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Dnum dnumber - PowerPoint PPT Presentation

Schema Definition, Constraints, and Queries and Views

Schema Definition, Constraints, and Queries and Views. Data Definition, Constraints, and Schema Changes. Used to CREATE, DROP, and ALTER the descriptions of the tables (relations) of a database. CREATE TABLE.

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Aggregation

Aggregation . Functions that operate on a single column of a table and return a single value. Five aggregation functions defined in SQL: COUNT returns the number of rows in a specified column. SUM returns the sum of the values in a specified column.

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838 views • 61 slides

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Dnum dnumber - PowerPoint PPT Presentation

Schema Definition, Constraints, and Queries and Views

Aggregation