HOW SHALL WE DIFFERENTIATE BETWEEN PRIMARY KEY AND FORIEGN
KEY?
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Answer / kaleel
Each row of data in a table is uniquely
identified by a primary key
• You can logically relate data from multiple
tables using foreign keys
| Is This Answer Correct ? | 3 Yes | 2 No |
Answer / manoj byregowda
Primary key- A column (or columns)in a table which makes every row in table unique. eg - EMPLOYEE table, EMPID is column which is unique.
Foreign Key - A column (or columns) in table Whose value References to primary key of another table OR ( A column which derives its value from another tables primary key.)
eg - EMP table EMPID is PK and DEPTNO is FK.
DEPT table DEPTID is pk.
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Answer / mkjmkumar
Primary Key Column or Columns Containt Unique Values.
Foreign Key Column or Columns does not contains Unique
Values in Table
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Answer / mukhtiar ahmed
primary key
A column (or columns) in a table that makes the row in the
table distinguishable from every other row in the same
table.
foreign key
A column (or columns) in a table that draws its values from
a primary or unique key column in another table. A foreign
key assists in ensuring the data integrity of a table.
| Is This Answer Correct ? | 1 Yes | 3 No |
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