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What happenif we run sql statement Expand / Collapse
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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
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

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Post #1431935
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