AdventureWorks Database: Find the position of the string 'yellow'
59. From the following table write a SQL query to locate the position of the string "yellow" where it appears in the product name.
Sample table: production.product
productid|name |productnumber|makeflag|finishedgoodsflag|color |safetystocklevel|reorderpoint|standardcost|listprice|size|sizeunitmeasurecode|weightunitmeasurecode|weight |daystomanufacture|productline|class|style|productsubcategoryid|productmodelid|sellstartdate |sellenddate |discontinueddate|rowguid |modifieddate |
---------+--------------------------------+-------------+--------+-----------------+------------+----------------+------------+------------+---------+----+-------------------+---------------------+-------+-----------------+-----------+-----+-----+--------------------+--------------+-----------------------+-----------------------+----------------+------------------------------------+-----------------------+
1|Adjustable Race |AR-5381 |false |false | | 1000| 750| 0| 0| | | | | 0| | | | | |2008-04-30 00:00:00.000| | |694215b7-08f7-4c0d-acb1-d734ba44c0c8|2014-02-08 10:01:36.827|
2|Bearing Ball |BA-8327 |false |false | | 1000| 750| 0| 0| | | | | 0| | | | | |2008-04-30 00:00:00.000| | |58ae3c20-4f3a-4749-a7d4-d568806cc537|2014-02-08 10:01:36.827|
3|BB Ball Bearing |BE-2349 |true |false | | 800| 600| 0| 0| | | | | 1| | | | | |2008-04-30 00:00:00.000| | |9c21aed2-5bfa-4f18-bcb8-f11638dc2e4e|2014-02-08 10:01:36.827|
4|Headset Ball Bearings |BE-2908 |false |false | | 800| 600| 0| 0| | | | | 0| | | | | |2008-04-30 00:00:00.000| | |ecfed6cb-51ff-49b5-b06c-7d8ac834db8b|2014-02-08 10:01:36.827|
316|Blade |BL-2036 |true |false | | 800| 600| 0| 0| | | | | 1| | | | | |2008-04-30 00:00:00.000| | |e73e9750-603b-4131-89f5-3dd15ed5ff80|2014-02-08 10:01:36.827|
317|LL Crankarm |CA-5965 |false |false |Black | 500| 375| 0| 0| | | | | 0| |L | | | |2008-04-30 00:00:00.000| | |3c9d10b7-a6b2-4774-9963-c19dcee72fea|2014-02-08 10:01:36.827|
318|ML Crankarm |CA-6738 |false |false |Black | 500| 375| 0| 0| | | | | 0| |M | | | |2008-04-30 00:00:00.000| | |eabb9a92-fa07-4eab-8955-f0517b4a4ca7|2014-02-08 10:01:36.827|
-- more --
Sample Solution:
-- Selecting the 'name' column and the position of the substring 'Yellow' within the 'name' column as "String Position"
SELECT name, strpos(name,'Yellow') as "String Position"
-- From the Production schema's Product table
FROM production.product
-- Filtering the results to include only rows where the position of the substring 'Yellow' within the 'name' column is greater than 0
-- The strpos() function returns the position of the first occurrence of the specified substring within the specified string
-- If the substring 'Yellow' is not found within the 'name' column, strpos() returns 0
-- Therefore, the condition 'strpos(name,'Yellow')>0' ensures that only rows with 'Yellow' in the name are selected
WHERE strpos(name,'Yellow')>0;
Explanation:
- The SQL query retrieves data from the Product table within the Production schema.
- It selects two columns: name and the position of the substring 'Yellow' within the name column, aliased as "String Position".
- The WHERE clause filters the results to include only rows where:
- The position of the substring 'Yellow' within the name column (as determined by the strpos() function) is greater than 0.
- The strpos() function returns the position of the first occurrence of the specified substring within the specified string. If the substring is not found, it returns 0.
- Therefore, the condition strpos(name,'Yellow')>0 ensures that only rows where 'Yellow' is found within the name column are selected.
Sample Output:
name |String Position| -----------------------------+---------------+ Paint - Yellow | 9| Road-550-W Yellow, 38 | 12| Road-550-W Yellow, 40 | 12| Road-550-W Yellow, 42 | 12| Road-550-W Yellow, 44 | 12| Road-550-W Yellow, 48 | 12| ML Road Frame-W - Yellow, 38 | 19| ML Road Frame-W - Yellow, 40 | 19| ML Road Frame-W - Yellow, 42 | 19| ML Road Frame-W - Yellow, 44 | 19| ML Road Frame-W - Yellow, 48 | 19| ...
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