Question

Can anyone help me convert this code into Oracle SQL? Or please give me direction as to why this is throwing an error on Oracle SQL?

declare @PropertyName varchar(64)
set @PropertyName= 'ESRegion'
select PD.PropertyId,
PD.PropertyName,
convert(varchar(255), v.Value ) DisplayValue
from Property_Dictionary PD WITH(READUNCOMMITTED) 
inner join CorpTax_LookupDefinition l on l.Lookupkey = pd.ReferenceType
join MDTable md on l.DataDictionaryTypeId = md.TableGUID 
join ValueChar v on 
(
v.TableID = md.TableID 
and v.AttributeID = l.DisplayAttributeId 
)
where PD.DataTypeid = 7
and PD.PropertyName = @PropertyName

Answer 1

This should work:

select PD.PropertyId, PD.PropertyName, cast(v.value as varchar(255)) as DisplayValue
from Property_Dictionary PD inner join
     CorpTax_LookupDefinition l
     on l.Lookupkey = pd.ReferenceType join
     MDTable md
     on l.DataDictionaryTypeId = md.TableGUID join
     ValueChar v
      on v.TableID = md.TableID and
         v.AttributeID = l.DisplayAttributeId 
where PD.DataTypeid = 7 and PD.PropertyName = 'ESRegion'

As mentioned elsewhere, this is a bit different. It will invoke a read lock on the table. If you care about that, then you need to research different Oracle options for locking. I changed CONVERT to CAST. It is not clear what the type of v.value is, but this should work. (For some types, to_char() would be better.)

I also put the variable directly into the query. If you want variables, then you are outside the score of just SQL, and into the realms of PL/SQL and TSQL.