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Using joins

Joins connect a field in one table or view with a field of the same data type in another table or view. Joins show how the data in one table relates to the data in another table. By using joins, data from two or more tables or queries based on logical relationships among the tables can be retrieved.

A join specifies the column from each table. A typical join condition specifies a foreign key from one table and its associated key in the other table. It also specifies a logical operator (=, <>, etc.) to be used in comparing values from the columns.

Joins can be specified in either the FROM or WHERE clauses. The join conditions combine with the WHERE and HAVING search conditions to control the rows that are selected from the base tables referenced in the FROM clause.

This is a SELECT statement using the join:


Related Topics:

Performing Calculations

Filtering rows with WHERE and HAVING statements

Sorting rows

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