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Frequently Asked Questions
Thus, integrity constraint is used to guard against accidental damage to the database. 1. Domain constraints Domain constraints can be defined as the definition of a valid set of values for an attribute.What is data integrity in database?
This means that the data in the database is accurate and reliable. You may apply integrity Constraints at the column or table level. The table-level Integrity constraints apply to the entire table, while the column level constraints are only applied to one column.What are referential integrity constraints in SQL?
Referential Integrity Constraints A referential integrity constraint is specified between two tables. In the Referential integrity constraints, if a foreign key in Table 1 refers to the Primary Key of Table 2, then every value of the Foreign Key in Table 1 must be null or be available in Table 2.What are SQL DDL constraints?
It defines constraints in SQL DDL commands such as 'CreateTable' and 'Alter Table.' Integrity Constraints are the protocols that a table's data columns must follow. These are used to restrict the types of information that can be entered into a table. This means that the data in the database is accurate and reliable.