The error message you're seeing is related to the foreign key constraint you're trying to set up in your SHIPMENT table. The error ORA-02270 occurs when you're trying to reference a column that is not a unique or primary key in the referenced table.

Here's how you can fix this:

1. Check the BATCH table: Before creating the SHIPMENT table, you need to ensure that the BATCH table exists and that BATCH_ID is a primary key or a unique key in the BATCH table. You can check this by running the following command:

```sql
SELECT column_name, constraint_name, table_name
FROM all_cons_columns
WHERE table_name = 'BATCH';
```

2. Create/Alter BATCH table: If BATCH_ID is not a primary or unique key, you need to alter the BATCH table to make BATCH_ID a primary key or a unique key. Here's how you can do it:

```sql
ALTER TABLE BATCH
ADD CONSTRAINT batch_pk PRIMARY KEY (BATCH_ID);
```

3. Create SHIPMENT table: Now you can create the SHIPMENT table as you were trying to do before. The foreign key constraint should now work as expected.

Remember, the referenced column in the parent table (BATCH table in your case) must be a PRIMARY KEY or a UNIQUE Key. Otherwise, you cannot reference it in a child table (SHIPMENT table in your case).

Question

The error message you're seeing is related to the foreign key constraint you're trying to set up in your SHIPMENT table. The error ORA-02270 occurs when you're trying to reference a column that is not a unique or primary key in the referenced table.

Here's how you can fix this:

1. Check the BATCH table: Before creating the SHIPMENT table, you need to ensure that the BATCH table exists and that BATCH_ID is a primary key or a unique key in the BATCH table. You can check this by running the following command:

```sql
SELECT column_name, constraint_name, table_name
FROM all_cons_columns
WHERE table_name = 'BATCH';
```

2. Create/Alter BATCH table: If BATCH_ID is not a primary or unique key, you need to alter the BATCH table to make BATCH_ID a primary key or a unique key. Here's how you can do it:

```sql
ALTER TABLE BATCH
ADD CONSTRAINT batch_pk PRIMARY KEY (BATCH_ID);
```

3. Create SHIPMENT table: Now you can create the SHIPMENT table as you were trying to do before. The foreign key constraint should now work as expected.

Remember, the referenced column in the parent table (BATCH table in your case) must be a PRIMARY KEY or a UNIQUE Key. Otherwise, you cannot reference it in a child table (SHIPMENT table in your case).

Knowee AI · Accepted Answer

The error message you're seeing is related to the foreign key constraint you're trying to set up in your SHIPMENT table. The error ORA-02270 occurs when you're trying to reference a column that is not a unique or primary key in the referenced table.

Here's how you can fix this:

1. Check the BATCH table: Before creating the SHIPMENT table, you need to ensure that the BATCH table exists and that BATCH_ID is a primary key or a unique key in the BATCH table. You can check this by running the following command:

```sql
SELECT column_name, constraint_name, table_name
FROM all_cons_columns
WHERE table_name = 'BATCH';
```

2. Create/Alter BATCH table: If BATCH_ID is not a primary or unique key, you need to alter the BATCH table to make BATCH_ID a primary key or a unique key. Here's how you can do it:

```sql
ALTER TABLE BATCH
ADD CONSTRAINT batch_pk PRIMARY KEY (BATCH_ID);
```

3. Create SHIPMENT table: Now you can create the SHIPMENT table as you were trying to do before. The foreign key constraint should now work as expected.

Remember, the referenced column in the parent table (BATCH table in your case) must be a PRIMARY KEY or a UNIQUE Key. Otherwise, you cannot reference it in a child table (SHIPMENT table in your case).

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