COMPUTER SCIENCE AND ENGINEERING
DATABASE MANAGEMENT SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Primary key
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Foreign key
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Secondary key
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Non of the above
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Detailed explanation-1: -The foreign key here signifies the data or information category in a specific table, that is indicated in the new table as the primary key column. Thus the, the foreign key helps to determine the relationship among tables.
Detailed explanation-2: -A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table.
Detailed explanation-3: -A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table. In order to add a row with a given foreign key value, there must exist a row in the related table with the same primary key value.
Detailed explanation-4: -The primary key uniquely identifies a record in the table. A foreign key is a field in the table that is the primary key in another table. Primary Key can’t accept null values. A foreign key can accept multiple null values.
Detailed explanation-5: -Foreign Key is used to establish relationships between two tables. A foreign key will require each value in a column or set of columns to match the Primary Key of the referential table. Foreign keys help to maintain data and referential integrity.