How to set unique attributes when creating a table in Navicat

How to set unique attributes in Navicat

Step 1: Create a table

1. Open Navicat and connect to the database.
2. Right-click the Schemas or Databases node and select New Table.
3. Enter the table name in the "Table Name" field.

Step 2: Define the fields

1. Enter the field name in the "Field Name" column.
2. Select the data type of the field in the "Data Type" column.
3. In the "Properties" column, check the "Unique" checkbox to set the field's unique properties.

Step Three: Set Unique Constraints

In addition to setting the unique properties of fields, you can also create unique constraints to ensure the combined values ​​of multiple fields only.

1. Right-click the table and select Edit Table or Design View.
2. In the Constraints tab, click the Add Constraint button.
3. Select "Unique" in the "Constraint Type" drop-down menu.
4. Select the field you want to force unique in the Field list.

Other options

• Index: You can also create indexes to improve query performance for unique constraints.
• Primary key: The primary key is a special unique constraint that uniquely identifies each record in the table.
• Unique key: Unique key is another unique constraint, but it does not enforce the restrictions of the primary key.

Note:

• Unique constraints and indexes are two common ways to achieve uniqueness in a database.
• Unique constraints enforce uniqueness during update and insert operations, while indexes are only used to increase query speed.

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