A Primary Key Is Which of the Following

Which of the following is not allowed for primary keys. Which of the following statements is correct.

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Primary key field can have a character value.

. A primary key is a field in a table which uniquely identifies each rowrecord in a database table. The property of the primary key in a table in Microsoft Access should be set to. Foreign keys if not empty must be a primary key in another table.

The primary key selected to be the key of a relation. You can never enter two records with the same value for the primary key field s Given a value of the primary key field s you can find a unique row in the table The primary key field s functionally determine all other holds in the table The primary key must always include an auto. A primary key column which also serves as foreign key reference in another table D.

The PRIMARY KEY NOT NULL and CHECK are the constraints that specify rules for data insertion. Which of the following is not a valid field of table Student. Most tables in a database may not require primary keys.

Which of the following is NOT true regarding primary keys. What is a primary key. The same thing as a primary key.

A primary key is which of the following. Which of the following are requirements of a relational database. The required field Yes the Indexed field Yes No Duplicates B.

There can be multiple primary keys in a table. Primary key may not contain duplicate values. Duplication of primary keys within a table.

In the world of databases the primary key of a relational table uniquely identifies each record in the table. SQL Server Objective type Questions and Answers. A primary key is a column of table which uniquely identifies each tuple row in that table.

Constraint specifies the rule to allow or restrict what data will be stored in a table. Which of the following columns in a table cannot be updated. SQL - Primary Key.

The fields include name address company phone email and customer ID. Primary key value matching a foreign key of a related table. An attribute or group of attributes that can be the primary key.

Primary key may contain duplicate values. Primary key field can have zero value. A primary key is a special relational database table column or combination of columns designated to uniquely identify.

4 When entering an order quantity the user must input a number and not some text ie 12 rather than a dozen Solution. In DynamoDB a primary key can be a range of values. Primary key enforces integrity constraints to the table.

In DynamoDB a primary key can be composite partitionsort key. All of the above. A database table must have a primary key for Optim to insert update restore or delete data from a database table.

1 The absence of a value in a column of a row always indicates the completeness data quality problem. DBMS Objective type Questions and Answers. All non-key primary and foreign attributes must describe a quality of the item identified by the primary.

A foreign key is which of the following. The Required field Yes and the Indexed field. Primary keys implement a technical mechanism to check if every row has a unique non-empty value in the primary key column.

Databases use keys to compare sort and store records and to create relationships between records. In DynamoDB a primary key. Unique key constraints also identifies an individual tuple uniquely in a relation or table.

Which of the following is a good candidate for a primary key. Any attribute An attribute that uniquely identifies each row An attribute that uniquely identifies each column A derived attribute. Multiple Choice The data values of a primary key must be different ie unique.

A table can have only one primary key. A primary is always another tables foreign key. Primary Key is a combination of Unique and NOT NULL Constraints so it cant have duplicate values or any NULL values.

To include integrity constraint in an existing relation use. X A primary cannot be used in another table as a foreign key. Primary key with a non-numeric value.

DATE type columns in the table B. Primary keys must contain unique values. The Required field NO and the Indexed field Yes No Duplicates C.

A primary key column cannot have NULL values. Optim uses primary keys that are defined to the database. The administrator is using the customer ID to uniquely identify each customer record.

A directory of Objective Type Questions covering all the Computer Science subjects. A primary key is the column or columns that contain values that uniquely identify each row in a table. Primary key field helps to check redundancy of data.

Primary key value not matching any foreign key of. Primary key field can have zero value. So these were the CBSE Class 10 IT 402 Unit 3 Database Management System MCQ questions with answers.

An attribute that serves as the primary key of another relation. Columns which allows NULL values in the table C. A database administrator is setting up a new table that will contain customer information.

A primary key is a column of table which uniquely identifies each tuple row in that table. Primary key field can have a null value. UNIQUE Primary key Foreign key None of the mentioned.

You can view the primary key as the main identifier for every row in the table based on a certain column. Which of the following is a correct statement about primary keys. Answer - Union.

UNION is an operator that combines two or more results from multiple SELECT queries into a single result set. A Key which uniquely identifies each row in the table is known as Primary Key. In DynamoDB a primary key must be a single-attribute.

The primary key selected to be the key of a. Information on the customer must be known before anything can be sold to that custome.

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