IS it possible to use the 'Where' clause in SQL to only show a field containing only letters & Numbers?

Question

I want to be able to select only the field where a certain field contains both letters and numbers. for example:

Select [field1], [field2] 

from [db1].[tabl         


        

Answer 1

LIKE will do it. This is a double negative

where [field2] NOT LIKE '%[^0-9a-z]%'

It says:

• %[^0-9a-z]% means not (alphanumeric)
• NOT LIKE '%[^0-9a-z]%' means not(not(alphanumeric)) -> alphanumeric

Edit:

For all numbers... "it works"

SELECT 'it works' WHERE '1234567' NOT LIKE '%[^0-9a-z]%'

All letters

SELECT 'it works' WHERE 'abcdefg' NOT LIKE '%[^0-9a-z]%'

Contains non-alphanumeric

SELECT 'it works' WHERE 'abc_123' NOT LIKE '%[^0-9a-z]%'

Edit 2:

This solution is for

only alphanumeric, any mixture of letters and numbers

Edit 3:

letters followed by numbers

where [field2] NOT LIKE '%[^0-9a-z]%' AND [field2] LIKE '[a-z]%[0-9]'

Edit:

Finally, 2 letters and upto 3 numbers

where
   [field2] LIKE '[a-z][a-z][0-9]'
   OR
   [field2] LIKE '[a-z][a-z][0-9][0-9]'
   OR
   [field2] LIKE '[a-z][a-z][0-9][0-9][0-9]'