Which of the following options are possible to implement referential integrity?
(a) No Action
(b) Set Null
(c) Delete table
(d) Update Cascade
field with which of the following datatype?
Answers
Answer:
Update Cascade
Explanation:
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Answer:
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Details
Rules for creating foreign keys
Null values
Composite foreign key matching
Foreign key actions
Performance
Syntax
Column level
Table level
Usage examples
Use a foreign key constraint with default actions
Use a Foreign Key Constraint with CASCADE
Use a Foreign Key Constraint with SET NULL
Use a Foreign Key Constraint with SET DEFAULT
Add multiple foreign key constraints to a single column
Match composite foreign keys with MATCH SIMPLE and MATCH FULL
See also
A foreign key is a column (or combination of columns) in a table whose values must match values of a column in some other table. FOREIGN KEY constraints enforce referential integrity, which essentially says that if column value A refers to column value B, then column value B must exist.