What is index key in phpMyAdmin?

An index is a data structure that allows for rapid access to a few rows in a table, based on a description of the columns of the table that are indexed. The index consists of copies of certain table columns, called index keys, interspersed with pointers to the table rows.

Which key is automatically indexed?

Yes, primary key is automatically indexed in MySQL because primary key, index, etc gets stored into B-trees. All engines including InnoDB as well as MyISAM automatically supports the primary key to be indexed. The primary key is implicitly indexed in InnoDB, MyISAM, and other engines.

How do I set primary key in phpMyAdmin?

Adding a Primary Key to a New Table In phpMyAdmin. When creating a new table in phpMyAdmin, select PRIMARY from the Index dropdown on the column that will be the primary key. Check the box in the A_I column if this will be an auto incrementing key.

Is a primary key automatically an index?

A primary index is automatically created for the primary key and ensures that the primary key is unique. You can use the primary index to retrieve and access objects from the database. The unique index is a column, or an ordered collection of columns, for which each value identifies a unique row.

What is index name in MySQL?

The index name is used to reference the index for future commands. Like drop index. http://dev.mysql.com/doc/refman/5.0/en/drop-index.html. Just think of index names like table names. You can just as easily make a table called ‘blah’.

What is index in table?

Indexes are special lookup tables that the database search engine can use to speed up data retrieval. Simply put, an index is a pointer to data in a table. An index in a database is very similar to an index in the back of a book.

Does MySQL automatically index?

Yes, Innodb provide this. You can put a foreign key name after FOREIGN KEY clause or leave it to let MySQL to create a name for you. MySQL automatically creates an index with the foreign_key_name name.

Does primary key CREATE INDEX in MySQL?

Even though PRIMARY wasn’t specified, MySQL automatically created an index for the primary key. Note: An index cannot be used to create a primary key. However, when a table is created with a primary key, MySQL creates an index called PRIMARY for the primary key values in that same table.

How do I find my foreign key in phpMyAdmin?

To see FKs of a table first select table from the object explorer, then go to Structure tab and then select Relation view. Please note that in different versions it might be in different locations. On the Relation view screen you will see all foreign keys defined for this table (as a foreign table).

Does primary key create index in MySQL?

Should primary key be indexed?

A primary key is unique, whereas an index does not have to be unique. Therefore, the value of the primary key identifies a record in a table, the value of the index not necessarily. Primary keys usually are automatically indexed – if you create a primary key, no need to create an index on the same column(s).