AdventureWorks Database: Check for similarity of the values
SQL Query - AdventureWorks: Exercise-131 with Solution
131. From the following table write a query in SQL to check the values of MakeFlag and FinishedGoodsFlag columns and return whether they are same or not. Return ProductID, MakeFlag, FinishedGoodsFlag, and the column that are null or not null.
Sample table: production.Product
Sample Solution:
SELECT ProductID, MakeFlag, FinishedGoodsFlag,
NULLIF(MakeFlag,FinishedGoodsFlag) AS "Null if Equal"
FROM Production.Product
WHERE ProductID < 10;
Sample Output:
productid|makeflag|finishedgoodsflag|Null if Equal|
---------+--------+-----------------+-------------+
1|false |false | |
2|false |false | |
3|true |false |true |
4|false |false | |
SQL AdventureWorks Editor:
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Previous: Select data from first column that has a nonnull value.
Next: Return any distinct values that are returned by both the queries.
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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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