Just to spell it out - the Result of Pinal Dave's example are indexes similar to the following:
TestTable PK__TestTabl__3214EC2703317E3D CLUSTERED
TestTable UQ__TestTabl__A259EE55060DEAE8 NONCLUSTERED
Which can be explained as follows:
PK Clustered
If a table is created with a primary key, then it is a Clustered Table, and the Clustered Index is defaulted to the Primary Key unless you specify otherwise.
(Tables without a Clustered Index are Heaps)
UQ Nonclustered
SQL does not usually create any non-clustered indexes on a table by default.
However, as Marc has pointed out, because the table has a column with a UNIQUE
constraint, (Col1 INT NOT NULL UNIQUE)
, MS SQL implements the constraint as a unique, non-clustered index on that column.
See also: Is the Sql Server Unique Key also an Index?