0
Duplicate tuples are not allowed in a relation to ensure the integrity and uniqueness of the data. In a relational database, each tuple (or row) represents a unique entity or record, and allowing duplicates would create ambiguity and inconsistencies in data retrieval and manipulation. This principle also supports efficient indexing and searching, as unique identifiers like primary keys can be used to distinguish records. Overall, preventing duplicates helps maintain the relational model's foundational rules and enhances data reliability.
What else can I help you with?
How many cards must you draw from a regular deck of 52 playing cards to be sure at least 2 are from the same suit?
5. Assuming the first four are all different suits, the 5th card must be a duplicate suit. If any prior to the 5th card is not a new suit, it is garunteed to be a duplicate of a prior suit.
How many 3 digit number can be made using the digits 2 4 7 9?
24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.
How many five digit numbers can be formed using 0 1 2 3 4 5 if repetitions are not allowed?
543210
How many 4 digit numbers can be formed using the digits 0 1 2 3 4 5 6 if repetitions of digits are allowed?
2,401
What is the relation between chi square distribution and f distribution?
A quick answer: F is the ratio of two Chi squared divided by their degrees of freedom respectively. Where: * (X1)2 & (X2)2 are the Chi squared for the variables 1 & 2 respectively (formatting issues prevented proper use of Greek letters for Chi sq) * v1 & V2 are the degrees of freedom (also refered to as df) respective to the variables 1 & 2
What is difference between natural join and semi join?
The result of the natural join is the set of all combinations of tuples in R and S that are equal on their common attribute names.The result of the semijoin is only the set of all tuples in R for which there is a tuple in S that is equal on their common attribute names.The point is that natural join is a set of all combinations and semijoin is only the tuples from the first relation not a combination between the two.For example:R1 R2A B B C1 2 2 31 3 3 41 4 5 3R1 (natural join) R2 =A B C1 2 31 3 4whereas R1(semijoin) R2 =A B1 21 3So in a way semijoin selects and returns a table of only the tuples from R1 that have an equal attribute with R2
What types DVD Playstation 2 duplicate?
The PS2 does not have a DVD writer only a reader and can not Duplicate any DVD
Can you still duplicate in dead rising 2?
Yes
6 What is cloning?
cloning is were you duplicate a pokemon.(make 2 of them).
What are the release dates for The Outer Limits - 1963 The Duplicate Man 2-13?
The Outer Limits - 1963 The Duplicate Man 2-13 was released on: USA: 19 December 1964
What are the ratings and certificates for In Plain Sight - 2008 Duplicate Bridge 2-7?
In Plain Sight - 2008 Duplicate Bridge 2-7 is rated/received certificates of: USA:TV-PG
What is the process of making 2 duplicate strands of DNA called?
Replication
Example for first normal form?
A relation is said to be in 1NF iff each arttribute of the relation is atomic i.e each column must contain only single value. basic rules for 1NF 1.eliminate duplicate column from the same table 2.create separate table for a gr. of related data and distinguish each row with a unique column or set of column
What Does Clone A Pokemon Mean?
it means to duplicate a Pokemon and make 2 or more of it
Is there any relation between The Sisterhood of the Traveling Pants 2 and Mama Mia?
no relation
Where can you get your 12th class duplicate mark sheet delhi board year 2002?
Open Google.com & Type the Boards name along with some words like "Duplicate Certificate" and u should get ur Answer. For E.g If a person wants to apply for a Duplicate Certificate in NIOS 1) Opened Google. 2) Typed NIOS Duplicate Certificate 3) Select the suitable link
Do chromsones duplicate between meiosis 1 and 2?
They do during meiosis I and II but not right in between.
