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Attributes in the group by clause having tuples with the same value are placed in
- One group
- Two groups
- Multiple groups
- No groups
Aggregate functions can be applied over a group of sets of tuples instead of just single tuple by using the clause
- By Grouped clause
- Group by clause
- Merge clause
- Sync clause
The aggregate function count of an empty collection is said to be
- Always unity
- 0
- Infinite
- Unknown
Built-in aggregate functions defined by SQL, ignore null values for their input collection, except the
- Sum
- Avg
- Min/max
- Count(*)
The attributes specified in the group by clause of the SQL statement, are used to form
- A single value
- Multiple values
- Groups
- Multiple relations
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