Very Computer

CREATE TABLE TESTE (COLUNA1 NUMERIC(2,0) PRIMARY KEY)

I insert one row in this table:

INSET INTO TESTE VALUES (1);

And now I want return this row with statement SELECT:

SELECT * FROM TESTE WHERE COLUNA1=10

Look this Explain plan:

SELECT * FROM TESTE WHERE COLUNA1=10

       |--Clustered Index
Scan(OBJECT:([MARTINI].[dbo].[TESTE].[PK__TESTE__5F9E293D]))

Why the explain plan use the function Convert?

And now I return this row with statement Select:

SELECT * FROM TESTE WHERE COLUNA1=10.

Look this Explain plain:

SELECT * FROM TESTE WHERE COLUNA1=10.
  |--Clustered Index
Seek(OBJECT:([MARTINI].[dbo].[TESTE].[PK__TESTE__5F9E293D]),

Why this occur???

Why the second Select is quicker than first????

Thank you for help!!