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"LEFT OUTER JOIN ... ON" - Writing Queries with Left Outer Joins in SQL Server
How To Write a Query with a Left Outer Join in SQL Server?
✍: FYIcenter.com
If you want to query from two tables with a left outer join, you can use the LEFT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a left outer join from two tables: fyi_links and fyi_rates. The join condition is that the id in the fyi_links table equals to the id in the fyi_rates table:
SELECT l.id, l.url, r.comment FROM fyi_links l LEFT OUTER JOIN fyi_rates r ON l.id = r.id GO id url comment 101 dev.fyicenter.com The best 102 dba.fyicenter.com Well done 103 sqa.fyicenter.com Thumbs up 104 www.mysql.com NULL 105 www.oracle.com NULL 106 www.php.net NULL 107 www.winrunner.com NULL
Note that a left outer join may return extra rows from the first (left) table that do not satisfy the join condition. In those extra rows, columns from the second (right) table will be given null values.
The extra rows returned from the left outer join in this example represents links that have no rates in the above example.
⇒ "RIGHT OUTER JOIN ... ON" - Writing Queries with Right Outer Joins in SQL Server
⇐ Defining and Using Table Alias Names in SQL Server
⇑ Using SELECT Statements with Joins and Subqueries in SQL Server
2016-10-30, 2004🔥, 0💬
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