A Primary Key Is Which of the Following

A name is provided to specify the Java attribute. Unique key constraints also identifies an individual tuple uniquely in a relation or table.

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A primary key column in the database table can be defined by the id tag.

. Which of the following options may result in the following. Determines the tablespace required. They can be used as reference for other columns in a related table.

1 Assume that Table B has a foreign key referring to a primary key in Table A. Which Of The Following Tags Is Used To Map The Primary Key In Hibernate Mapping Xml. A and C f.

Select all that apply. Which of the following is not true about primary keys. Deleting a row in Table A will cause a deletion of a row in Table B.

The _____ states that no primary key attribute may be null. UNION is an operator that combines two or more results from multiple SELECT queries into a single result set. Asked Jun 11 2016 in Business by Bernardo.

Assume that Table B has a foreign key referring to a primary key in Table A. Java class attributes are named. Constraint specifies the rule to allow or restrict what data will be stored in a table.

A primary key is a column of table which uniquely identifies each tuple row in that table. 1 The absence of a value in a column of a row always indicates the completeness data quality problem. Primary key field can have zero value.

The primary key selected to be the key of a relation. Assume that Table B has a foreign key referring to a primary key in Table A. The _____ states that no primary key attribute may be null.

A table can have only one primary key. SQL Server Objective type Questions and Answers. They can NOT be NULL B.

The PRIMARY KEY NOT NULL and CHECK are the constraints that specify rules for data insertion. Which of the following options may result in the following. DBMS Objective type Questions and Answers.

A Key which uniquely identifies each row in the table is known as Primary Key. They can NOT be character data type D. An attribute or group of attributes that can be the primary key.

It can be NULL as long as the FOREIGN KEY contains. Dependencies based on only a part of a composite primary key are known as _____ dependencies. A primary key column cannot have NULL values.

In defining Primary key which of the following is wrong statement. A primary key is the attribute or combination of attributes that identifies entity instances in an entity set. B Primary keys must be unique.

A and D g. A secondary key is which of the following. Asked May 31 2020 in Computer Science Information Technology by crz3nee.

Choose two S DBMS. When the primary key is made up of two or more columns then it is called __ primary key. What is the method of specifying a primary key in a schema.

Rows containing valid foreign keys are inserted when the primary key is inserted. What is the method of specifying a primary key in a schema description. To Fix the database after the Failure such as a Hard Disk.

A primary key is the attribute or combination of attributes that uniquely identifies entity instances in an entity set. A primary key is which of the following. Databases use keys to compare sort and store records and to create relationships between records.

Under which two circumstances do you design database triggers. Primary key field can have a null value. A buit-in temperature sensor is used by the signal processing circuitry to provide stable outputs across the temperature range -40 degree celcius to 85 degree celcius.

It identifies which column s uniquely identify each record. Useful for denormalization decisions. A directory of Objective Type Questions covering all the Computer Science subjects.

Deleting a row in Table B will cause a deletion of a row in Table A. In the world of databases the primary key of a relational table uniquely identifies each record in the table. UNIQUE Primary key Foreign key None of the mentioned.

SQL - Primary Key. An attribute that uniquely identifies each column. To duplicate the functionality of other triggers.

E Primary keys can be defined using an SQL CONSTRAINT phrase. Primary key field helps to check redundancy of data. D Primary keys are used to represent relationships.

DELETE RESTRICT DELETE CASCADE DELETE SET-TO-NULL DELETE. What is a primary key. Which of the following field of table Book can act as the primary key.

A Primary keys cannot be null. Any attribute An attribute that uniquely identifies each row An attribute that uniquely identifies each column A derived attribute. A primary key is which of the following.

Primary keys must contain unique values. Which of the following statements about a PRIMARY KEY is incorrect. An attribute that uniquely identifies each row.

To replicate built-in constraints in the Oracle server such as primary key and foreign key. A primary key is a field in a table which uniquely identifies each rowrecord in a database table. Answer - Union.

If a PRIMARY KEY constraint named ORDERITEMS_PK exists for the ORDER and ITEM columns of the ORDERITEMS table which of the following commands will disable the constraint. Primary key field can have a character value. Which device generates output signal when metal objects are either inside or entering into sensing area.

The function of the primary key is to guarantee entity integrity and to describe the entity. Question 7 2 points When the action Cascade propagates the changes made to a primary key to the associated foreign key which of the following are the outcomes. C Primary keys must be a single attribute.

Which of the following statements about a primary key. Primary key enforces integrity constraints to the table. Rows containing invalid foreign keys are deleted when the primary key is deleted.

Onlyunique values can be assigned to them columns in a related table C. Which one of the following attribute can be taken as a primary key.

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