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CREATE INDEX enables you to add indexes to existing tables. CREATE INDEX is mapped to an ALTER TABLE statement to create indexes. See Section 13.1.9, “ALTER TABLE Statement”. CREATE INDEX cannot be used to create a PRIMARY KEY; use ALTER TABLE instead. For more information about indexes, see Section 8.3.1, “How MySQL Uses Indexes”.
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;
To create a new index for a table, you use the CREATE INDEX statement as follows: CREATE INDEX index_name ON table_name(column1[,column2,...]); Code language: SQL (Structured Query Language) ( sql )
18 lut 2020 · In MySql, one can create an index on a (non-unique) column along with a table, e.g. create table orders( orderid varchar(20) not null unique, customerid varchar(20), index(customerid) ...
The CREATE INDEX statement is used to create indexes in tables. Indexes are used to retrieve data from the database more quickly than otherwise. The users cannot see the indexes, they are just used to speed up searches/queries.
10 sie 2017 · In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and how to see if it's useful. Skip to content
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