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What is the purpose of MySQL index?
Indexes speed up data searches and help retrieve specific information quickly.
What is a MySQL index?
A data structure that improves the speed of data retrieval operations on a database table.
Which of the following is NOT a type of MySQL index?
What must a primary index contain?
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What does a unique index ensure?
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What is the function of a composite index?
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Which MySQL index is designed for geographic data types?
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The command to create a new index is CREATE INDEX ______ ON table_name.
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What clause is associated with Full-Text Indexes in SQL?
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A descending index is available in MySQL versions prior to 8.0.
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Study Notes
Purpose of MySQL Index
- MySQL Indexes are designed to increase the speed and efficiency of data retrieval operations within a database.
- Indexes allow the database to quickly find and retrieve data without scanning the entire table.
- Strategic implementation of indexes can execute high-performance database queries, rendering faster and a more responsive application.
What is MySQL Index
- A data structure to improve the speed of data retrieval operations on a database table.
- Similar to an index in a book, it helps find specific information quickly without reading the whole book.
- Allows the database to locate and access table rows much faster than without an index.
Types of MySQL Indexes
- Simplex Index: Basic type of index where values inserted into the indexed column are easily searched. Duplicate values or NULL values are allowed.
- Primary Index: Must contain unique values and values must not be null. Can be set to a single column or multiple columns in a database. Examples: Employee Number, SSS No.
- Unique Index: Does not allow duplicate values to be inserted into the indexed column. Can be added to single or multiple columns. If added to a single column, values must be unique. If added to multiple columns, the combination of values in those columns must be unique. Examples: Product Number, product code, airwaybill, packing number
- Full-Text Index: Comes with full-text indexes with MATCH and AGAINST clause in SQL queries, find in search engines. Example: Product Description, Articles
- Descending Index: Only available in MySQL versions after 8.0. Index is used to store data in a reverse order. Useful for searching the latest values inserted into the database table
- Composite Index: An index created on more than one column. Improves performance in queries that filter on more than one column, prioritizing the first column used in the query. Example: A composite index on (last_name, first_name) would be helpful if always searching by last and first name.
- Spatial Index: Applied to geographic data types, enabling efficient management and querying of spatial data. Useful in applications that involve mapping, location-based services, and geographic information systems.
Creating INDEXEX on New Table
- Syntax: CREATE TABLE (column1 datatype PRIMARY KEY, column1 datatype PRIMARY KEY, column1 datatype PRIMARY KEY, …….INDEX (column_name));
Creating INDEXEX on Existing Table
- Create index on existing table with the following SQL statements:
- With CREATE INDEX statement
- With ALTER command
- Basic syntax of the CREATE INDEX statement: CREATE INDEX name_INDEX ON table_name;
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Description
This quiz explores the purpose, types, and functionality of MySQL indexes in enhancing database performance. Learn about simplex and primary indexes, and how they optimize data retrieval operations. Test your knowledge on efficient database querying techniques.
