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Window aggregation
Supported by ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
                                                Every aggregate function can be turned into a window function simply by appending the OVER() clause.
                                            
For example:
- 
COUNT(*) OVER () - 
SUM(x) OVER () - 
MAX(x) OVER () - ...
 
This also includes user-defined aggregate functions!
        
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