Is primary key default index?

Is primary key indexed by default Postgres?

PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness. Thus, it is not necessary to create an index explicitly for primary key columns.

Is primary key indexed by default in Oracle?

Primary keys are indexed. Oracle Database enforces a UNIQUE key or PRIMARY KEY integrity constraint on a table by creating a unique index on the unique key or primary key. This index is automatically created by the database when the constraint is enabled.

What is the default index?

Default Homepage The index. html page is the most common name used for the default page shown on a website if no other page is specified when a visitor requests the site. In other words, index. html is the name used for the homepage of the website.