How to write foreign keys in navicat

In Navicat, the steps to create a foreign key are as follows: Open and connect to the database. Select the table to create the foreign key. Switch to design view. Right-click on the column where you want to create the foreign key and select Edit Column. Specify foreign key information: reference table, reference column, update cascade, and delete cascade. save Changes.

Creating foreign keys in Navicat

Creating foreign keys in Navicat is very simple, just follow the steps below That’s it:

Step 1: Open Navicat

Start Navicat and connect to the target database.

Step 2: Select the table

Select the table to create a foreign key in the left navigation bar.

Step 3: Switch to Design View

Click the "Design" tab in the top menu bar to switch the table to Design View.

Step 4: Add a foreign key column

In the table designer, find the column for which you want to create a foreign key. Right-click the column and select Edit Column. In the Edit Column dialog box, select the Foreign Keys tab.

Step 5: Specify foreign key information

In the "Foreign Key" tab, you can specify the following information:

• Reference table: Select the table referenced by the foreign key column.
• Reference column: Select the column referenced by the foreign key column.
• Update cascade: If the data in the reference table changes, whether to cascade update the foreign key column.
• Delete cascade: If the data in the reference table is deleted, whether to cascade delete foreign key rows.

Step 6: Save changes

After filling in the foreign key information, click the "OK" button to save the changes.

Example:

Suppose we want to create a foreign key in the "Orders" table, referencing the "Customer ID" column in the "Customer" table:

1. In Navicat, open the "Orders" table.
2. Switch to design view.
3. Right-click the Customer ID column and select Edit Column.
4. In the "Foreign Keys" tab, select the "Customer" table and the "Customer ID" column.
5. Click "OK" to save changes.

In this way, a foreign key is successfully created in the "Orders" table, referencing the "Customer ID" column in the "Customer" table.

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