sql server - return a default record from a sql query -

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i have sql query run against sql server database eg.

select * mytable id = 2

this may return number of records or may return none. if returns none, alter sql query return default record, possible , if so, how? if records returned, default record should not returned. cannot update data need alter sql query this.

another way (you empty initial rowset returned);

select * mytable id = 2 if (@@rowcount = 0)    select ...

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