AdventureWorks Database: Order the result set by the column TerritoryName using CASE
SQL Query - AdventureWorks: Exercise-124 with Solution
124. From the following table write a query in SQL to order the result set by the column TerritoryName when the column CountryRegionName is equal to 'United States' and by CountryRegionName for all other rows. Return BusinessEntityID, LastName, TerritoryName, CountryRegionName.
Sample table: Sales.vSalesPerson
Sample Solution:
SELECT BusinessEntityID, LastName, TerritoryName, CountryRegionName
FROM Sales.vSalesPerson
WHERE TerritoryName IS NOT NULL
ORDER BY CASE CountryRegionName WHEN 'United States' THEN TerritoryName
ELSE CountryRegionName END;
Sample Output:
businessentityid|lastname |territoryname |countryregionname|
----------------+-----------------+--------------+-----------------+
286|Tsoflias |Australia |Australia |
282|Saraiva |Canada |Canada |
278|Vargas |Canada |Canada |
277|Carson |Central |United States |
290|Varkey Chudukatil|France |France |
288|Valdez |Germany |Germany |
275|Blythe |Northeast |United States |
280|Ansman-Wolfe |Northwest |United States |
284|Mensa-Annan |Northwest |United States |
283|Campbell |Northwest |United States |
279|Reiter |Southeast |United States |
276|Mitchell |Southwest |United States |
281|Ito |Southwest |United States |
289|Pak |United Kingdom|United Kingdom |
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SQL: Tips of the Day
Difference between natural join and inner join
One significant difference between INNER JOIN and NATURAL JOIN is the number of columns returned-
Consider:
TableA TableB +------------+----------+ +--------------------+ |Column1 | Column2 | |Column1 | Column3 | +-----------------------+ +--------------------+ | 1 | 2 | | 1 | 3 | +------------+----------+ +---------+----------+
The INNER JOIN of TableA and TableB on Column1 will return
SELECT * FROM TableA AS a INNER JOIN TableB AS b USING (Column1); SELECT * FROM TableA AS a INNER JOIN TableB AS b ON a.Column1 = b.Column1;
+------------+-----------+---------------------+ | a.Column1 | a.Column2 | b.Column1| b.Column3| +------------------------+---------------------+ | 1 | 2 | 1 | 3 | +------------+-----------+----------+----------+
The NATURAL JOIN of TableA and TableB on Column1 will return:
SELECT * FROM TableA NATURAL JOIN TableB +------------+----------+----------+ |Column1 | Column2 | Column3 | +-----------------------+----------+ | 1 | 2 | 3 | +------------+----------+----------+
Ref: https://bit.ly/3AG5CId
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