Yes/No/Tickybox [Matthew's Journal]

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Since SQL has not been my friend today...

[Poll #1455301]

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There are 8 comments on this entry. (Reply.)

Should that be True, False and File Not Found? ;)

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Unknown

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Tickybox

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I hate it when it comes to predicate optimisation, and bug reports from people who don't love it.

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I boggled when I first was doing excel macros and discovered that there were the visibility options visible, hidden and very hidden.

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Any kind of logic is all right with me, it's things completely lacking in logic that I'm not generally so keen on :)

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Of course the only sensible answer is yes and no. There are many times when I've thought SQL should have a MAYBE operator to go with LIKE and SOUNDEX, but I keep wanting to SELECT UNTO things.

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I meant to say- if you think SQL is bad, R uses an inconsistent ternary logic model. Witness:

> NA & TRUE
[1] NA
> tmp <- c(1,2,3,NA)
> tmp>=3
[1] FALSE FALSE TRUE NA
> tmp[tmp>=3]
[1] 3 NA

Yes, that's right, the array selection syntax treats NA as TRUE.

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Matthew's Journal

Yes/No/Tickybox

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July