Convert nVarcher Data type Field to Datetime Data type in sqlserver 2005

Question

0.00/5 (No votes)

See more:

Hi,
I have got a existing project that have database field nvarchar but it should be date time data type.Now I want to convert it date time but without touch of front int side code.I have a large number of data in data base.I have tested another place,when I change data type I have missed all of my data.I am in a deep fix.
How can I handle this matter.How can i change database Field Type without loosing data.
I am a novice developer,so
Any help will make me grateful
Masud

Posted 16-Jun-10 22:23pm

Mahmudunnabi

Updated 16-Jun-10 23:44pm

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

shukla dhaval · Accepted Answer · 2010-06-16T23:07:00

You need to change your nvarchar data into datetime by using below line of code. It's only example how can you change your nvarchar to datetime.

SQL

DECLARE @strFirstDate   varchar(20),
    @strSecondDate  varchar(20)
SELECT  @strFirstDate   = '20060120112128',
    @strSecondDate  = '20060120112659'
SELECT  CONVERT(datetime, LEFT(@strFirstDate, 8) + ' ' + substring(@strFirstDate, 9, 2) + ':' + substring(@strFirstDate, 11, 2) + ':' + substring(@strFirstDate, 13, 2)),
    CONVERT(datetime, LEFT(@strSecondDate, 8) + ' ' + substring(@strSecondDate, 9, 2) + ':' + substring(@strSecondDate, 11, 2) + ':' + substring(@strSecondDate, 13, 2)),
    DATEDIFF(Minute,    -- Or Hours / Seconds / whatever
        CONVERT(datetime, LEFT(@strFirstDate, 8) + ' ' + substring(@strFirstDate, 9, 2) + ':' + substring(@strFirstDate, 11, 2) + ':' + substring(@strFirstDate, 13, 2)),
        CONVERT(datetime, LEFT(@strSecondDate, 8) + ' ' + substring(@strSecondDate, 9, 2) + ':' + substring(@strSecondDate, 11, 2) + ':' + substring(@strSecondDate, 13, 2))
        )

I hope it works for you.