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# Table Wizard - Set Primary Key

Specifies a field in the table to be used as a primary key.

## Create a primary key

Select to create a primary key. Add a primary key to every database table to uniquely identify each record. For some database systems within LibreOffice, a primary key is mandatory for editing the tables.

### Automatically add a primary key

Select to automatically add a primary key as an additional field.

### Use an existing field as a primary key

Select to use an existing field with unique values as a primary key.

#### Field name

Select the field name.

#### Auto value

Select to automatically insert a value and increment the field's value for each new record. The database must support automatic incrementation in order to use the Auto value feature.

### Define primary key by several fields

Select to create a primary key from a combination of several existing fields.

#### Available fields

Select a field and click > to add it to the list of primary key fields.

### >

Click to move the selected field(s) to the box that the arrow is pointing to.

### <

Click to move the selected field(s) to the box that the arrow is pointing to.

#### Primary key fields

Select a field and click < to remove it from the list of primary key fields. The primary key is created as a concatenation of the fields in this list, from top to bottom.

Table Wizard - Create table

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