The document discusses the Normal Forms 3NF and BCNF. It defines 3NF as removing columns that are not dependent on the primary key. BCNF is defined as requiring that every determinant must be a candidate key. An example shows a relation transformed into BCNF by removing a violating functional dependency and creating two new relations.
The normal forms (NF) of relational database theory provide criteria for determining a table’s degree of vulnerability to logical inconsistencies and anomalies.
The normal forms (NF) of relational database theory provide criteria for determining a table’s degree of vulnerability to logical inconsistencies and anomalies.
Database normalization is the process of refining the data in accordance with a series of normal forms. This is done to reduce data redundancy and improve data integrity. This process divides large tables into small tables and links them using relationships.
Here is the link of full article: https://www.support.dbagenesis.com/post/database-normalization
Normalization is the process of organizing data in a database. This includes creating tables and establishing relationships between those tables according to rules designed both to protect the data and to make the database more flexible by eliminating redundancy and inconsistent dependency.
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Database normalization is the process of refining the data in accordance with a series of normal forms. This is done to reduce data redundancy and improve data integrity. This process divides large tables into small tables and links them using relationships.
Here is the link of full article: https://www.support.dbagenesis.com/post/database-normalization
Normalization is the process of organizing data in a database. This includes creating tables and establishing relationships between those tables according to rules designed both to protect the data and to make the database more flexible by eliminating redundancy and inconsistent dependency.
Find what is the MVP (Minimum Viable Product) and how to create an MVP.
This slide was created for my "MVP workshop" at TrigUp's Pre-Accelerating Program.
An introduction to database Normalization. An essential part of logical database design for relational databases. The presentation also has little coverage of related concepts like functional dependency, data anomalies, dependency preservation and lossless decomposition.
Normalization is the process of reorganizing data in a database so that it meets two basic requirements:
(1) There is no redundancy of data (all data is stored in only one place),
(2) data dependencies are logical (all related data items are stored together).
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12. So putting things together The above relation is now in 2NF since the relation has no non-key attributes. Supplier Address Cost Supplier Description Inventory Cost Supplier Description Inventory Supplier Address Name Supplier
13. 3) Remove columns that are not dependent upon the primary key. So for every nontrivial functional dependency X --> A, (1) X is a superkey, or (2) A is a prime (key) attribute.
14.
15.
16. The table in 3NF 300 P1 Jones S2 200 P2 Yues S1 250 P3 Yues S2 100 P1 Yues S1 QTY PART# SNAME SUPP#
20. Third Normal Form: Each column must depend on *directly* on the primary key.
21. Boyce-Codd Normal Form (BCNF) Boyce-Codd normal form (BCNF) A relation is in BCNF, if and only if, every determinant is a candidate key. The difference between 3NF and BCNF is that for a functional dependency A B, 3NF allows this dependency in a relation if B is a primary-key attribute and A is not a candidate key, whereas BCNF insists that for this dependency to remain in a relation, A must be a candidate key.
22.
23. Example of BCNF(2) To transform the ClientInterview relation to BCNF, we must remove the violating functional dependency by creating two new relations called Interview and StaffRoom as shown below, Interview ( clientNo , interviewDate , interviewTime, staffNo) StaffRoom( staffNo , interviewDate, roomNo) Interview StaffRoom BCNF Interview and StaffRoom relations SG5 SG37 SG5 SG5 staffNo 10.30 1-Jul-02 CR56 12.00 13-May-02 CR74 10.30 13-May-02 CR76 12.00 13-May-02 CR76 interviewTime interviewDate ClientNo SG5 SG37 SG5 staffNo G102 1-Jul-02 G102 13-May-02 G101 13-May-02 roomNo interviewDate
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