Code Review

  • Need assistance. My code is returning nothing. I think I left join out of place. I have been looking at this for two days anyone who thinks they can see a mistake in the code any help would be appreciated. If you also can see a way to stream line this that would be great input too. The Format on CHAR and CAST and CASE are Required cant change.

    Select

    Cast(e.firstname As [Char](50)) 'Benefiticary First Name',

    ci.contracted,

    Cast(e.lastname As [Char](60)) 'Benefit Last Name',

    ek.carriermemid 'Cardholder ID',

    bp.CmsContractId 'Contract ID',

    bp.upid 'Plan ID',

    c.claimid,

    Case When ci.contracted = 'Y' Then 'CP' Else 'NCP' End As 'Provider Type',

    Case When cp.claimid = c.claimid Then 'N' Else 'Y' End As Clean,

    Convert([Char](10),c.cleandate,111) 'Date the request was received',

    ICD.codeid 'Diagnosis',

    Convert([Char](10),c.paiddate,111)

    'Date written notification provided to provider',

    Case When claimdetail.paydiscount = '0.00' Then 'N' Else 'Y'

    End As [Was intrest paid on the claim],

    con.description 'First Tiet Downstream and Related Entity',

    c.status As [Request Disposition],

    c.claimid,

    Replace(Replace(Stuff((Select

    *

    From

    (Select

    CEM.overridemessage As '_'

    From

    claimeditmessage CEM With(NoLock)

    Where

    c.claimid = CEM.claimid

    Union All

    Select

    Convert(varchar(255),OM.overridemessage) As '_'

    From

    claimremit OM With(NoLock)

    Where

    c.claimid = OM.claimid

    Union All

    Select

    CE.remitoverridemessage As '_'

    From

    claimedit CE

    Where

    c.claimid = CE.claimid) As k

    For Xml Path('')), 1, 0, ''), '<_>', ''), '</_>', Char(13) + Char(10)) As

    [Remit Description],

    Convert([Char](10),c.okpaydate,111) 'Date the claim was paid or denied',

    categoryservice.description As description1

    From

    claim c Left Join

    benefitplan bp With(NoLock)

    On bp.planid = c.planid Left Join

    (Select Distinct

    cp.claimid

    From

    claim cp With(NoLock) Join

    claimedit ce With(NoLock)

    On cp.claimid = ce.claimid Join

    claimpendhistory ch With(NoLock)

    On ce.claimid = ch.claimid

    Where

    cp.status Not In ('VOID', 'REVERSED', 'REVSYNCH') And

    ce.ruleid = '913' And

    ch.pendreasonid In ('CN', 'OR', 'OI')) cp

    On cp.claimid = c.claimid Left Join

    enrollkeys ek With(NoLock)

    On ek.enrollid = c.enrollid Left Join

    claimdiag ICD With(NoLock)

    On c.claimid = ICD.claimid And ICD.diagtype = '1' Left Join

    (Select

    ch.claimid,

    ch.orgclaimid

    From

    claim ch) ch

    On ch.claimid = c.claimid Left Join

    member m With(NoLock)

    On m.memid = c.memid Left Join

    entity e With(NoLock)

    On e.entid = m.entityid Left Join

    program p With(NoLock)

    On p.programid = ek.programid Left Join

    affiliation a With(NoLock)

    On a.affiliationid = c.affiliationid Left Join

    contractinfo ci With(NoLock)

    On ci.affiliationid = a.affiliationid And ek.programid = ci.programid And

    Cast(c.startdate As date) Between Cast(ci.effdate As date) And

    Cast(ci.termdate As date) Left Join

    contract con With(NoLock)

    On ci.contractid = con.contractid Left Join

    provider rend With(NoLock)

    On rend.provid = c.provid Inner Join

    payment

    On payment.memid = m.memid And payment.claimmemid = m.memid And

    payment.programid = p.programid And payment.provid = rend.provid Inner Join

    provcos

    On provcos.provid = rend.provid Inner Join

    categoryservice

    On provcos.cosgrp = categoryservice.cosgrp Inner Join

    claimdetail

    On claimdetail.claimid = c.claimid

    Where

    c.status In ('PAID', 'DENIED') And

    Cast(c.paiddate As date) Between '2016-03-03' And '2016-04-14' And

    ek.carriermemid <> ' ' And

    c.resubclaimid = ' ' And

    Left(c.claimid, 11) Not In (Select

    Left(c.claimid, 11)

    From

    claim

    Where

    Left(Right(RTrim(c.claimid), 2), 1) In ('R', 'A'))

    Order By

    'Contract ID'

  • Maybe someone else will dig through your code but after 64 visits and 42 posts I'm sure you've heard the lecture about DDL and consumable data. Not providing that makes it much harder than it should be to help you. That said, here's some general tips:

    Start form the beginning of your query and end at "FROM claim c". Comment out any columns that don't come from claim. You getting data? If not, then there's your problem, if so, add the the "Left Join benefitplan bp On bp.planid = c.planid "... Still getting data? No? then there's your problem. Yes? then keep adding stuff until you stop getting data. That's how you troubleshoot this type of thing. You can also comment out the conditions in your WHERE clause; e.g. comment out "c.status In ('PAID', 'DENIED') " and see if that helps isolate the problem, widen your date range, stuff like that.

    Some things I'd fix if you want good, accurate code that returns data in a timely fashion:

    1. The NOLOCK hints prevent you from getting the correct data every time the query is run. If that's ok then leave them there.

    2. Order By 'Contract ID'... What problem does that solve? If you don't have a good answer that, lose it.

    3. Stuff like "Left(c.claimid, 11) Not In..." in your WHERE clause keeps you query from being able to get an index seek or even utilize otherwise helpful indexes which slows you down a makes your query a bigger drag on your system.

    4. When you have a dozen Left joins to return a dozen columns there's something tragically wrong with your data model. If you can't fix it the consider some indexed views or ETL into a reporting DB, data mart or something similar.

    "I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code."

    -- Itzik Ben-Gan 2001

  • This:

    ek.carriermemid <> ' '

    In the WHERE clause is going to turn that LEFT JOIN into an INNER JOIN. Move it into the ON clause in order to retain the LEFT JOIN

    Casting your date the way you're doing is absolutely going to create performance issues that you can't get around. It's going to scan the table, no choice. I actually wrote a blog post[/url] about just this issue this week.

    "The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
    - Theodore Roosevelt

    Author of:
    SQL Server Execution Plans
    SQL Server Query Performance Tuning

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