How does SQLite indexing work?

What is indexed in SQLite?

Advertisements. 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.

Are primary keys automatically indexed SQLite?

An INTEGER PRIMARY KEY becomes the actual key used in the B-tree that stores your table. So no index is required for efficient operation. You should always omit indexes on PRIMARY KEY columns, regardless of the type. The best case for an index on a PRIMARY KEY is that it will be a no-op.

How do I index a table in SQLite?

SQLite Create and Drop Index1Syntax: CREATE [UNIQUE] INDEX index_name ON table_name ( column_name [, ...] );2Parameters: index_name - Name of the index. ... 3Create Index:4Creating an Index on a Column. Here we are creating a table company. ... 5Create Index on Multiple Columns. ... 6Create UNIQUE Index. ... 7Collation. ... 8Drop Index.SQLite Create and Drop Index - w3resource

When should indexes be avoided SQLite?

Indexes should not be used on columns that return a high percentage of data rows when used as a filter condition in a query's WHERE clause. For instance, you would not have an entry for the word "the" or "and" in the index of a book.