¿Cómo puedo obtener datos de otra tabla usando una clave externa en SQL?

How can I get data from another table using foreign key in SQL?

To retrieve data from both table associated with foreign key i.e(common column) you have to join both the tables. if you matching data from both table then use INNER JOIN.

In this example we are going to show you how to insert data in database using laravel framework PHP….Create 3 files for insert data in Laravel :

1. StudInsertController. php (app/Http/Controllers/StudInsertController. php)
2. stud_create. php (resources/views/stud_create. php)
3. web. php (routes/web. php)

If you want to join two or multiple tables in laravel then you can use laravel eloquent join (), left join (), right join (), cross join (). And another option to join two or multiple table, you can use laravel eloquent relationships instead of laravel join.

When you dump the above-given laravel right join with multiple conditions query, you will get the following SQL query: The CROSS JOIN joined every row from the first table (T1) with every row from the second table (T2). If you would like to use a “where” style clause on your joins, you may use the where and orWhere methods on a join.

And another option to join two or multiple table, you can use laravel eloquent relationships instead of laravel join. Laravel JOIN eloquent returns all rows from the both table, if there are matches in the both table. Otherwise, the result is NULL.

Suppose the relation between your Product and Sku models model is: To fetch the products data along with the sku data you can use the with method. In your controller: For the repository question: if you want to use a repository you can place the eloquent-access part of your code inside the repository.

You can use information_schema tables like this:

1. SELECT.
2. tc.table_schema,
3. tc.constraint_name,
4. tc.table_name,
5. kcu.column_name,
6. ccu.table_schema AS foreign_table_schema,
7. ccu.table_name AS foreign_table_name,
8. ccu.column_name AS foreign_column_name.

Define Foreign Key Using ALTER TABLE Statement

1. ALTER TABLE table_name.
2. ADD [CONSTRAINT [symbol]] FOREIGN KEY.
3. [index_name] (column_name.)
4. REFERENCES table_name (column_name,…)
5. ON DELETE referenceOption.
6. ON UPDATE referenceOption.

In this syntax:

1. First, specify the name for the foreign key constraint after the CONSTRAINT keyword.
2. Second, specify one or more foreign key columns in parentheses after the FOREIGN KEY keywords.
3. Third, specify the parent table and parent key columns referenced by the foreign key columns in the REFERENCES clause.

To drop foreign keys using the Control Center:

1. Expand the object tree until you see the Tables folder.
2. Right-click the table you want to modify, and select Alter from the pop-up menu.
3. On the Keys page, click Add.
4. Select the foreign keys at right to drop.

So, let’s assume you have a table definition like this: CREATE TABLE vehicles (`id_car` int, `car_model` varchar(2), `car_owner` int); CREATE TABLE users (`user_id` int, `user_name` varchar(5), `user_phone` varchar(7) , CONSTRAINT `fk_your_foreign_key` FOREIGN KEY (user_id) REFERENCES vehicles(car_owner) );

A foreign key is an attribute of a relation that is a primary key of another relation. d. A foreign key is the primary key of a relation that does not occur anywhere else in the schema.

While fetching data from dbcontext this.dbcontext.JobDetails.GetAll (). Here I also need data from a foreign key table that is likes for current jobDetails. To expand on the answer provided, you can also get several lists and even nested data.

For getting the result from the two table associated with the foreign key, you need to join the tables. You need to join these tables to get the result that you want. This query will return everything from Table B and name from Table A where the ID from Table B is the same as the ID from Table A.

Finally, if you need everything from both tables, matching or not, you can use FULL JOIN. For getting the result from the two table associated with the foreign key, you need to join the tables. You need to join these tables to get the result that you want.

The FK_indexes column shows the names of any indexes on the foreign-key table that could potentially be used to satisfy seeks using the foreign-key columns (mainly for optimizing deletes or updates to the primary key table). If it’s NULL, then you’ve got an unindexed foreign key.