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Analysing a T-SQL Query


Analysing a T-SQL Query

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JayK
JayK
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Comments posted to this topic are about the item Analysing a T-SQL Query
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
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Good "back to basics" question.

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Kari Suresh
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Good Question to analysis..

KSB
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Thousands of candles can be lit from a single candle, and the life of the candle will not be shortened. Knowledge and happiness never decreases by being shared.” - Buddha
SQLRNNR
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This is a good question. Thanks. One other method one can use to demonstrate this is by evaluating the actual execution plan.

Jason...AKA CirqueDeSQLeil
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Daniel Bowlin
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Really interesting question and explanation, thanks.
Trey Staker
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Great question, made me work for my points.

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Oleg Netchaev
Oleg Netchaev
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CirquedeSQLeil (5/5/2010)
This is a good question. Thanks. One other method one can use to demonstrate this is by evaluating the actual execution plan.

Very good question, thank you. I did not try running the sample yet but I suspect that because the query is pretty simple, highlighting it in SSMS and hitting CTRL + L (to let SSMS show estimated plan) will do the trick as well because there should not be any differences between actual and estimated plans in this case.

Oleg
JayK
JayK
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Just noticed a typo in the question.

The first line of text should read "non clustered index on EmailAddress" and not "non clustered index on LastName".....this script itself is OK....
SQLRNNR
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Oleg Netchaev (5/5/2010)
CirquedeSQLeil (5/5/2010)
This is a good question. Thanks. One other method one can use to demonstrate this is by evaluating the actual execution plan.

Very good question, thank you. I did not try running the sample yet but I suspect that because the query is pretty simple, highlighting it in SSMS and hitting CTRL + L (to let SSMS show estimated plan) will do the trick as well because there should not be any differences between actual and estimated plans in this case.

Oleg


That is likely true - haven't tried. I am just accustomed to asking for the actual execution plan that it seemed the safer route for this too.;-)

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ColdCoffee
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Wonderful question and equally wonderful explanation. The basics is hit in the nail! Thanks for this!
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