how to max the datatype varchar value in sql server

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In database design as follows (table name company)
Fieldname Data Type
Compid (primary key) char(10)

In database record as follows (table name company)
Compid
1
2
3
4
5

i want to get max value of compid in company table.
for that how can i do using sql server.

Posted 20-Aug-15 5:39am

narasiman1

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PIEBALDconsult 20-Aug-15 11:44am

You really don't want to do MAX(Compid), you just don't. Use a proper ID and the correct techniques for working therewith.

Sergey Alexandrovich Kryukov 20-Aug-15 11:51am

Of you want arithmetic maximum based on numeric comparison, use numeric data type, not varchar.
—SA

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Wendelius · Answer 1 · 2015-08-20T08:03:00

Correct me if I'm wrong but there seems to be some fundamental problems in your approach.

First of all, why do you use a character data type for numeric values?
Always choose the data type based on the true underlying value type. In this case you'd probably want to use int or bigint.
Don't create unique values by yourself, let the database do the job for you. Searching for the maximum value and based on that generating a new key value requires additional and unnecessary roundtrips to the database which takes time. You have multiple choices for the key generation in the database:

uas e numeric data type and let the IDENTITY[^] definition to create new values for you
Use uniqueidentifier and define a NEWID[^] as the default value
Use a sequence[^] to generate new, unique values

ZurdoDev · Answer 2 · 2015-08-20T05:52:00

Solution 1

To get max you use the MAX function as PIEBaLDconsult says, but there is a good chance you are doing something wrong if you are doing this.

However,

SQL

SELECT MAX(Compid) AS MaxCompId FROM table

Posted 20-Aug-15 5:52am

ZurdoDev