When building a database from an existing set of tables, we may safely assume that referential integrity constraints have been enforced on the data we are given.
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Database · all questionsDatabase Design Using Normalization
Database Design Using Normalization
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Most of the time, modification anomalies cause problems that are severe enough that a table should be normalized into BCNF.
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When building a database from an existing set of tables, we still need to consider normalization principles.
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We have normalized a table into BCNF if all candidate keys are determinants.
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We use the SQL construct COLUMNS(*) to determine the number and type of columns in a table.
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One common design problem when designing a database from existing data is the use of a single cell in one column to store multiple values of an attribute.
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In all cases, normalization into BCNF is desirable.
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Denormalized tables are in BCNF.
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We can eliminate modification anomalies with proper normalization that results in tables in BCNF.
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Proper normalization eliminates duplicated data.
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The design guidelines and priorities for read-only databases are different because read-only databases are never updated.
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The phrase "SALE.CNumber must exist in CUSTOMER.CNumber" is a referential integrity constraint.
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We use the SQL construct COUNT(*) to count the number of rows in a table.
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When you are given a set of tables and asked to create a database to store their data, the first step is to create the new database.
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Multivalued dependencies create harmless anomalies that should be noted, but do not always need to be eliminated.
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One common design problem when designing a database from existing data is the use of a general-purpose remarks column in the received data.
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One common design problem when designing a database from existing data is the presence of missing values, called blank values, in received data.
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Normalization requires programmers to write more complex SQL.
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One common design problem when designing a database from existing data is the presence of inconsistent values in the received data.
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When building a database from an existing set of tables, we may safely assume that there are no multivalued dependencies in the data we are given.
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