INTRODUCTION TO ENTREPRENEURSHIP
DEFINITION OF ENTREPRENEURSHIP
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A field in a table that is written in another language
|
|
|
A field in a table that links to the World Wide Web
|
|
|
A field in a table that cannot be edited or accessed by users
|
|
|
A field in a table that is used as a link to a field in another table
|
Detailed explanation-1: -A foreign key column in a table points to a column with unique values in another table (often the primary key column) to create a way of cross-referencing the two tables. If a column is assigned a foreign key, each row of that column must contain a value that exists in the ‘foreign’ column it references.
Detailed explanation-2: -A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table. The table with the foreign key is called the child table, and the table with the primary key is called the referenced or parent table.
Detailed explanation-3: -In a foreign key reference, a link is created between two tables when the column or columns that hold the primary key value for one table are referenced by the column or columns in another table. This column becomes a foreign key in the second table.
Detailed explanation-4: -Foreign Key: A column or set of columns in a relational database table known as a foreign key serves as a connection between the data in two different databases. It refers to the primary key of another table, creating a link between the two tables and serving as a cross-reference between them.
Detailed explanation-5: -Since the purpose of the foreign key is to identify a particular row of referenced table, it is generally required that the foreign key is equal to the candidate key in some row of the primary table, or else have no value (the NULL value.). This rule is called a referential integrity constraint between the two tables.