Question

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?​

Answer 1

Answer:

Update Cascade

Explanation:

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Answer 2

Answer:

☆Aɴsᴡᴇʀ࿐

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.