…An index is a data structure that…optimizes searches, sequential access, insertions, and deletions.…Like many database systems MySQL uses indexes to improve…performance, and to support features that require ordered data.…An index keeps a logical order to a set of data.…This is a cornerstone of relational database technology.…If I want to find a particular row in a table, access to a fast…lookup of a unique index key is going to make that very easy to do.…
Internally, the data base organizes its indexes as B-trees.…Most data base indexes, including those used by My…SQL, use a form of B-tree to organize the data.…As an example of how this works, here's a…simple B-tree for looking up letters of an alphabet.…Without a B-tree, if I just had a list of letters and I wanted to find the letter u,…I would have to start at one end of…the list, compare the first letter to the letter u.…And then if it didn't match I would look at…the next letter and compare it to the letter u.…
And on and on until I find the letter I'm looking for.…
- Writing queries
- Creating and updating databases and tables
- Using MySQL built-in functions
- Sorting and filtering data
- Updating tables with triggers
- Working with subselects and views
- Creating and using a stored function
Skill Level Beginner
1. Installing and Configuring the Test Environment
2. Basic Syntax
3. Creating a Database
4. MySQL Data Types
5. MySQL Functions
8. Subselects and Views
9. Stored Routines
10. PHP's PDO Interface with MySQL
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