[O] how to compare strings of two columns for huge tables

[Uwe Brauer]

Hi

I have tables (several hundred rows) like this


| 03217428 |  3217428 |   |
| 71310606 | 71310606 |   |
| 05944371 |  5944371 |   |
| 70086251 | 70086251 |   |
| 50325182 | 50325182 |   |
| 04559101 |  4559101 |   |
| 51005420 | 51005420 |   |
| 51141846 | 51141846 |   |
| 05448640 |  5448640 |   |
| 06602597 |  6602597 |   |
#+TBLFM: $3=if("$1" == "$2", string("OK"))

So I would like to add a new column, which would return OK, if the
strings of each row of the to columns coincide. I tried 
#+TBLFM: $3=if("$1" == "$2", string("OK"))

But it did not work. I googled and looked up the manual, no help.

It seems a common problem for spreadsheet so I presume there must be an
solution but I am unable to find it and would appreciate any help.

Thanks 

Uwe Brauer