Complete Guide to Database Indexing

Database indexes are crucial for query performance. Here's what you need to know:

Creating an Index

[sql] CREATE INDEX idx_email ON users(email); [/sql]

Composite Index

[sql] CREATE INDEX idx_name_age ON users(last_name, first_name, age); [/sql]

Unique Index

[sql] CREATE UNIQUE INDEX idx_username ON users(username); [/sql]