Based on the giving relation below called STUDENT, what are the outputs of the giving operations?...
Based on the giving relation below called STUDENT, what are the outputs of the giving operations?
- σAGE>18 (STUDENT)
- ∏ID (STUDENT)
|
ID |
Name |
Age |
Address |
|
111 |
Fahad |
18 |
RUH |
|
222 |
Mohammad |
20 |
JED |
|
333 |
Khaled |
22 |
ABH |
Homework Answers
a.The following is the selection operator which selects tuples i.e rows according to the given condition i.e Age>18 given here.So,it will select only those rows which have value>18.Output will be following-
ID Name Age Address
|
222 |
Mohammad |
20 |
JED |
|
333 |
Khaled |
22 |
ABH |
b.The following is the projection operator which is used to project the specified column i.e ID here from a relation i.e STUDENT here.So the ID column will be selected and the output will be following-
ID
|
111 |
|||
|
222 |
|||
|
333 |
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