Question: For completing the tasks mention below you must login to Hr schema You must create a spool to show your result 1.Display NULL Values in

For completing the tasks mention below you must login to Hr schema

You must create a spool to show your result 

1.Display NULL Values in Aggregate Functions in Employee table

2.Display Nested Aggregate Functions in Employee table

3.List of SQL Aggregate Functions show the results using any table from Hr schema.

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