SQL INTERVIEW QUESTION & ANSWERS
46. |
Define data models? |
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Underlying the structure of the database is called as data model. It is a collection of conceptual tools for describing data, data relationships, data semantics and consistency constraints. |
47. |
What are the different types of data models? |
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There are different types of data models are : - Relational model
- Network model
- Entity relationship model
- Hierarchical model
- Object oriented model
- Object relational model
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48. |
Which option must be used to drop a schema that still contains database
objects? |
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The CASCADE option allows the schema to be dropped if there are still
objects under that schema. |
49. |
What is an authorization identifier? |
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An authorization identifier is an object in the SQL environment that represents a user or group of users that are granted specific access privileges to objects and data within the SQL environment. |
50. |
How does a referential constraint differ from a unique constraint? |
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Referential constraints are concerned with how data in one table relates to data in another table, ensuring referential integrity between the two tables. Unique constraints ensure the integrity within a
table by blocking duplicate values. |