SQL Case Decimal Between - sql

Question

In my database I have an entry like: 'V2.0.0.0 VersionData'
I need my case statement to look at this value, trim off from the space onwards and remove the V at the start leaving '2.0.0.0, the case statement should then return 'Pass' if its greater than 2.0.1.0 else 'Fail'
This is what I have so far but it doesnt work:
Select
CASE
When (Select
Convert(Decimal(4,4),
REPLACE(
LEFT(EntryValue,
CHARINDEX(' ', EntryValue) - 1),'v',''))
from table where entrytype = 'VERSION') BETWEEN 0 and 2.1 THEN 'Pass'
Else 'Fail'
END [V-Check]

Answer 1

Your problem is that
declare #EntryValue varchar(250)='V2.0.0.0 VersionData'
Select REPLACE(LEFT(#EntryValue,CHARINDEX(' ', #EntryValue) - 1),'v','')
--2.0.0.0
You do not have a string that can be intepreted like a decimal.
Without knowing how your version numbering Works, a solution can not be found,
For instance is V2.11.0.0 possible? If so, then is V2.5.0.0 a a lower or higher version?
If you convert 2.11.0.0 to the decimal 2.11 then it will be lower than 2.5
In what I think would be the default intepretation of the version number, you do not have a single number, but 4 numbers you have to compare consecutively to get a result.
One of many ways to parse out the numbers in the version would then be:
declare #EntryValue varchar(250)='V2.0.0.0 VersionData'
;with cte as
(
select charindex('.',#EntryValue) p1
,charindex('.',#EntryValue,charindex('.',#EntryValue)+1) p2
,charindex('.',#EntryValue,charindex('.',#EntryValue,charindex('.',#EntryValue)+1)+1) p3
,charindex(' ',#EntryValue) p4
)
select substring(#EntryValue,2,p1-2)+0 [MajorVersion]
,SUBSTRING(#EntryValue,p1+1,p2-p1-1)+0 [MinorVersion]
,SUBSTRING(#EntryValue,p2+1,p3-p2-1)+0 [BugFixRelease]
,SUBSTRING(#EntryValue,p3+1,p4-p3-1)+0 [Build]
from cte
If the numbers cannot be larger than 10, then you have an easy task, then you can just use a simple compare
select case when 'V2.1.0.0 VersionData'>= 'V2.0.1.0 VersionData' then 1 else 0 end
Since the lexicographical ordering of the characters would ensure that the result is correct.
-- Added in edit
If you have up to 4 numbers in your version, then you can abuse the internal function PARSENAME to get the numbers in an easier fashion:
declare #EntryValue varchar(250)='V2.0.0.0 VersionData'
select
parsename(stuff(left(#EntryValue,charindex(' ',#EntryValue)),1,1,''),4)+0 MajorVersion
, parsename(stuff(left(#EntryValue,charindex(' ',#EntryValue)),1,1,''),3)+0 MinorVersion
, parsename(stuff(left(#EntryValue,charindex(' ',#EntryValue)),1,1,''),2)+0 Release
, parsename(stuff(left(#EntryValue,charindex(' ',#EntryValue)),1,1,''),1)+0 Build

Answer 2

One problem is that converting a string '2.0.1.0', which contains several .-characters will not properly convert into 2010 (as you might intend).
However, if you can guarantee that you always have exactly 4 version parts and each version part is between 0..9, i.e. there is no version like, for example, 2.0.11.0' or2.0.1.0.9', then the following solution should work. It simply relies on the order of string values, which - above mentioned restriction concerning version parts guaranteed - is just as if you compared integral values:
with versions as
( select entryValue, Substring(LEFT(EntryValue,
CHARINDEX(' ', EntryValue)),2,100) as versionStr
from (values
('V2.0.0.0 some older version'),
('V2.0.1.0 sufficient version'),
('V2.0.1.9 newer version')
) as versionTable(entryValue)
)
select *, (case when versionStr >= '2.0.1.0' then 'Pass' else 'Fail' end) as "check"
from versions;