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You can see that there are multiple rows in the patients table

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Table 1.0: An example of Patient’s Table

Table 1.0 contains patients’ information such as its Id, Name, Gender, Age, Blood Group and Phone.

Rows

Each row in the database table contains record of one instance of the entity. You can see that there are multiple rows in the patient’s table. Here each row contains record of one patient. No two rows can have record of one patient.

Columns

A table column store information about particular attribute of the entity. For instance, if you look at the Table 1.0, each column contains values that correspond to a particular patient attribute. The Name column contains names of the patient, similarly the age column stores information about patients’ ages.

Primary Key

Primary key is used to uniquely identify records within a table. The column that contain primary key is called primary key column. Each value in the primary key column should be unique. No two or more than two records can have same value for their primary key column. In Table 1.0 the Id column is the primary key column.

Foreign Key

Foreign keys are used to create relationship between two tables. Foreign key column contains values from the primary key column of some other table.

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