Answer Posted / j geor

Database normalization is a technique for designing
relational database tables to minimize duplication of
information and, in so doing, to safeguard the database
against certain types of logical or structural problems,
namely data anomalies.
1NF Eliminate Repeating Groups - Make a separate table for
each set of related attributes, and give each table a
primary key.
2NF Eliminate Redundant Data - If an attribute depends on
only part of a multi-valued key, remove it to a separate table.
3NF Eliminate Columns Not Dependent On Key - If attributes
do not contribute to a description of the key, remove them
to a separate table.
BCNF Boyce-Codd Normal Form - If there are non-trivial
dependencies between candidate key attributes, separate them
out into distinct tables.
4NF Isolate Independent Multiple Relationships - No table
may contain two or more 1:n or n:m relationships that are
not directly related.
5NF Isolate Semantically Related Multiple Relationships -
There may be practical constrains on information that
justify separating logically related many-to-many relationships.
ONF Optimal Normal Form - a model limited to only simple
(elemental) facts, as expressed in Object Role Model notation.
DKNF Domain-Key Normal Form - a model free from all
modification anomalies.

What is full join in sql?

752

---

How sql query is executed?

849

---

What is pragma in pl sql?

803

---

what is sub-query? : Transact sql

887

---

Can we call a function containing dml statements in a select query?

768

---

What are the different types of dbmss?

781

---

Explain the rollback statement?

813

---

How many sectors are in a partition?

788

---

Is merge a dml statement?

762

---

What are the types of keys?

715

---

What is foreign key and example?

741

---

How can you save or place your msg in a table?

760

---

What is a trigger word?

777

---

Explain the update statement in sql

768

---

how to create a test table in your mysql server? : Sql dba

736

---