Answer / shikha

PersonID
PersonID + LastName
PersonID + FirstName
PersonID + DOB
PersonID + LastName + FirstName
PersonID + LastName + DOB
PersonID + FirstName + DOB
PersonID + LastName + FirstName + DOB
LastName + FirstName + DOB
All of these will uniquely identify each record, so each
one is a superkey. Of those keys, a key which is comprised
of more than one column is a composite key; a key of only
one column is a simple key.

A candidate key is a superkey that has no unique subset; it
contains no columns that are not necessary to make it
unique. This table has 2 candidate keys:

PersonID
LastName + FirstName + DOB
Not all candidate keys make good primary keys: Note that
these may work for our current data set, but would likely
be
.

What the class forname () does?

0 Answers  

---

What are the types of indexing?

0 Answers  

---

How do you troubleshoot SQL Server if its running very slow?

2 Answers   HP,

---

How to create a ddl trigger using "create trigger" statements?

0 Answers  

---

How to access the deleted record of an event?

0 Answers  

---

List out a number of the wants to setup a SQL Server failover cluster?

0 Answers  

---

Can you tell me the difference between DELETE & TRUNCATE commands?

15 Answers  

---

Can the “if update (colname)” statement be used in a delete trigger?

0 Answers  

---

What is difference between views and stored procedures?

0 Answers  

---

How check triggers in sql server?

0 Answers  

---

Can you explain what are various ways to enhance the ssrs report?

0 Answers  

---

What you can do to delete a table without the delete trigger firing?

0 Answers  

---