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Tuple is a collection of one or more attributes or rows present in a table.

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14y ago

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Why does SQL allow duplicate tuples?

There are many reasons why SQL allows duplicate tuples (rows):To store non-unique values.To simply remove primary keys, unique indexes, and unique constraints.It allows this if there is no unique constraint.


Which construct in SQL is used to test whether a subquery has any tuples in its result?

Exists


What is a full outer join sql?

Join is used to combine related tuples from two relations . Full outer join cover all possible combinations of common tuples.


What provides the ability to query information from the database and to insert tuples into delete tuples from and modify tuples in the database?

SQL (Structured Query Language) provides the ability to query, insert, delete, and modify data in a database. It is a standard language used for managing and manipulating relational databases. By using SQL commands, users can interact with the database to retrieve, add, change, or remove data as needed.


What is Manipulate Language?

DML is a subset of SQL (Structured Query Language) that is used to insert, delete and revise records (or 'tuples') in a relational database. The precise definition of DML varies considerably with the database system with which it is associated.


What is data manipulating language?

DML is a subset of SQL (Structured Query Language) that is used to insert, delete and revise records (or 'tuples') in a relational database. The precise definition of DML varies considerably with the database system with which it is associated.


Why duplicate tuples are not allowed in DBMS?

Since relation is a set, and tuples are element of a set, according to set theory, the elements of a set are not ordered.


Tuple in dbms?

rows are called tuples


Where could someone find an SQL formatter?

One can find an SQL formatter from: SQL Format, Free Formatter, Poor SQL, T-SQL Tidy, Stack Overflow, SQL Inform, Apex SQL, SQL Parser, Red Gate software, to name a few.


What is the difference between T-sql and sql?

T-SQL is Microsoft's version of the generic SQL langauge to be used with, for example, Microsoft SQL Server.


Why do duplicate tuples not allowed in a reaction?

Duplicate tuples are not allowed in a reaction because each reactant and product must be listed only once to accurately represent the stoichiometry of the reaction. Including duplicate tuples would result in an incorrect representation of the reactants and products involved, leading to inaccuracies in the reaction equation.


Why are tuples in a relation not ordered?

A relation is defined as a set of tuples. Mathematically, elements of a set have no order among them; hence, tuples in a relation do not have any particular order. In other words, a relation is not sensitive to the ordering of tuples. Tuple ordering is not part of a relation definition because a relation attempts to represent facts at a logical or abstract level. Many logical orders can be specified on a relation but there is no preference for one logical ordering over another.