How to subtract the same amounts to all values in a column?

I was wondering 开发者_如何学编程if I can subtract the same value (offset) to all values of a specific column in my table.

For example I have:

Col1
------
34
35
36

I want to make it:

Col1
------
24
25
26

What's the SQL code for doing it ?

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Are you just doing this for display, or do you want to update the table with the reduced values?

In the first case:

select (Col1 - 10) from table

In the second (assuming you want to update ALL rows):

update table set Col1 = (Col1 - 10)

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How about:

 SELECT (MyCol - 10)
 From MyTable