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An occasional chance, and reducing data to manageable levels
If there's a 1 in 5 (20%) chance of it being a dry day at the moment, a 20% chance of it not being freezing cold, and a 20% chance of me having a day that I'm not training or otherwise involved, then it follows (since the conditions aren't related) that there's just a 1 in 125 or less that 1% chance of all three co-inciding. A.k.a. "fat chance".  Which is why you would have found me and Lisa, yesterday, re-roofing the conservatory / store room in which newsletters, envelopes, cables and 101 other business supplies are kept. The plastic sheeting on the roof of this '60s addition to our place was - to put it mildly - life expired and there was a real danger of some of the things kept in there getting damaged so we simply couldn't wait for a co-incidence of three 1-in-5s. "Between showers" is, I think, the best way to describe what we did; it was a darned sight dryer that the last few days which have lead, once again, to the formation of Lake Melksham.Interestingly, SQL SELECT commands also use this principle of "a proportion of a proportion is a tiny bit of data" to reduce the amount of information supplied back to the using application by a database. In a select command, you specify which columns you want, and you also specify which rows you want. Which leads to a rapid data reduction. For example, if you have a 10 Mbyte database table and you select just 4 columns out of 20, and then just 100 rows out of 10000, your result set will be just 20k. (written 2005-12-04 10:35:57) Associated topics are indexed under S157 - More MySQL CommandsG100 - Well House Consultants - Introduction to Melksham
Some other Articles
Proof needed? Please just use common sense!Three life changing comments New Road Passport office - a much improved system An occasional chance, and reducing data to manageable levels Open source questions? Anyone can ask. MySQL - an FAQ Crazy Day-sies MySQL - JOIN or WHERE to link tables correctly? Exciting futures - the Well House Manor project |
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