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The readability of the query is improved if all columns are qualified with their table names. Such a SELECT clause is sometimes difficult to understand because there is nothing to indicate the table that provided each column. When a column name is not duplicated in two or more tables used in the query, references to it do not have to be qualified with the table name. All references to the Vendor columns in the example are qualified. Any column name that is duplicated between two or more tables referenced in the query must be qualified with the table name. In the previous example, both the ProductVendor and Vendor table have a column named BusinessEntityID. When multiple tables are referenced in a single query, all column references must be unambiguous. The SELECT statement returns the product and supplier information for any combination of parts supplied by a company for which the company name starts with the letter F and the price of the product is more than $10. The following is a simple SELECT statement using this join: SELECT ProductID,, NameįROM Purchasing.ProductVendor INNER JOIN Purchasing.Vendor ON ( ProductVendor.BusinessEntityID = Vendor.BusinessEntityID ) The following is an example of a FROM clause join specification: FROM Purchasing.ProductVendor INNER JOIN Purchasing.Vendor join_condition defines the predicate to be evaluated for each pair of joined rows. Join_type specifies what kind of join is performed: an inner, outer, or cross join.
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A simplified ISO FROM clause join syntax is: FROM first_table second_table Specifying the join conditions in the FROM clause helps separate them from any other search conditions that may be specified in a WHERE clause, and is the recommended method for specifying joins. 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. Outer joins and cross joins can be specified in the FROM clause only.
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Inner joins can be specified in either the FROM or WHERE clauses. Joins are expressed logically using the following Transact-SQL syntax: Specifying a logical operator (for example, = or ,) to be used in comparing values from the columns.
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A typical join condition specifies a foreign key from one table and its associated key in the other table.
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For more information on join syntax, see FROM clause plus JOIN, APPLY, PIVOT (Transact-SQL).