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Possible Duplicate:
What is wrong with Cursors ?
Why we say cursor will affect the performance. Even we use some other looping instead of cursors it works similarly right? Please advise
If your SQL is designed to work RBAR (Row-by-agonizing-row) then a Loop or Cursor will take a long time.
SQL is best with set data, work with sets instead of rows and your performance will generally increase.
If you rephrase your question or post some example SQL, we might be able to help more!