How To Write Multivalued Attribute in Sql

In SQL, a multivalued attribute can be represented using a separate table that is linked to the main table through a foreign key. Here is an example of how to write a multivalued attribute in SQL:

1. Create the main table:

   sql
   CREATE TABLE main_table (
   id INT PRIMARY KEY,
   attribute1 VARCHAR(50),
   attribute2 VARCHAR(50),
   -- other attributes
   );
   

2. Create the multivalued attribute table:

   sql
   CREATE TABLE multivalued_table (
   main_table_id INT,
   attribute_value VARCHAR(50),
   FOREIGN KEY (main_table_id) REFERENCES main_table(id)
   );
   

3. Insert data into the main table:

   sql
   INSERT INTO main_table (id, attribute1, attribute2) VALUES (1, 'value1', 'value2');
   

4. Insert data into the multivalued attribute table:

   sql
   INSERT INTO multivalued_table (main_table_id, attribute_value) VALUES (1, 'value3');
   INSERT INTO multivalued_table (main_table_id, attribute_value) VALUES (1, 'value4');
   

5. Retrieve data from the main table with multivalued attribute:

   sql
   SELECT * FROM main_table WHERE id = 1;
   

   This will give you the main table row with the corresponding multivalued attribute values.

6. Retrieve data from the multivalued attribute table:

   sql
   SELECT attribute_value FROM multivalued_table WHERE main_table_id = 1;
   

   This will give you all the attribute values associated with the main table row.

Note: It is important to properly manage the foreign key constraint and ensure data integrity when working with multivalued attributes in SQL.

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