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Use the Primary key dialog to create or modify a primary key constraint. A primary key constraint indicates that a column, or group of columns, uniquely identifies rows in a table. This requires that the values in the selected column(s) be both unique and not null.
The Primary key dialog organizes the development of a primary key constraint through the General and Definition tabs. The SQL tab displays the SQL code generated by dialog selections.
Use the fields in the General tab to identify the primary key:
Click the Definition tab to continue.
Use the fields in the Definition tab to define the primary key constraint:
Click the SQL tab to continue.
Your entries in the Primary key dialog generate a SQL command (see an example below). Use the SQL tab for review; revisit or switch tabs to make any changes to the SQL command.
The following is an example of the sql command generated by user selections in the Primary key dialog:
The example shown demonstrates creating a primary key constraint named dept_pkey on the dept_id column of the dept table.