Interested to Buy Any Domain ? << Click Here >> for more details...
Define candidate key, alternate key, composite key?
- 30 Answers
- 144509 Views
- IAS, IBM, I also Faced
- E-Mail Answers
Answer Posted / deependra kumar shukla
Candidate key:- A key 'X' is said to be candidate key if proper subset of 'X' is not a key where X is simple or composite key.
Alternate key:- A candidate key is said to be Alternate key if it is not defined as primary key.An Alternate key may accept null values.
Composite key:- A key is said to be composite key if it contain more than one atribute of the relation.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
What are the three basic rules which are to be followed for the relational model of the database?
How to customize error conditions.
Explain about xml databases?
How to combine two function together?
What is DB Development software?
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
Write the fastest query to find out how many rows exist in a table?
How long can an error message be in raiseerror function?
To convert IDMS to DB2, how to deal with IDMS occurs and redefined clause?
Explain the rollup operator?
Can an extended stored procedure be called from inside a user-defined function?
Write short notes on manual refreshes.
You are testing the performance of a query the first time you run the query, the performance is slow. the second time you run the query, the performance is fast. why is this?
If a column is an image value type, how you can compare column values? How can you use this column in join clause?
1. Using the XML Document below, with the URI “recipe.xml”
define
the following queries in XQuery:
a.) Give the names of all breakfast in the menu.
b.) Select breakfasts that have price lower than $7.00?
