Is having a field in primary key constraint optimizes sorting of the table ?
Here's the schema of the table:
CREATE TABLE Persons ( Field1 long NOT NULL, Field2 long NOT NULL, Field3 long NOT NULL, Field4 long NOT NULL, Filed5 long NOT NULL, CONSTRAINT PK_Person PRIMARY KEY (Field1 Asc,Field2 Asc,Field3 Asc,Field4 Asc));
The sorting query:
Select * from Persons order by Field4
field4 in primary key constraint doesn't provide any uniqueness with respect to values.
The only reason it's added is to optimize the sorting on
field4, since sorting on a column that does have an clustered index helps in optimization.
In short, Is having the
field4 in primary key constraint helping with the optimization of the above sorting query, even though the primary key constraint is created using ascending order of
field3 and the