How to set foreign code in navicat

Setting foreign code in Navicat includes the following steps: Create a table. Create a foreign key field, check "Foreign Key" and select the reference table and field. Set update and deletion rules, usually select "cascade update" and "cascade delete". Click "OK" to save the settings and complete the foreign code creation.

How to set the foreign code in Navicat

It is very simple to set the foreign code in Navicat. The following are the detailed steps:

Step 1: Create Table

• Right-click on the database name and select "Create Table".
• Fill in the table name and fields in the "Table Wizard".

Step 2: Create a foreign code

• Right-click the field where you want to create a foreign code and select "Edit".
• In the "Edit Column" dialog box, check "Foreign Code".
• In the "Foreign Code" tab, select the reference table and reference field.

Step 3: Set update and delete rules

• Update rules: When the referenced field in the parent table changes, the corresponding field in the child table How to deal with foreign code fields. Normally select "Cascade Update".
• Deletion rules: When the referenced field in the parent table is deleted, how to deal with the corresponding foreign code field in the child table. Normally select "Cascade Delete".

Step 4: Complete

• Click "OK" to save the settings.
• Repeat the above steps to create foreign codes for other foreign code fields.

Example

Suppose you have two tables: Orders and Products. You want to create foreign keys to ensure that each order is associated with a product.

• In the Orders table, right-click the Product ID field and select Edit.
• In the "Edit Column" dialog box, check "Foreign Code".
• In the "Foreign Code" tab, set the reference table to "Product" and the reference field to "Product ID".
• Select "Cascade Update" and "Cascade Delete" as update and delete rules.
• Click "OK" to save the settings.

Now, whenever a product is updated or deleted in the Products table, all orders referencing that product in the Orders table will be updated or deleted accordingly.

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