How to add unique constraints in navicat

Steps to add unique constraints in Navicat: Open the table designer and select the "Index/Unique" tab. Create a unique constraint and select the columns to constrain. Select the Unique checkbox and set additional index properties (optional). save Changes.

How to add unique constraints in Navicat

Navicat is a software for managing MySQL, MariaDB and PostgreSQL databases Tool of. To add a unique constraint in a table using Navicat, follow these steps:

1. Open the table designer

• Double-click the table name in the database to Open the table designer.

2. Select the Index/Unique tab

• In the top tab of the table designer, select the Index/Unique option Card.

3. Create a unique constraint

• In the "Index/Unique" tab, click the "Add Index/Unique" button.
• Enter the name of the unique constraint in the "Index Name" field.
• In the Columns section, select the column to which you want to add a unique constraint.

4. Set the unique constraint attribute

• Select the "Unique" check box to create a unique constraint.
• In the "Type" field, select the index type (for example: B-Tree, Hash).
• Configure other index properties as needed.

5. Save changes

• Click the Save button to apply the changes.

Example:

Suppose there is a table named "users" that contains the columns "id", "name" and "email". To add a unique constraint for the "email" column, perform the following steps:

1. Open the table designer for the "users" table.
2. Select the "Index/Unique" tab.
3. Create a unique constraint named "unique_email".
4. In the "Columns" section, select the "email" column.
5. Select the "Only" checkbox.
6. Click the "Save" button.

Now, the "email" column in the "users" table will be marked as a unique constraint, ensuring that there are no duplicate email addresses in the table.

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