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Additional info for Data and Databases. Concepts in Practice
This will cost me some extra storage, but I will get better search times because my little list will be so much smaller than the original table. That is the idea of an index! The most basic form of index consists of a file made up of the key column value(s) from all the base table’s rows and a pointer to the physical address where each row is located in the table. If you need a physical analogy for this method, look at the doorbell board in a large apartment building. The index is the list of names and apartment numbers (usually sorted on apartment numbers) and the doorbell button is the pointer that fetches the data (person) you sought.
1 Simple Indexes The simplest thing you can do to search a table is to just use the CREATE TABLE command and nothing else. In most SQL implementations, the rows will be stored in a file structure with a sequential access method of some kind. This saves the storage that would have been used for another access method, but will cost access time. SQL is not assumed to order the rows in a table, so every query to the table will have to do a complete linear search to be sure that it checked every row.
Folding: The digits of the input value are broken into subsets and then added to each other. This method is usually used with division or multiplication. 1 Uniform Hashing Function The reason that Sears and J. C. Penney use the last two digits of your telephone number as their hashing function is that if they filed orders by the last names, they would get too many collisions in the J and S pigeonholes and not fill up the Q and X pigeonholes. Telephone numbers tend to be uniformly distributed, unlike last names, which favor “Johnson” and “Smith” over “Quixby” and “Xavier” in English-speaking countries.