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How should I have to take this ->
what is the meaning of that, because I don´t get it.
Explanation given in 4.6 section of above link
thnx Adya0711 for that usefull link
Hi Adya0711, could you please check the link. I got the "Page not Found" error.
thanks in advance
link has been removed, please repost a new link
The answer is 2 but I don't understand why.
because they have asked about attribute values...only two attributes are specified in the column
what are those 2 values
It will return only NAME and NUMBER from the table not SEX.
So the answer is 2.
why not sex , i think sex is a attribute too , can you explane for me !
Because in bracket only NAME and NUMBER is written ( after pi ).
I hope it is clear.
I think you guys are over thinking about it
What is the count of attributes (columns) returned in the following projection?
There are name and number, so there you have 2 columns/attributes.
I found this. Maybe it will help.
Is there a compiled list of which db operations corresponds to which notation?
So shouldn't the answer be 6.... 3 names n 3 numbers??
Projection means number of columns in a query.
select x, y, z from YourTable
x, y, z is the projection here.
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