How to create foreign keys in navicat

The steps to create a foreign key in Navicat are as follows: Create a parent table and a child table. Select the subtable and open the table designer. Add new columns and set column properties. Set foreign key constraints in the foreign key section. save Changes.

Steps to create foreign keys in Navicat

The process of creating foreign keys in Navicat is divided into the following steps:

1. Create parent table and child table

Creating a foreign key requires two tables: parent table and child table. The parent table is the table that contains primary keys, while the child table is the table that contains foreign keys.

2. Select the subtable and open the table designer

In Navicat's "Database" pane, select the subtable and right-click. In the pop-up menu, select "Design Table".

3. Add a new column

In the "Table Designer" window, find the "Columns" section and click the "Add Column" button.

4. Set column properties

• Column name:Enter the name of the foreign key column.
• Data type: Select the same data type as the primary key of the parent table.
• Whether NULL is allowed: Check this box if foreign key values ​​are allowed to be null.

5. Set foreign key constraints

In the "Column Properties" tab, find the "Foreign Keys" section.

• Foreign key name: Enter the name of the foreign key constraint.
• Reference table: Select the parent table.
• Reference column: Select the primary key column of the parent table.

6. Save changes

Click the Save button to save the changes.

Example:

Suppose we have a parent table named Orders which contains the OrderID primary key and CustomerID column. We also want to create a subtable named Customers that contains the CustomerID foreign key.

Steps to create foreign keys:

1. Create the Orders and Customers tables.
2. Select the Customers table and open the table designer.
3. Add a column named CustomerID, the data type is int, and allows to be empty.

4. In the "Foreign Key" section, configure the following:

   • Foreign key name: FK_Customers_OrderID
   • Reference table: Orders
   • Reference Column: OrderID
5. Save changes.

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