Put the answer if you are 100% sure of the answer, otherwise no  To transform a relation from 1st NF to 2nd NF we must remove which of the following?   All partial-key dependencies   All inverse partial-key dependencies   All repeating groups   All transitive dependencies         Al the following are integrity constraints, EXCEPT:   Primary Key   Distinct   Unique   Check   How many cases there are for creating a DB trigger based on the time and the event of the Trigger ?   Three Cases   Four Cases   Five Cases   Six Cases

Q: What are three indications that a surrogate key should be constructed for the primary key of a…

A: Surrogate key is unique key and also called as synthetic primary key. Surrogate key holds anonymous…

Q: Consider the relation schema R (A, B, C, D, E). Find number of super keys if A, CD and BE are the…

A:

Q: Explanation of three cases when it makes sense to create a secondary key instead of the main one in…

A: The three cases when it makes more sense to create a secondary key instead of using the main key in…

Q: The trigger below is defined on the relation T (C, D) with the primary key on the attr

A:

Q: re three reasons why the main key of a relation has to be replaced with a surrogate key?

A: Here are three reasons why the main key of a relation has to be replaced with a surrogate key.

Q: Why do the functional dependencies among a relation's attributes have to do with the primary key of…

A: Dear Student, The detailed answer to your question is given below -

Q: What is partial dependency? With what normal form it is associated?

A: Partial dependency is said to be existed if there is functional dependence in which, the determinant…

Q: A foreign key can refer to only the candidate key of another relation. (a) True (b)False

A: A foreign key is a field or a set of fields (columns) in a relational database table that is used to…

Q: A relation cannot have: Multi-values attributes Several super-keys O Composite attributes Attributes…

A: Answer:

Q: The value of the candidate key cannot uniquely identify each tuple in a relation. (a) True (b)False

A: A candidate key is a set of one or more attributes (columns) in a relational database table that can…

Q: For merging two relations that are not physically sorted but share an index on the attributes in…

A: Your answer is given below.

Q: This question is based on the following relation and sample data, where Employee Social Security…

A: Actually, database is a used to stored the data.

Q: Assume a user establishes a new relation r1 that contains a foreign key that points to another…

A: The question is related to database foreign key.

Q: An attributes in a relation coming from another relation is called: * O foreign key fields…

A: An attributes in relation coming from another relation is called

Q: 2 Consider the following functional dependencies for the given relation. R={A, B, C, D, E, F) AB->CD…

A: Dear Student, The answer to your question is given below -

Q: Table_1 below has a primary key of column1. Which column(s) from this relation could be a foreign…

A: When designing a relational database, it is important to determine which columns could act as…

Q: Assume we have two relations R(A, B) and S(B, C). Assume that R = {(1, 2),(2, 3),(3, 4)}, and S =…

A: Answer:-

Q: How does a relation's primary key affect its attributes' functional dependencies?

A: Introduction: Relational databases are widely used in modern computing systems to store and manage…

Q: Based on the following functional dependencies, for the relation SCHEDULE bring it into a set of…

A: To bring the relation SCHEDULE into a set of 3NF relations, we need to identify the functional…

Q: Consider the scenario below: A user creates a new relation r1 with a foreign key referencing another…

A: Relational databases are designed to manage complex data structures efficiently. These structures…

Q: What are three reasons why the main key of a relation need to be replaced with a surrogate key?

A: substitute key: It is a key that has no contextual significance but is utilised in data analysis to…

Q: an example, suppose a eates a new relation ri with a foreign key pointing to anotner relation r2.…

A: this is about foreign key and its constarint.

Q: Describe three situations in which a substitute key for the main key of a relation should be…

A: Given: Indicators that point to the existence of a surrogate keyThere are three circumstances that…

Q: True or False: Every primary key of a relation is a superkey    No hand written and fast answer…

A: The solution is given below for the above given question:

Q: Implement a new independent entity phone in the Sakila database. Attributes and relationships are…

A: There is only one error in the above code and that is the ALTER TABLE command on the address table.…

Q: AgencyID(PK) AgencyLocation RENT AGENCY HO VehicleClassID(P K) RENT VEHICLE CLASS RentalRate has…

A: About partial dependency:…

Q: A foreign key can refer to only the candidate key of another relation. (a) True (b)False

A: A foreign key is a field or a set of fields (columns) in a relational database table that is used to…

Q: Convert the preceding ER diagram into a relational DB schema. (I want you to do this yourself, not…

A: A Database is a collection of related  information. A relational schema is a design of the database.…

Q: Which of the following functional dependencies are satisfied (and not satisfied) by this relation…

A: (a) A → B False why ?? because you can't able to identify the value of B uniquely using A because…

Q: A foreign key can refer to only the candidate key of another relation. (a) True (b)False

A: The primary key of one table is referred to by another table's foreign key, which is an attribute of…

Q: Consider the following relation for student records: GRADEREPORT(Student|D, StudentName,…

A: The relation is in 1NF because: Domain for attributes does not change. Every column/attribute has a…

Q: Below are three situations where a surrogate key could replace the relation's primary key.

A: - We need to talk about three situations where a surrogate key can replace a relations primary key.

Q: If there are more than one possible candidate keys, provide some instances of relations that have…

A: A candidate key is set of keys which uniquely identifies records. It is possible to have multiple…

Q: Normalise the following relation to remove modification anomalies showing all steps for 1NF, 2NF and…

A:

Q: 2. For the following questions, please identify the candidate keys of the given relations. You need…

A: - We need to find the keys from the relations provided.   - Candidate keys are those minimal keys…

Q: w many partial dependencies exist in the relation? v many full dependencies exist in the relation? w…

A: 1)  Closure (AE) ={A, E, B, C, D, F, G} Closure (AEI) ={A, E, I, B, C, D, F, G, H, J, K, L} Key for…

Q: The following figure shows a DB state for å library system. Indicate the violations on each…

A: Hi Let's first analyze each table. Client table    Address has 2 elements in  1 cell.  E    CID is…

Q: 5.6 LAB - Implement independent entity (Sakila) Implement a new independent entity phone in the…

A: First check whether phone_id column exists in your customer, staff, and store table or not. If…

Q: What are three cases when a surrogate key might be used in place of a relation's main key?

A: A surrogate key is an artificially generated or assigned unique identifier that is used to uniquely…

Q: A B C 10 a cl 12 b c3 D E cl C A 14 15 С c2 100 6 15 16 b cl 101 3 16 18 d c3 102 3 10 Relation re…

A: We know that Referential Integrity constraint is enforced when a foreign key references the primary…

Q: ote:- Put the answer if you are 100% sure of the answer, otherwise no  Q1:- Functional dependency…

A: Here, we are asked about the functional dependency. Functional dependency used in normalization and…

Fundamentals of Datawarehouse

A data warehouse is a data repository which is used to store large quantities of historical data that are mostly used for creating reports that help businesses to identify their weaknesses and strengths. For example, demographics data about people of a region can help businesses identify the needs and preferences of the region’s population. A data warehouse acts as a central storage for storing data that comes from one or more heterogenous sources. It also consists of data which can be old and of historical value. One of the most important applications of this type of system is that it is used for supporting business intelligence and data analytics applications.