Question

In SQL server query analyzer, for executing stored procedure we use exec/execute command followed by name of the proc. In the same way what is the command line/execute statement for ‘select’ command. How this is handled internally by query analyzer.

Thanks in advance,

Pradeep

Answer 1

RE:

How this is handled internally by
query analyzer.

This is a highly abbreviated summary of a section from the book “Professional SQL Server 2008 Internals and Troubleshooting“

1. The SQL Server Network Interface (SNI) on the client establishes a connection to a TDS endpoint and sends the SELECT statement as a TDS message.
2. The SNI on the server unpacks the message and passes the SQL Command to the Command Parser
3. The command parser checks if a suitable plan exists in the cache. If not it creates a query tree and passes it to the optimizer.
4. The optimizer generates a query plan. (If required)
5. The Query Executor processes the query.
6. The results are sent back to the client using the TDS protocol.

It looks as though this page has considerably more details about some of these steps.