Interested to Buy Any Domain ? << Click Here >> for more details...
Define candidate key, alternate key, composite key?
- 30 Answers
- 145529 Views
- IAS, IBM, I also Faced
- E-Mail Answers
Answer Posted / piyush kathayat
primary key:- The attribute or combination of attributes
that uniquely identifies a row or record.
Foreign Key:- an attribute or combination of attribute in a
table whose value match a primary key in another table.
Composite key:- A primary key that consistsof two or more
attributes is known as composite key
candidate key:- is a column in a table which has the
ability to become a primary key.
Alternate Key:- Any of the candidate keys that is not part
of the primary key is called an alternate key.
| Is This Answer Correct ? | 587 Yes | 62 No |
Post New Answer View All Answers
A) Which two are benefits of Teradata's support for ANSI Standard SQL? (Choose two.) 1.data is distributed automatically 2.queries get optimized to better plans 3.submit queries from other database systems 4.can interface with BI tools B) Which statement is true when comparing the advantages of third normal form to star schema? 1.Star schema tends to have fewer entities. 2.Star schema requires additional data storage. 3.Third normal form tends to have fewer entities. 4.Third normal form requires additional data storage. C)Which two sets of functions does the Parsing Engine (PE) perform? (Select two.) 1.sorting, formatting, and aggregating of the final answer set 2.flow control of the data to and from the participating tables 3.SQL statement interpretation, syntax validation, and semantic evaluation 4.dispatching the step execution sequence to the AMP via the BYNET D) Which two can be achieved with Teradata Active System Management (TASM)? (Choose two.) 1.disable hardware 2.react to hardware failure 3.influence response times 4.collect metadata E) Which three mechanisms can be used to ensure security within the Teradata Database? (Choose three.) 1.views 2.spool limits 3.roles 4.access rights 5.profiles
What are the 18 schemas?
How to use timestamp datatypes
What is the physical representation for a many-to-many relationship?
Who are naive users?
On friday, you issued several insert statements using query analyzer. You then verified the data had been correctly entered with a select statement on monday, your users report that the data is not there what happened?
Explain the role of indexing in databases?
Any sample or model question of punjab national bank for deputy manger IT or any sample of PNB.any1 plz do send on
You have a table with three columns: amount1, amount2, and amount3 in a single row only one of these three columns will have a value and the other two will be null. Write a sql query to retrieve the values from these columns?
I HAVE A PI ON COL A THE NEXT DAY I WANT CHANGE THE PI ON COL B? PLS SEND ME THE ANS
What you can do to remove data from the cache and query plans from memory for testing the performance of a query repeatedly?
Explain about the relational database?
Hi , any one can help me on the same,this is regarding the Informatica Function doc,i want to know how developer is will develop the mapping. pl forwar the any function doc .just for my references. svlc75@yahoo.co.in
What is the database development process?
You have two tables with a one to many join based on a field named id. You need to find records in the parent table that are not represented in the child table. how would you accomplish this?
