Syntax and an example for create, rename and delete index.
Create Index:CREATE INDEX index_name ON table_name (col_1,col_2..);
Example:Create index index_sample ON employee(emp_id)
Rename Index:ALTER INDEX index_name RENAME to new_index_name ;
Example:ALTER INDEX index_sample RENAME to new_sample
Delete index:drop index [schema.]index [force];
Example:Drop index new_sample