How to set foreign keys in navicat

Setting up foreign keys in Navicat requires: creating foreign key tables and relationships; configuring foreign key constraints, including parent tables, foreign key fields, update cascades and delete cascades; saving changes and viewing foreign keys.

Setting foreign keys in Navicat

To set foreign keys in Navicat, you need to follow the following steps:

1. Create a foreign key table

• Create a table in the database and specify the primary key.
• Create a second table, called the subtable, which will contain the foreign keys.

2. Create a relationship

• Right-click the subtable and select "Design".
• In the "Fields" tab, select the field where you want to create a foreign key.
• Select "Foreign Key" from the "Data Type" drop-down menu.

3. Configure foreign key constraints

• In the "Foreign Key Constraints" tab, enter the parent table name and foreign key field.
• Select "Reference Primary Key" to specify the parent table primary key.
• Select Update Cascade and/or Delete Cascade to define the behavior of the foreign key constraint.

4. Save changes

• Click "OK" to save the changes.

5. View foreign keys

• Right-click the subtable and select "Design".
• In the "Foreign Keys" tab, you can see the created foreign keys.

6. Foreign key behavior

• Update cascade:When a record in the parent table is updated, the child table Foreign keys that reference the record in will be updated automatically.
• Delete cascade: When a record in the parent table is deleted, the foreign key referencing the record in the child table will be automatically deleted.

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