May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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OUTER JOIN
Outer joins are used to return all the data in one table, plus any matching rows in the other table. In the left outer join, the entire left table is returned along with any matching rows from the right table. If there is no matching row on the right, null values will be returned for these columns:
Building on the preceding example, there are some rows in the Product table that are not currently in inventory; therefore, there are no rows with these product IDs in the ProductInventory table. To return all the products, whether they have matching rows in the ProductInventory table or not, a left outer join can be used.
In this case, ...
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