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Database Vocabulary Itt

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Chapter 5 Vocabulary
1) Normal forms-(e) rules for removing anomalies and redundancies.
2) Update anomalies- (c) where the same data must be updated in several places creating the possibility of mismatched or inaccurate data.
3) Deletion anomalies- (a) where deleting some data inadvertently also removes other data.
4) First normal form- (i) removes repeating groups or arrays.
5) Denormalization- (j) the process of rejoining tables that were separated during the normalization process to improve performance.
6) Insertion anomalies- (h) the inability to insery data because some other unknown data is required.
7) Second normal form- (g) removes functional dependencies.
8) Transient dependencies- (f) an attribute that depends on another attribute on another attribute, not the key, for its meaning.
9) Functional dependencies- (d) attributes that are related to each other rather than the key.
10) Third normal form- (b) removes transient dependencies.

Chapter 6 Vocabulary
1) Data Types- (f) column specifications that refer to what kind of data can be stored in a column.
2) Database Transactions- (c) every action in a database.
3) Null- (b) a missing or unknown value for a column in a table.
4) Physical Design- (e) database design adapted to the features to an existing primary key in a related table.
5) Referential integrity- (d) when every foreign key refers to an existing primary key in a related table.
6) Unicode- (a) an extended language set that includes non-Latin characters.

Chapter 7 Vocabulary
1) Aggregate function- (h) a function that operates on multiple rows at a time.
2) Alias- (c) a substitute name for a column or a table.
3) Cross join- (l) a join in which each row of the first table is joined with every row in the second table.
4) DDL- (g) data definition language.
5) Declarative language
6) DML- (a) data manipulation language.

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