Check out example codes for "show indexes mysql". It will help you in understanding the concepts better.

Code Example 1

SHOW INDEX FROM yourtable;

Code Example 2

SHOW INDEXES FROM table_name;

Code Example 3

SELECT
    tablename,
    indexname,
    indexdef
FROM
    pg_indexes
WHERE
    schemaname = 'yourschema' and tablename='yourtable'
ORDER BY
    tablename,
    indexname;
(POSTRGRESQL)

Learn ReactJs, React Native from akashmittal.com