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Level 5: The Mathematics of SQL: Part 2


Level 5: The Mathematics of SQL: Part 2

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Greg Larsen
Greg Larsen
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Comments posted to this topic are about the item Level 5: The Mathematics of SQL: Part 2

Gregory A. Larsen, MVP
Fiacre Lenehan
Fiacre Lenehan
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A very clear and informative article. A minor point is that the Figure numbers appear to be incorrect in the INNER Join Operator and OUTER JOIN Operator sections
Greg Larsen
Greg Larsen
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I reviewed the article text and your comment and I'm not following what part of the article has incorrect figure numbers. Would you please explain a little further so I can get the article corrected so it contains references to figures that a accurate.

Thank you
Greg

Gregory A. Larsen, MVP
Fiacre Lenehan
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"as shown in the Venn diagram in Figure 5" should this be Figure 3?
"INNER JOIN operation to return part 2 of Figure 6" should this be Figure 4?
Craig Thomson-419971
Craig Thomson-419971
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Thanks Gregory

It's always useful to review the basics.
I think a mathematical set regards any identical member as being the same thing, so in the diagrams there would only be one representative of any number.

I don't know where that leaves us with UNION ALL though, it seems to break the rules.

I'm happy to be corrected, I just scraped through my maths degree.

Craig
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