Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

How to get results with CTE query rahter than Loop

Posted on 2014-02-23
1
Medium Priority
?
364 Views
Last Modified: 2014-02-28
I have created a stored procedure with loops that gives me the output I need, but it is slow. I have tried to use a CTE query, but do not know how to create the TotalSamples. The CTE creates the same number of rows as the looped query, but does not calculate TotalSamples. TotalSamples should be the distinct samplekey by site, collectionYear, germinationYear, plot, habitat
speciesBySiteTeatmentWithLoop.sql
speciesBySiteTreatment.sql
sampleSeedbank50.csv
createSeedbank.sql
siteTreatmentSpeciesSampleOutput.csv
siteTreatmentSpeciesOutputCTE.csv
0
Comment
Question by:dblankman
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 46

Accepted Solution

by:
Kent Olsen earned 2000 total points
ID: 39880842
Hi Blankman,

A CTE won't necessarily replace a store procedure or the necessity of looping on data.  What the CTE does is allow you to break a complex query into smaller pieces and reuse some of the intermediate results without the database rebuilding those results.

If you can't visualize a query that will do what you want, neither a complex query nor a CTE will do what you want any better than your stored procedure.


Kent
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
This month, Experts Exchange sat down with resident SQL expert, Jim Horn, for an in-depth look into the makings of a successful career in SQL.
Via a live example, show how to extract information from SQL Server on Database, Connection and Server properties
This videos aims to give the viewer a basic demonstration of how a user can query current session information by using the SYS_CONTEXT function

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question