Question

A seperate CONSTRAINT line is not required when defining a tables primary key? True or false ?? (SQL SERVER)

Answer 1

This seems true to me. In my mind, something like this is totally valid:

CREATE TABLE user
(Email VARCHAR(20) NOT NULL,
Name VARCHAR(20) NOT NULL,
Password VARCHAR(20) NOT NULL,
Primary Key (Email));

'Constraint' would be optional.

Answer 2

Further clarification:

the 'Constraint' keyword is optional only if you want to refer to that constraint value by name later. If not, then sql will generate a name for your constraint. This is useful when there are many constraints and you want to modify them individually by name.

had I wanted to name the constraint, I could have written that line as:
...
Constraint userKey Primary Key (Email));