After reading a recent article on identifying islands and gaps in sequential numbers, one of our readers was inspired to develop a more efficient solution for fragmented data. New Author Goce Smilevski brings us his solution and supporting data to show how this can be done better.
2021-04-16 (first published: 2004-11-22)
11,386 reads
It is often necessary to generate a table with sequential numbers, up to a specified upper limit N. For small N, a simple INSERT in a WHILE loop will do. But, for large N, that solution becomes too slow. This script presents a different approach. It generates sequential numbers from the binary representation of N, […]
2004-12-30 (first published: 2003-11-24)
651 reads
This a modification to the script given by Preethi.It generates prime numbers to the upper bound you specify.Modifications are using following facts from algebra:1. All prime numbers greater than 3 can be written in the form 6 * X +/- 1.2. Instead of checking the module for ALL numbers
2003-09-25
414 reads
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There is a table tmp_tab:
CREATE TABLE tmp_tab ( id int, val int );
INSERT INTO tmp_tab VALUES (1, 1), (2, NULL), (3, 3), (4, 4), (5, 5);You want to order the rows ids by the following expression:
ISNULL(val, id) + 1Which of the following queries produces the expected ordering and why? (Select all correct) See possible answers