Question

If I have a varchar column which has the length 30:

[SpecificCode] –> varchar(30) in a db table called [Item]

And if I have to query this table rows to obtain all the rows which have

SpecificCode between 789 and 15000

What may be the fastest way to SELECT in TSQL? (Range test is needed on a varchar field with length 30)

SELECT *
FROM Item
WHERE Item.SepecificCode --how to filter between 789 and 15000?

Answer 1

Assuming the column is full of non-numeric rubbish but no decimals

SELECT *
FROM Item
WHERE
    RIGHT('00' + Item.SpecificCode, 5) BETWEEN '789' and '15000'
    AND
    ISNUMERIC(Item.SpecificCode) = 1;

If just integers

SELECT *
FROM Item
WHERE
    CAST(Item.SpecificCode AS int) BETWEEN 789 and 15000;

If floats too:

SELECT *
FROM Item
WHERE
    CAST(Item.SpecificCode AS float) BETWEEN 789 and 15000
    AND
    FLOOR(CAST(Item.SpecificCode AS float)) = CAST(Item.SpecificCode AS int)