MySQL Remove first two characters of all fields

UPDATE d1
SET d1_val = SUBSTRING_INDEX(d1_val , ":",-1);

Does the job also, leaves "N/A" as it is.

More safe query regarding multiple executes is using LIKE '_:%':

UPDATE d1
SET d1_val = SUBSTRING(d1_val, 3)
WHERE d1_val LIKE '_:%'

It will change every line which looks like C:10, E:100 etc. but not 10, 100 after one previous query run.

(Assuming there is always one letter before :. If more - use LIKE '%:%')

Try

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

use SUBSTRING(column_name, character_to_remove)

Solution,

SUBSTRING(d1_val, 3)

Note: you can use it on SELECT or UPDATE statement

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