresponding data in another

Question

I got an interesting problem:

file1.csv has a few hundred rows like:

Code,DTime
1,2010-12-26 17:01
2,2010-12-26 17:07
2,2010-12-26 17:15

Answer 1

Unless you only need to do this once, you should really use a database. Add a column to table2 that contains DATETIME without the seconds, so that you can join on exact matches, not with LIKE.

It WILL be fast, and even faster if you index those columns. And if you can store file1.csv in the database too, you don't need iterations: You can get the entire set of results in a single select query. This is the kind of stuff SQL is made for.

PS. If you decide to pursue this approach, you can ask for help with the query.