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Sample: There is a table with 3 columns, c1, c2 and c3. 

- c1 is the PK. 
- c2 is empty.
- c3 is same data type as c2 and empty.

How to write a sql statement to copy values in c3 to c2 for all rows accordingly?

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    If both c3and c2are empty, what's the point of copying between them? Anyway, you want an update statement as suggested by @TechDo Commented Nov 15, 2013 at 7:19

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Please try:

UPDATE YourTable
SET C2=C3
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