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I don't understand here Database schema documentation for the public data dump and SEDE the meaning of comments.score. Because I don't see any comment that has a score. So this means it is trivial field?

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Look on the left of this comment. It's the number of upvotes and it's called score. For comments without upvotes, it's score is 0 and is not displayed. – Portal Apr 10 '14 at 2:09
@AndrewT. Actually it's NULL until it gets incremented for the first time. ;) – animuson Apr 10 '14 at 2:12
@animuson And it's not null anymore even though I un-upvoted it. :P – hichris123 Apr 10 '14 at 2:13
How to upvote the comment? – Gerel tumen Apr 10 '14 at 2:13
On the left, on rollover, you have a top arrow (click to upvote) and a flag (to flag this comment as spam, offensive or unconstructive). – Fllo Apr 10 '14 at 2:16
@Fllo: where's the spam option? – Qantas 94 Heavy Apr 10 '14 at 2:24
@Filo Invisible to low-reps. – bjb568 Apr 10 '14 at 2:26
@Qantas94Heavy the little flag below the arrow display a popup with options (as rude or offensive,not constructive,obsolete,too chatty and other). I think you can add a comment to say you find that as a "spam". – Fllo Apr 10 '14 at 2:31
@Fllo: I know there's a popup, just wondered what you meant by the "spam" option. :) – Qantas 94 Heavy Apr 10 '14 at 2:34
@Qantas94Heavy Oh sorry (I meant a comment actually) :) - however, it's not from me, the title of the flag on rollover it's "flag this comment as unconstructive, offensive, or spam" – Fllo Apr 10 '14 at 2:40
You can't upvote a comment because you can't upvote anything yet. Earn 15 reputation somewhere, look for a comment and have fun! – Braiam Apr 10 '14 at 3:35
@Qantas It's the same for every site. – bjb568 Apr 10 '14 at 4:36
@bjb568: I thought it was when you were able to comment, my bad. – Qantas 94 Heavy Apr 10 '14 at 4:38

It is the number of upvotes (if any) that the comment got. Most comments don't get any, so you'd see nothing in that field for them.

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