Some SQL facts

1. An aggregate function does not accept sub query as an input.
Example
Having sum (select ...)>5
2. Processing order for 'ON' and 'WHERE'
          a)ON
           b)WHERE
3.'Distinct' and 'Order by ' can't be used in the same query.
4. Table is organised in one of these ways (Heap ,B-tree).Table organization is called "HOBT"
5. Extent has 8 pages. Each page has 8kb.

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