Converting SQL from MSSQL to Oracle

Hi,
I have the following sql written in TSQL. I wanted to convert it into SQL so that i can use it in oracle.
select distinct DT_APPROVAL_GRP,dbo.MagicToDbBoolean(DT_MUST_BE_APPVD) as DT_MUST_BE_APPVD,DT_REVIEW_INTERVAL,DT_REVIEW_UNIT,
case DT_APPROVAL_GRP
when ' ' then '[NoGroup]'
else DT_APPROVAL_GRP
END + '['+cast(dbo.MagicToDbBoolean(DT_MUST_BE_APPVD) as varchar) + ']' +'[' cast( DT_REVIEW_INTERVAL as varchar) ']' +'[' + cast(DT_REVIEW_UNIT as varchar)+']' as ReviewModelCode from dt_document_Type, ag_approval_group WHERE (AG_NAME = DT_APPROVAL_GRP or DT_APPROVAL_GRP=' ' );
Thanks in advance.
Muneer

Hello
Case is more flexible than decode as you have more comparison operators at your disposal and you can combine multiple conditions in a single test, although for numbers and dates you can use decode with SIGN(arithmetic expression). You can nest decodes(as with case), but they can sometimes be difficult to understand if they're not formatted properly.
I have been told that decode is faster than case, but I haven't personally benchmarked it, so it could well be one of the many myths.
HTH

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-----------------------------------------Query--------------------------------------------------------------
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4 ETW000                                                                             389 0.171885
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4 ETW000                                                                            4056 0.199623
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4 ETW000                                                                            8145 0.222291
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4 ETW000                                                                             505 0.224337
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