Subtracting two numbers

10 pts.
Tags:
SQL
SQL macros
SQL Query
Hi Using SQL, how can I subtract two values for the same parameter received at different times say 1am and 1:30am so sql to do value(1:30am)-value(1am)=? Regards

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You will need to provide more information.

What database are you using ?
What are your table structures ?

When you say ‘value(1:30am)’, you mean something like the following ?

<pre>SELECT value
FROM yourTable
WHERE otherColumn = ’1:30′</pre>

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