What happenif we run sql statement

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What happenif we run sql statement

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suresh0534

Posted Saturday, March 16, 2013 12:27 PM

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Hi,
What happened if we run select statement i.e

Select * from TableName;

When we execute the above sql statement what is happened Internally?

Post #1431934

GilaMonster

Posted Saturday, March 16, 2013 12:30 PM

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The query optimiser generates an execution plan, which in this case is a trivial plan that just contains the table scan and select operators. The query execution engine executes that execution plan, requesting every single row in the table from the storage engine, then returning that to the client.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

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