AdventureWorks Database: Evaluate whether the values in two columns are the same
SQL Query - AdventureWorks: Exercise-129 with Solution
129. From the following table write a query in SQL to evaluate whether the values in the MakeFlag and FinishedGoodsFlag columns are the same.
Sample table: production.Product
Sample Solution:
SELECT ProductID, MakeFlag, FinishedGoodsFlag,
CASE
WHEN MakeFlag = FinishedGoodsFlag THEN NULL
ELSE MakeFlag
END
FROM Production.Product
WHERE ProductID < 10;
Sample Output:
productid|makeflag|finishedgoodsflag|makeflag|
---------+--------+-----------------+--------+
1|false |false | |
2|false |false | |
3|true |false |true |
4|false |false | |
SQL AdventureWorks Editor:
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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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