How to set unique attributes in Navicat
Step 1: Create a table
- Open Navicat and connect to the database.
- Right-click the Schemas or Databases node and select New Table.
- Enter the table name in the "Table Name" field.
Step 2: Define the fields
- Enter the field name in the "Field Name" column.
- Select the data type of the field in the "Data Type" column.
- 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.
- Right-click the table and select Edit Table or Design View.
- In the Constraints tab, click the Add Constraint button.
- Select "Unique" in the "Constraint Type" drop-down menu.
- 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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