Question

I have two columns that I would like to compare: the first column is a residential number that appears in the format of [phone], the second column appears in the format of 5555555555.00. I would like to compare the first 6 digits of each number in a third column that displaying TRUE if the first 6 digits match and false if they do not. I have the query done, but converting the columns to be in the same format is killing me. Any help on this?

Answer 1

In MySql, a quick solution would be like this:

SELECT
  col1,
  col2,
  CASE WHEN
    LEFT(
      REPLACE(REPLACE(REPLACE(REPLACE(col1, '(', ''), ')', ''), '-', ''), ' ', ''),
      6) = LEFT(col2,6)
    THEN 'True'
    ELSE 'False'
  END Matches
FROM yourtable

Please see this fiddle.