What is a primary key? How do we set a primary key? -Technology

What is a primary key? How do we set a primary key? -Technology
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Answer :

Primary key is the key which is used to uniquely identify the records into the table. To set the primary key you have to follow the steps given below:Step 1 Select the field that you want to set as a primary key.Step 2 Click Primary Key button from the Design tab.orRight click on the selected field and select Primary Key.
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Related questions

Define primary key. How do you set it in MS_Access? -Technology

Description : Define primary key. How do you set it in MS_Access? -Technology

Last Answer : Primary key is the key which is used to uniquely identify the records into the table. To set the primary key you have to follow the steps given below:Step 1 Select the field that you want ... 2 Click Primary Key button from the Design tab.orRight click on the selected field and select Primary Key.

What is a primary key? -Technology

Description : What is a primary key? -Technology

Last Answer : A field which uniquely identifies each record in a table is known as the primary key. e.g. emp id is the primary key of the Employee table.

Define primary key with an example. -Technology

Description : Define primary key with an example. -Technology

Last Answer : A field which uniquely identifies each record in a table is known as the primary key. e.g. emp id is the primary key of the Employee table.

What is primary key? Give an example. -Technology

Description : What is primary key? Give an example. -Technology

Last Answer : A field which uniquely identifies each record in a table is known as the primary key. e.g. emp id is the primary key of the Employee table.

What is a primary key in database? Give an example. -Technology

Description : What is a primary key in database? Give an example. -Technology

Last Answer : A field which uniquely identifies each record in a table is known as the primary key. e.g. emp id is the primary key of the Employee table.

Give one advantage of using primary key. -Technology

Description : Give one advantage of using primary key. -Technology

Last Answer : A primary key uniquely identifies the record in the table.

What is the significance of a primary key? -Technology

Description : What is the significance of a primary key? -Technology

Last Answer : A primary key cannot allow null values and must have a unique index.

What is the utility of primary key in database? Write distinct features of primary keys. -Technology

Description : What is the utility of primary key in database? Write distinct features of primary keys. -Technology

Last Answer : The primary key is used to uniquely identify the record in a database. It can be a column or a set of columns in the table.Main features of the primary key are as follows:1. It must contain a unique value for each record of the table.2. It does not contain null values.

Which of the following fields will not make a suitable primary key? (a) A customer’s account number -Technology

Description : Which of the following fields will not make a suitable primary key? (a) A customer’s account number -Technology

Last Answer : (b) From the given options, the data field can not be set as a primary key because it can’t be fixed for an object.

Primary key is used to …………….. identify the record. -Technology

Description : Primary key is used to …………….. identify the record. -Technology

Last Answer : Primary key is used to uniquelyidentify the record.

The candidate key, which is not used as primary key is called ………….. key. -Technology

Description : The candidate key, which is not used as primary key is called ………….. key. -Technology

Last Answer : The candidate key, which is not used as primary key is calledalternate key.

Primary key field gives us permission to record duplicate entry. -Technology

Description : Primary key field gives us permission to record duplicate entry. -Technology

Last Answer : False A primary key is a key which identifies records uniquely in a table so it does not give us permission to record duplicate entry.

A primary key field does not allow numbers. -Technology

Description : A primary key field does not allow numbers. -Technology

Last Answer : False Primary key has to identify a unique value which can be present in a table, in a number form also. It means primary key field allow number too.

A primary key value can be NULL. -Technology

Description : A primary key value can be NULL. -Technology

Last Answer : False The primary key of table is used to uniquely identify each and every row in the table. So, its all keys and columns must be defined as NOT NULL.

A foreign key is a primary key in another table. -Technology

Description : A foreign key is a primary key in another table. -Technology

Last Answer : True When a table’s primary key field is added to a related table in order to create the common field which relates two tables, it is called a foreign key in the related table.

…………. is a field which is used as a primary key and numbers each record sequentially. -Technology

Description : …………. is a field which is used as a primary key and numbers each record sequentially. -Technology

Last Answer : AutoNumberis a field which is used as a primary key and numbers each record sequentially.

What is a primary key in a table? -Technology

Description : What is a primary key in a table? -Technology

Last Answer : A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each & every table record. It does not contain NULL & duplicate values

Write any one similarity and one difference between primary key and unique Constraint. -Technology

Description : Write any one similarity and one difference between primary key and unique Constraint. -Technology

Last Answer : Similarity: Column with both the constraints will only take unique values.Difference: Column with Primary key constraints will not be able to hold NULL values while Column with Unique constraints will be able to hold NULL values.

Identify the primary key column of Train and Reservation. -Technology

Description : Identify the primary key column of Train and Reservation. -Technology

Last Answer : (i) Train-TrainIdReservation-RefNo(ii) (d) By default, the UNION operator selects all the values.

Write any one similarity and one difference between primary key and unique Constraint -Technology

Description : Write any one similarity and one difference between primary key and unique Constraint -Technology

Last Answer : Similarity: Column with both the constraints will only take unique values.Difference: Column with Primary key constraints will not be able to hold NULL values while Column with Unique constraints will be able to hold NULL values.

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Which of the following statements is FALSE about weak entity set ? (A) Weak entities can be deleted automatically when their strong entity is deleted. (B) Weak entity set avoids the data duplication and consequent possible inconsistencies caused by duplicating the key of the strong entity. (C) A weak entity set has no primary keys unless attributes of the strong entity set on which it depends are included. (D) Tuples in a weak entity set are not partitioned according to their relationship with tuples in a strong entity set.

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Write the significance of a foreign key. -Technology

Description : Write the significance of a foreign key. -Technology

Last Answer : A foreign key is used to Establish the relationship between any two tables of RDBMS.

Key field is a unique identifier for each record. It is defined in the form of (a) rows (b) columns -Technology

Description : Key field is a unique identifier for each record. It is defined in the form of (a) rows (b) columns -Technology

Last Answer : (b) Key is a data item that allows you to uniquely identify individual occurrences which is defined as the column or set of columns.

A foreign key is a reference of the ………….. key in another table. -Technology

Description : A foreign key is a reference of the ………….. key in another table. -Technology

Last Answer : A foreign key is a reference of the primary keyin another table.

Which shortcut key is used to make the selected text italic? (a) Ctrl +I (b) Shift +I (c) F1 + I (d) None of these -Technology

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Last Answer : (a) Ctrl+I is the shortcut key to make the selected text italic.

What is the use of Enter and Esc key in a Slide Show? -Technology

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Control Unit is called the ………….. of a computer system. (a) heart (b) nerve centre (c) primary memory (d) All of these -Technology

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Name two possible primary keys for an Employee table. -Technology

Description : Name two possible primary keys for an Employee table. -Technology

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A table can have multiple primary keys. -Technology

Description : A table can have multiple primary keys. -Technology

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Description : Name the primary law in India dealing with cyber crime and electronic commerce. -Technology

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Description : Program is a set of …….. -Technology

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The set of programs designed to perform user specific tasks is called application software. -Technology

Description : The set of programs designed to perform user specific tasks is called application software. -Technology

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Description : A set of related data item is called as ……………. -Technology

Last Answer : A set of related data item is called as record.

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Which property should be set, if it is required that ‘Delhi’ is automatically -Technology

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Write one example of data field for which you would set the Required property to Yes? -Technology

Description : Write one example of data field for which you would set the Required property to Yes? -Technology

Last Answer : In a table, when we declare a field as a primary key, then the field’s Required property must be set to Yes because, in a primary key field, we need to enter data always.

Microsoft Office Access 2007 includes a set of database ………… which are designed for specific business needs. -Technology

Description : Microsoft Office Access 2007 includes a set of database ………… which are designed for specific business needs. -Technology

Last Answer : Microsoft Office Access 2007 includes a set of database templates which are designed for specific business needs.

Write HTML code to set the image ‘Pen. jpg’ stored in ‘My Pictures’ folder in C: -Technology

Description : Write HTML code to set the image ‘Pen. jpg’ stored in ‘My Pictures’ folder in C: -Technology

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Description : Write the HTML code to set the bgcolor as pink, heading level 2, text -Technology

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