# Collection - Bag

A bag is an un-ordered list of elements that may contains duplicates.

A bag is also known as a multiset.

## Documentation / Reference

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(Collection|Container) Data Type (Set, Bag, Sequence)

A collection is a abstract data type for grouping together multiple values. It's therefore sometime known as a container and creates a aggregation relationship A collection is: an object that groups...
(Relation|Table) - Tabular data

A Relation is a logical data structure composed of tuple (row) attribute (column, field) The following data structure are a relation: a table, a materialized view (query) (store data) a query,...
Collection - MultiSet (bag or mset)

A multiset (aka bag or mset) is a set with one big difference because it allows for multiple instances of each of its elements (ie duplicate are allowed) This is the same structure that would support...
Collection - Sequence (Ordered)

A sequence is an abstract collection: of non-unique element where order matters - ie (A,B) is not equal to (B,A) non-unique means that it allows duplicate member (the same element/value may occur...
Collection - Set

A set is: a data structure of the set theory a collection ofdistinct objects (then without duplicate) an unordered collection of objects The objects element of the set have the same type (the type...
Logical Data Modeling - Multiplicity

Multiplicity constrain the number of values that may be contained by a container (ie entity set) The multiplicity specifies valid cardinalities of the collection it represents. (It denotes the possible...
Mathematics - (Prime Factorization Theorem | Factoring integers)

For every integer N >= 1, there is a unique bag of prime numbers whose product is N. All the elements in a bag must be prime. If N is itself prime, the bag for N is just {N}. 75 is the...
PL/SQL - Collections (Datatype Table of, Varray of)

Many programming techniques use collection types. To support these techniques in database applications, PL/SQL provides three data types of collections: Associative arrays (formerly called “PL/SQL...
Pig - Relational Operators

See: Relational Operators Load : Input is assumed to be a bag Assumes that...
Relational Algebra - Expression and Operators

Relational algebra is based upon the fact that you can pass tabular data through a set of data operators (select, filter, join, sort, union, etc.) in a algebraic structure. It means that: the output...