In Foreign Key Concept which of the following operation on referencing table will cause violation to refrential integrity: a) Insertion b) Deletion
Q: What are the conditions where a foreign key must not be null.
A: GIVEN: What are the conditions where a foreign key must not be null?
Q: if (number>=capacity) enlarge_database (number+1);
A: In a database, whenever a new object is added, the following statement is executed to ensure that…
Q: A foreign key in a table (a) may not be composed of a single element (b) Should, in turn, be…
A: Answer : The Given MCQ Answer is option D) must belong to the primary key of the table in which it…
Q: When creating DB tables that contain foreign key references to other tables, you must: A first…
A: When creating the Data Base tables that contain foreign key references to other tables, then we must…
Q: Part of the primary key may not determine a non-key field.
A: If any relation/table is in second normal form means it dont have any partial functional…
Q: Not all versions of this database include referential integrity constraints for all foreign keys.…
A: The following types of integrity constraints are made to enforce in the sql create table commands as…
Q: Under what conditions must a foreign key not be null?
A: Answer: So basically a foreign key is used for identifying a row of another table uniquely.…
Q: Need to create ERD database ans design for 7 and 8 TABLE P6.7 ATTRIBUTE NAME SAMPLE VALUE SAMPLE…
A: Hey, since multiple questions posted, we will answer first question according to our policy. If you…
Q: 2. The data of a composite key may be as follow: a. a partial key may have null value and the others…
A:
Q: The primary key and the candidate key must be distinguished.
A: Primary key The phrase main key refers to a candidate key that the database designer selects as the…
Q: MYASQL 7. Create Avgoffreight() stored procedure to retrieve the average of freight from Orders…
A:
Q: What are the references to the main key in the same relation?
A: Introduction: The primary key constraint requires that each row in the relational database…
Q: Under what circumstances can a relation have duplicate rows?
A: GIVEN: Under what circumstances can a relation have duplicate rows?
Q: Q-1: Fill in the two blanks to only allow tuples of from_id and to id that are unique. cur.execute('…
A: The given query is to create a new table with the fields from_id and to_id. These two can be act as…
Q: Give major types of integrity constraints?
A: Domain Constraints Key constraints Referential Constraints Entity Integrity constraints
Q: Give the function of each of the following 1.union 2.database 3.Right join 4.Left join 5.insert|
A: union operation is used to combine the result of 2 queries
Q: If a DBMS enforces a DELETE RESTRICT option on the referential integrity constraint between SELLER…
A: Consider the given relation :
Q: Create a referential integrity constraint on OwnerID in PET. Assume that deletions should not…
A: Lets see the solution.
Q: 9. Which one of the following may be specified both in a WHERE Clause and a FROM Clause. a) a…
A: As per our guidelines, we are supposed to answer only one question. Kindly repost the remaining…
Q: If a non-key column determines a key column, which normal form is violated?A) 1NFB) 2NFC) 3NFD) BCNF
A: BCNF:Boyce – Codd Normal Form (BCNF) is based on functional dependencies that in a relationship all…
Q: . Normalization is the process of organizing data in a database. This includes creating tables and…
A: I have answered this question in steps 2 & 3.
Q: Write appropriate SQL DDL statements to define the database schema you made in the previous…
A: CREATE TABLE statement. The CREATE TABLE is a DDL statement that is used to create tables in the…
Q: Problem 1.10: Create the table EMP2 with all its columns from EMP1 using AS SELECT keyword. Delete…
A: Answer: To create table as similar to another table you can use syntax: create table secondTable as…
Q: "What exactly is the idea of integrity constraints
A: Introduction: Integrity constraints are the rules that a table's data columns must obey. These are…
Q: explain the function of the FOREIGN KEY definition.
A: Functions of Foreign Key: It ensures that data is integral It is a constraint that prevents actions…
Q: cher(ID, name, S ary key of the re ary of the relatic relation is 300 a maximum size
A:
Q: When the foreign key refers to a tuple which does not exists in subjected relation then the…
A: Referential integrity constraint - If a foreign key exists in a relation, then the foreign key value…
Q: Convert the following record to a normalized data structure up to 3NF showing all attributes…
A: The ask is to normalize the data structure to 3NF for the following data: Grade-Report Number…
Q: What is alternate, artificial, compound and natural key?
A: Alternate key: Alternate keys are just candidate keys except the primary keys. Artificial key:…
Q: Exercise 5.9 Discuss the strengths and weaknesses of the trigger mechanism. Con- trast triggers with…
A:
Q: Create a temporary table for V1 b) Create the appropriate trigger(s) on R that will keep V1 current…
A: One implementation technique of a view is as a temporary table. That creates the challenge for the…
Q: A foreign key is the candidate key that is selected to identify tuples. True or False.
A: Solution: A foreign key is the candidate key that is selected to identify tuples. True or False.
Q: List the trip IDs and trip names for each pair of trips that have the same start location.(You will…
A: WHERE Statement : "WHERE" statement is used limit the number of rows. For example: Consider a table…
Q: Which are the two types of integrity constraints?
A: SQL represents Structured Query Language It allows you to get to and control information bases…
Q: One of the recommendations regarding indexes is to specify a unique index for each primary key
A: IntroductionConstraints in SQL Server permits process the principles at the column level within the…
Q: 1. Normalize the following table into first (1NF), second (2NF) a third (3NF) Normal form. Identify…
A: Primary key for the given relation is {Travelar ID, TestingUnitID} The given relation is already in…
Q: The essential condition of third normal form is automatically satisfied whenA) a table has only one…
A: To solve this question a user have to know the definition of Third Normal Form (3NF):Third Normal…
Q: What is integrity cOnStrAintS?
A: Integrity constraints: Integrity constraints make sure that once the approved users modify…
Q: Assume a user creates a new relation r1 with a foreign key that links to another relation r2. What…
A: Introduction: A FOREIGN KEY is like a field (or set of fields) in one database that refers to the…
Q: How does the CHECK constraint shown below work? Which tables does it work on? CREATE TABLE DEPT_MGR(…
A: Whenever the tables are created, the constraints are given to the data in that table. This makes…
Q: Explain the difference between Primary Key and Foreign Key , give example
A: We are going to understand difference between Primary Key and Foreign Key along with examples.
Q: Explain how referential integrity is established in databases that are SQL:1999 compliant. Explain…
A: The referential integrity is established using SQL REFERENCES clause and it stops the foreign key…
Q: create a unique Key Index
A: The CREATE UNIQUE INDEX command forms a exclusive index on a table where no duplicate values…
Q: Define the term Referential integrity constraint?
A: Given: Define the term Referential integrity constraint?
Q: Assume that all the statements from Q.6.2 have been executed on the database. Determine the results…
A: Given: We are asked to give the output of this query.
Q: Exercise 5.9 Discuss the strengths and weaknesses of the trigger mechanism. Con trast triggers with…
A: The trigger is a procedure that is automatically invoked in response to a specified change to the…
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- 101. The basic operations that can be performed on relations are a. deletion b. insertion c. modification d. all of above100. When the foreign key refers to a tuple which does not exists in subjected relation then the constraint violated is a. modify integrity b. referential integrity c. inferential integrity d. insert integrityWhat distinguishes a primary key from a candidate key or a superkey?
- Please what is an independent clauseA select procedure in a relational database can shrink a table's size by deleting columns that don't fit a certain set of requirements.Is it good or bad?4. Create a dictionary named member_table that contains users’ emailaddresses as keys, and answers to their password hints as the associated values,and a function that generates a temporary new password and stored in the table.
- Syntax for drop table cascade constraints drop table with restrict syntax for On delete/update set defaultMYASQL 7. Create Avgoffreight() stored procedure to retrieve the average of freight from Orders table. Then , show the result.8. Write a database trigger TO insert the UnitPrice field.IF UnitPrice is less than 10 then make it equal to 10.(BEFORE INSERT). Test the trigger and show its result.procedure and trigger9. Select the first 10 characters of each customer's address. (Hint: You can use one of the built-in functions that are explained in functions file). (bonus, if you want to get higher mark, you can answer it, if not ,you can upload the solution file without it )1-Write the syntax to insert into a relational table called students the address column references an object table called addresses that was created using an address_type. Other columns exist in the students table, but you are only inserting into the ones below. Aliases used should be the first letter of the table name, eg students would be s, addresses would be a Relational Table Name students attribute student_id attribute surname attribute address
- Write CREATE TABLE statements to implement the following design. Include foreign key constraints. Define the individualID, and GroupID as identity columns. Decide which columns should allow null values, if any. Define Dues column with a default of zero and check constraints to allow only positive values.A select operation in a relational database decreases the size of a table by removing columns that fulfill given criteria.Is this statement truthful or false?1.9) Order of execution is critical since some operations are only meaningful after some order (i.e. having)True False 1.10) As being a sub language of SQL, DML has select, insert, update, and delete operationsTrue False 1.11) SQL does not support creating or deleting database object and granting or revoking access rightsTrue False 1.12) Common Table Expression (CTE) is only used to develop recursive SQL queriesTrue False