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Learn how to create indexes in MySQL tables to speed up data retrieval. See the syntax, examples and differences between CREATE INDEX and CREATE UNIQUE INDEX statements.
You can use this syntax to add an index and control the kind of index (HASH or BTREE). create index your_index_name on your_table_name(your_column_name) using HASH; or. create index your_index_name on your_table_name(your_column_name) using BTREE;
Learn how to create indexes on existing tables with CREATE INDEX, including column prefixes, functional key parts, unique indexes, full-text indexes, multi-valued indexes, and spatial indexes. See syntax, options, and examples for different types of indexes.
Learn how MySQL uses indexes to find rows with specific column values quickly and efficiently. See examples of index usage for WHERE, JOIN, ORDER BY, GROUP BY, and MIN() or MAX() operations.
Creating and Managing MySQL indexes. This section explains what an index is and shows you how to create, modify, and drop an index. Creating indexes – introduce the index concept and show you how to create an index for one or more columns of a table.
To create an index for a column or a list of columns, you specify the index name, the table to which the index belongs, and the column list. For example, to add a new index for the column c4, you use the following statement:
27 cze 2024 · If you want to add an index to an existing table, you can use the CREATE INDEX statement. The syntax for adding an index is: CREATE INDEX index_name ON table_name (column_names); index_name: The name of the index. table_name: The name of the table to which the index belongs. column_names: The list of columns to be indexed.
