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AskSQLTeam
Ask SQLTeam Question
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Posted - 2001-02-11 : 18:50:08
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Philip writes "This is a two-parter:
If I'm calling a stored procedure from ASP, which of the following procs (entire code not shown) would execute faster, assuming that the fields containing "ID" are primary keys and indexed in the respective tables...
Version 1:
SELECT @currentStepID = currentStepID FROM users WHERE userID = @userID
SELECT @currentStepURL = stepURL FROM steps WHERE stepID = @currentStepID
Note: @currentStepID is a local variable, @userID is an input parameter, @currentStepURL is an output parameter
Version 2:
SELECT @currentStepURL = s.stepURL FROM users u JOIN steps s ON u.currentStepID = s.stepID WHERE u.userID = @userID
Note: @userID is an input parameter, @currentStepURL is an output parameter
Part II:
How can I use the SQL Query Analyzer to compare the above? I plugged in both queries and performed an "Execution Plan," but can you provide some more insight on comparing "I/O cost", "CPU cost", "Subtree cost", etc.?
Thanks,
Philip Misiowiec Webficient LLC" |
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