Searching a table technique


I have an SQL database with a table that has about 20 columns and about 30 rows.

I need to perform a search on the whole table based on the values from one row: I need to find what other rows have similar values with the row that I base my search on. The similarities can vary from 1 column to all 20 columns.

I am not very experienced with SQL, I only know the some basic things and I need help in writing the code to perform the search (PHP).

Please help.

Thank you.