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Query displaying diffrence between highest and lowest salarys?

576484May 8 2007 — edited May 8 2007
I need to write a query that will display the difference between the highest and lowest salaries. Label the column DIFFERENCE.

It should look something like so. I have no idea what to type in SQL plus to get this.

DIFFERENCE
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4200
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Locked on Jun 5 2007
Added on May 8 2007
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