The PRIMARY KEY Clause : Primary Key « Constraints « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Constraints » Primary Key 
7.2.2.The PRIMARY KEY Clause
The PRIMARY KEY clause has the following form:

      [CONSTRAINT c_name]
      PRIMARY KEY [CLUSTERED | NONCLUSTERED] (col_name1 [{,col_name2...])


11>
12CREATE TABLE employee (emp_no INTEGER NOT NULL,
13>               emp_fname CHAR(20NOT NULL,
14>               emp_lname CHAR(20NOT NULL,
15>               dept_no CHAR(4NULL,
16>       CONSTRAINT prim_empl PRIMARY KEY (emp_no))
17>
18> drop table employee;
19> GO
1>
7.2.Primary Key
7.2.1.Primary Key Constraint
7.2.2.The PRIMARY KEY Clause
7.2.3.Define constraint name for primary key
7.2.4.PRIMARY KEY (cust_id)
7.2.5.You cannot add another primary key to table
7.2.6.NONCLUSTERED PRIMARY KEY
7.2.7.Using a Multicolumn Primary Key
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