Hello SAS Community, I'm a relatively new SAS programmer and I really need your help coding this!  I have a dataset that contains 5 columns, each representing a different disease diagnosis date in date format (date9.).  Some columns contain missing values.  I need to compare the diagnosis dates across these 5 columns when the value is not missing and flag or print out the earliest diagnosis date variable. Essentially, to find which disease diagnosis occurred first and flag that.    Is there an easy way to code this?  See my sample data and expected output below. Thank you so much for your help!!   Data Example: ID Diag1 Diag2 Diag3 Diag4 Diag5 1 26-Oct-17   28-Oct-18 26-Mar-19   2 . . . . . 3 22-Dec-21 . . . . 4 . . . 10-May-21 13-Nov-22 5 15-Oct-19 15-Oct-19 . 24-Jun-15 23-Oct-17 6 25-Dec-16 14-Oct-18 24-Nov-22 26-Dec-15 23-Oct-23   I would like the output to be as follows: ID Diag1 Diag2 Diag3 Diag4 Diag5 Flag 1 26-Oct-17   28-Oct-18 26-Mar-19   Diag1 2 . . . . . Disease Free 3 22-Dec-21 . . . . Diag1 4 . . . 10-May-21 13-Nov-22 Diag4 5 15-Oct-19 15-Oct-19 . 24-Jun-15 23-Oct-17 Diag5 6 25-Dec-16 14-Oct-18 24-Nov-22 26-Dec-15 23-Oct-23 Diag4         ... View more