Filter IDs with just numbers excluding letters - sql

Question

So I have results that begins with 2 letters followed by 3 numbers, for example:
ID_Sample
AB001
BC003
AB100
BC400
How can I do a query that ignores the letters and just looks up the numbers to do a filter? For example:
WHERE ID_Sample >= 100
I tried using a "Replace" to get rid of known letters, but I figured there might be a better way. For example:
Select
Replace(id_sample,'AB','')
Choosing the 3 numerals on the right would work too.

Answer 1

For your sample data, you can just start at the third character and convert to a number:
where try_convert(int, stuff(ID_Sample, 1, 2, '')) > 100
Or, if you know that the number is 3 characters:
where try_convert(int, right(ID_Sample, 3)) > 100

Answer 2

+1 for Gordon's answer. This is a fun problem that you can solve using TRANSLATE if you're using SQL 2017+.
First, in case you've never used it, Per BOL TRANSLATE:
Returns the string provided as a first argument after some characters
specified in the second argument are translated into a destination set
of characters specified in the third argument.2
This:
SELECT TRANSLATE('123AABBCC!!!','ABC','XYZ');
Returns: 123XXYYZZ!!!
Here's the solution using TRANSLATE:
-- Sample Data
DECLARE #t TABLE (ID_Sample CHAR(6))
INSERT #t (ID_Sample) VALUES ('AB001'),('BC003'),('AB100'),('BC400'),('CC555');
-- Solution
SELECT
ID_Sample = t.ID_Sample,
ID_Sample_Int = s.NewString
FROM #t AS t
CROSS JOIN (VALUES('ABCDEFGHIJKLMNOPQRSTUVWXYZ', REPLICATE(0,26))) AS f(S1,S2)
CROSS APPLY (VALUES(TRY_CAST(TRANSLATE(t.ID_Sample,f.S1,f.S2) AS INT))) AS s(NewString)
WHERE s.NewString >= 100;
Without the WHERE clause filter you get:
ID_Sample ID_Sample_Int
--------- -------------
AB001 1
BC003 3
AB100 100
BC400 400
CC555 555
... the WHERE clause filters out the first two rows.

Answer 3

Check these methods- Unit test also done!
Declare #Table as table(ID_Sample varchar(20))
set nocount on
Insert into #Table (ID_Sample)
Values('AB001'),('BC003'),('AB100'),('BC400')
--substring_method
select * from #Table
where try_cast(substring(ID_Sample,3,3) as int) >100
--right_method
select * from #Table
where try_cast(right(ID_Sample,3) as int) >100
--stuff_method
select * from #Table
where try_cast(stuff(ID_Sample,1,2,'') as int) >100
--replace_method
select * from #Table
where try_cast(replace(ID_Sample,left(ID_Sample,2),'') as int) >100