Question

I have a field named VALUE of VARCHAR2 type

The string is in this format: yyyy-mm-dd
Is it possible to change it to: dd-mm-yyyy

An then (again if possible) to convert it to date in this format?

What I have tried is:

SELECT convert(varchar, getdate(), 110)

but it’s only for the current time. Is there a way to do this?

Edit:
Here my code is:

select
p1.VALUE as Sdate
from Process p 
LEFT JOIN PARAMETER p1 on p1.WP_ID=p.ID AND p1.NAME = 'Sdate'
WHERE p.TYPE = 'Marketing' and convert(varchar, convert(date,p1.value), 103) ='22.08.2012'

Answer 1

104 will convert in dd.mm.yyyy format

SELECT CONVERT(VARCHAR, GETDATE(), 104)

Your query should be:

SELECT p1.VALUE AS Sdate
FROM Process p 
LEFT JOIN PARAMETER p1 
       ON p1.WP_ID = p.ID 
      AND p1.NAME = 'Sdate'
WHERE p.TYPE = 'Marketing' 
  AND CONVERT(VARCHAR, CONVERT(DATE, p1.value), 104) = '22.08.2012'

See an example in this SQLFiddle.

Note that you should keep the column type as DATE where you want to store dates. Also, always prefer yyyyMMdd format.

Have a look at CAST and CONVERT (Transact-SQL)