SQL : SQL if select statement returns no rows then perform alternative select statement

SQL : SQL if select statement returns no rows then perform alternative select statement

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SQL : How to make a select statement return null if no value is returned?
SQL : How to make a select statement return null if no value is returned?
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SQL : How to make a select statement return null if no value is returned?

SQL : How to make a select statement return null if no value is returned?
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