However, it is something to be aware of if you ever find yourself doing this for serious security code. so much so that in most cases the bias is nearly undetectable. Thankfully, the actual range of the Int type is much larger. You can see here that there are more chances to produce some numbers than others: bias. Below is the entire possible set of results for our imaginary integer range:Ĭhecksum Integer: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 It's easier to demonstrate this visually. Cluster sampling- she puts 50 into random groups of 5 so we get 10 groups then randomly selects 5 of them and interviews everyone in those groups -> 25 people are asked. Those numbers would be heavily favored over 6-13, because CHECKSUM() is twice as likely to generate them. When CHECKSUM() results in 14-19, these correspond to results 0-5. 19 is the largest possible integer you can hold. Any time you get a number between the maximum possible integer and the last exact multiple of the size of your desired range (14 in this case) before that maximum integer, those results are favored over the remaining portion of your range that cannot be produced from that last multiple of 14.Īs an example, imagine the entire range of the Int type is only 19. However, there will be some bias when CHECKSUM() produces a number at the very top end of that range. CHECKSUM() results in numbers that are uniform across the entire range of the sql Int datatype, or at least as near so as my (the editor) testing can show. If you do it wrong, it's possible to double-count the number 0.Ī small warning for the math nuts in the room: there is a very slight bias in this code. Be extra careful if you need a range that includes both positive and negative numbers. An unknown number is a scam/spam call 99.9 of the time. Unless you're expecting a call from a number not on your contact list (ie, waiting for a call from a job application), don't answer the phone. To change your range, just change the number at the end of the expression. Hello, so I've been getting random calls from random phone numbers I don't recognize, around every 30-40 minutes they call on a new number. To summarize, the following code generates a random number between 0 and 13 inclusive with a uniform distribution: ABS(CHECKSUM(NewId())) % 14 Being 1-800 and 1-888 numbers, these aren't very credible, but if you think someone's easily fooled, give them a try. Internet The Best Prank Phone Numbers to Hand a Bad Date at the End of the Night By Tina Sieber Updated If you don't feel safe rejecting someone after a bad date, you can give them a prank phone number to make the situation a little more light-hearted. Take a look at SQL Server - Set based random numbers which has a very detailed explanation. 1-80 (finishing God Mode) 1-88 (Easter Egg) The caller will hear a recording by Kratos, a fictional character in the God of War video game series.
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