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One-to-one (1:1) relationship: This relationship is a situation where only one instance of either entity can be related to an instance of the other entity For example, a person could have only one legal social security number (SSN), and each SSN should refer to just one person Many-to-many (M:M) relationship: In this situation, each instance of entity A is related to one or more instances of entity B, and an instance of entity B is related to one or more instances of entity A As an example, let s take an entity called Movie Star and an entity called Movie Each Movie Star can star in several Movies, and each Movie may have several Movie Stars In real life, a many-to-many relationship is usually broken down into a simpler oneto-many relationship, which happens to be the predominant form of cardinality in the relationships among entities.

Accurately determining cardinalities of relationships is the key to a well-designed relational database Duplicated data, redundancy, and data anomalies are some of the problems that arise when you don t model relationship cardinalities correctly..

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Candidate keys are those attributes that can uniquely identify a row in a table, and a table can have more than one candidate key. For example, it s fairly common for an employee table to have both a uniquely generated sequence number as well as another identifier, like an employee number (or social security number). (Of course, any whole row, itself, could serve as a candidate key, because by definition a relational model can t have any duplicate tuples. However, a whole row is rarely used as the key, since the point of a key is to easily access the row.) The primary key is the candidate key that s chosen to uniquely identify each row in a table. You should always strive to select a key based on a single attribute rather than on multiple attributes, for simplicity and efficiency. Keys are vital when you come to the point of physically building the entity-relationship models. A natural primary key is one that consists of data items or entity attributes. Almost all modern relational databases, including Oracle databases, also offer simple system numbers or sequenced numbers that are generated and maintained by the RDBMS as an alternative to a natural primary key (such as a sequence number to identify orders). Such keys are often referred to as surrogate or artificial primary keys. Whatever method you choose a natural key or a surrogate key certain rules apply: The primary key value must be unique. The primary key can t be null (blank). The primary key can t be changed (it must remain stable over the life of the entity). The primary key must be as concise as possible.

SQLite doesn t have a configuration file. Rather, all of its configuration parameters are implemented using pragmas. Pragmas work in different ways. Some are like variables; others are like commands. They cover many aspects of the database, such as runtime information, database schema, versioning, file format, memory use, and debugging. Some pragmas are read and set like variables, while others require arguments and are called like functions. Many pragmas have both temporary and permanent forms. Temporary forms affect only the current session for the duration of its lifetime. The permanent forms are stored in the database and affect every session. The cache size is one such example. This section covers the most commonly used pragmas. You can find a complete list of all SQLite pragmas.

Later in this chapter, I provide some guidelines about selecting keys (primary keys in particular).

Large transactions can sometimes run out of temporary space. Large sort jobs, especially those involving tables with many partitions, lead to heavy use of the temporary tablespaces, thus potentially leading to a performance hit. Oracle Database 10g introduces the concept of a temporary

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