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Which relational algebraic operation is used to select specific columns (attributes) from a
relation?
Suggested Answer: C
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27 comments · newest first
ER
Erinn
5 months ago
I agree, Projection is used for that. It’s clear in the definitions.
NG
Nguyet
5 months ago
I was confused between Projection and Union, but Projection makes sense.
RO
Robt
5 months ago
Yeah, Projection is definitely the right choice. It selects specific columns.
BE
Bettye
6 months ago
I think it's C) Projection.
MA
Marva
6 months ago
Projection is the one that selects columns, no doubt!
NA
Natalie
6 months ago
Wait, are you sure it's not D) Intersection?
KI
Kimberely
6 months ago
Totally agree, C) Projection is the right answer!
SA
Sarah
6 months ago
I thought it was A) Union at first.
DA
Dante
7 months ago
It's definitely C) Projection.
AI
Ailene
7 months ago
Projection, all the way. Anything else would just be a hot mess.
JE
Jennifer
7 months ago
Projection is the way to go. Gotta keep things streamlined, you know?
FA
Farrah
7 months ago
Projection is the way to go. Wouldn't want to end up with a bunch of extra columns, am I right?
ER
Erasmo
8 months ago
Projection, definitely. Anything else would just be a mess.
PH
Phuong
8 months ago
Hmm, I'd say Projection is the way to go. Keeps things nice and tidy.
CO
Cordelia
8 months ago
Projection, of course! Gotta get those specific columns, am I right?
VI
Vilma
8 months ago
I feel like Projection is the answer, but I might confuse it with something else like Selection, which is for rows.
SH
Shawnda
8 months ago
Union and Intersection are definitely for combining sets, but I can't recall if Projection is the exact term for selecting columns.
DE
Desiree
9 months ago
I remember practicing a question similar to this, and I believe Projection was the right answer.
WA
Wai
9 months ago
I think the operation for selecting specific columns is called Projection, but I'm not entirely sure.
FA
Fannie
9 months ago
I'm a little unsure between the projection and intersection operations here. I know projection has something to do with selecting columns, but I can't quite remember the details. I'll have to review my notes before answering this.
MA
Malcom
9 months ago
The projection operation, that's the one I was thinking of. It lets you choose which attributes or columns you want to keep from a relation. I feel confident about this one.
DE
Detra
9 months ago
Okay, I remember learning about the different relational algebra operations. I'm pretty sure the projection operation is the one that allows you to select specific columns from a relation. I'll mark that as my answer.
JA
Jani
9 months ago
Hmm, I'm a bit confused on this one. Is it the projection operation that selects columns? Or maybe it's the union operation? I'll have to think this through carefully.
TW
Twila
10 months ago
I think the projection operation is used to select specific columns from a relation, but I'm not 100% sure.
GR
Gracia
3 months ago
Definitely! Projection is the right choice.
KR
Kris
3 months ago
Yeah, Projection makes sense for selecting columns.
JE
Jerry
4 months ago
I believe it's Projection too!