Question

What is Referential integrity in MySQL dont spam please I got board exam

Answer 1

Heya friend!

Here is the answer for your question!

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Question:

‣What is Referential integrity in MySQL

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Answer:

‣ Referential Integrity is a rule in MySql which ensures that the relations between Database Management system and it's records in related tables are valid.

‣ It prevents the user from accidentally deleting any data from the tables in the database

‣ It also reffers to the accuracy and consistency of data in a relationship between records & DBMS

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Hope this answer has helped you !

Answer 2

Answer:

Referential integrity is an important concept in database design. The term refers to a state when all the references in a database are valid and no invalid links exist between the various tables that make up the system. When referential integrity exists, any attempt to link to a record which does not already exist will fail; this helps prevent user errors, producing a more accurate (and useful) database.

Explanation:

Referential integrity is usually implemented through the use of foreign keys. For a long time, the popular open-source RDBMS MySQL did not support foreign keys, citing concerns that such support would erode RDBMS speed and performance. However, given the high volume of user interest in this feature, recent versions of MySQL have implemented support for foreign keys through the new InnoDB table engine. Consequently, maintaining referential integrity within the tables that make up a database has become significantly simpler.

In order to set up a foreign key relationship between two MySQL tables, three conditions must be met:

1. Both tables must be of the InnoDB table type.
2. The fields used in the foreign key relationship must be indexed.
3. The fields used in the foreign key relationship must be similar in data type.