MySQL Remove first two characters of all fields

Question

I have some data that looks like this:

C:10
R:200
N/A
E:3
N/A
N:77

I'm trying to remove the first two characters for each row, and skip the rows with N/A I've been trying to figure out how to do this with SUBSTRING but have had no luck.

UPDATE d1
SET d1_val = SUBSTRING(d1_val, 1, LENGTH(d1_val)2)

Answer 1

Try

UPDATE d1
SET d1_val = SUBSTRING(d1_val, 3)
WHERE d1_val <> 'N/A'