How to create table foreign key in navicat

To create a table foreign key in Navicat, follow the following steps: Create the main table and define columns. Create a foreign key table and define columns. Create a foreign key in the foreign key table, selecting the primary table and the foreign key reference column. (Optional) Enable foreign key constraints to ensure data consistency.

How to create a table foreign key in Navicat

The process of creating a table foreign key in Navicat is as follows:

Step one: Create the main table

1. Open the database for which you want to create a foreign key in Navicat.
2. Right-click the database name and select New >Table.
3. Enter the name and column definition of the main table.

Step 2: Create a foreign key table

1. Repeat step 2 to create a new table for the table for which you want to create a foreign key.
2. Enter the name and column definition of the foreign key table.

Step 3: Create a foreign key

1. In the foreign key table, right-click the column where you want to create a foreign key and select "Modify" ".
2. In the Modify Column dialog box, go to the Other tab.
3. In the "Foreign Keys" section, check "Reference Foreign Keys".
4. Select the main table from the Table drop-down menu.
5. Select the foreign key reference column in the main table from the Column drop-down menu.
6. Click OK to save changes.

Step 4: Enforce foreign key constraints (optional)

1. Right-click the foreign key table and select "Table Properties".
2. Go to the Constraints tab.
3. Select the "Enable foreign key constraints" checkbox.
4. Click OK to save changes.

Note:

• The data type of the foreign key column must be the same as the data type of the foreign key reference column in the referenced main table or compatible.
• Foreign key columns cannot contain null values.
• Foreign key constraints ensure that the data in the foreign key table is consistent with the data in the main table.

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