What is displayed when using the EXPLAIN command to analyze an SQL query?

The EXPLAIN command in SQL is used to analyze the execution plan of a query by the database management system. It shows how the DBMS intends to execute the query, including:

• The order of table processing
• The indexes used
• Types of joins
• Cost estimates of operations
• The number of rows expected to be processed at each step

This helps to understand how efficiently the query is written and where potential bottlenecks may occur.

Example of usage:

EXPLAIN SELECT * FROM users WHERE age > 30;

The result will show whether an index on the age field is used, how many rows are expected to be read, etc. This is important for query optimization and improving database performance.