Apriso Developer
Apriso Developer Interview Questions and Answers

Asked in ITC Infotech

Q. The PRIMARY KEY constraint uniquely identifies each row in a table. It must contain UNIQUE values and has an implicit NOT NULL constraint. A table in SQL is strictly restricted to have one and only one primary...
read moreThe PRIMARY KEY constraint uniquely identifies each row in a table and must contain unique values.
A primary key is a column or a combination of columns that uniquely identifies each row in a table.
It ensures data integrity by preventing duplicate or null values in the primary key column(s).
Primary keys are used to establish relationships between tables through foreign keys.
Primary keys can be composed of a single column or multiple columns.
Example: In a table of employees, th...read more

Asked in TCS

Q. What is a Primary Key?
A primary key is a unique identifier for a record in a database table.
Primary key ensures each record in a table is unique.
It is used to establish relationships between tables.
Primary key can be a single column or a combination of columns.
It enforces data integrity and allows efficient data retrieval.
Example: In a table of students, the student ID can be the primary key.
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