AdventureWorks Database: Replace string 'Supervisor' to 'Assistant' in jobtitle

SQL Query - AdventureWorks: Exercise-76 with Solution

76. From the following table write a query in SQL to create a new job title called "Production Assistant" in place of "Production Supervisor".

businessentityid|nationalidnumber|loginid                     |jobtitle                                |birthdate |maritalstatus|gender|hiredate  |salariedflag|vacationhours|sickleavehours|currentflag|rowguid                             |modifieddate           |organizationnode|
----------------+----------------+----------------------------+----------------------------------------+----------+-------------+------+----------+------------+-------------+--------------+-----------+------------------------------------+-----------------------+----------------+
               1|295847284       |adventure-works\ken0        |Chief Executive Officer                 |1969-01-29|S            |M     |2009-01-14|true        |           99|            69|true       |f01251e5-96a3-448d-981e-0f99d789110d|2014-06-30 00:00:00.000|/               |
               2|245797967       |adventure-works\terri0      |Vice President of Engineering           |1971-08-01|S            |F     |2008-01-31|true        |            1|            20|true       |45e8f437-670d-4409-93cb-f9424a40d6ee|2014-06-30 00:00:00.000|/1/             |
               3|509647174       |adventure-works\roberto0    |Engineering Manager                     |1974-11-12|M            |M     |2007-11-11|true        |            2|            21|true       |9bbbfb2c-efbb-4217-9ab7-f97689328841|2014-06-30 00:00:00.000|/1/1/           |
               4|112457891       |adventure-works\rob0        |Senior Tool Designer                    |1974-12-23|S            |M     |2007-12-05|false       |           48|            80|true       |59747955-87b8-443f-8ed4-f8ad3afdf3a9|2014-06-30 00:00:00.000|/1/1/1/         |
               5|695256908       |adventure-works\gail0       |Design Engineer                         |1952-09-27|M            |F     |2008-01-06|true        |            5|            22|true       |ec84ae09-f9b8-4a15-b4a9-6ccbab919b08|2014-06-30 00:00:00.000|/1/1/2/         |
               6|998320692       |adventure-works\jossef0     |Design Engineer                         |1959-03-11|M            |M     |2008-01-24|true        |            6|            23|true       |e39056f1-9cd5-478d-8945-14aca7fbdcdd|2014-06-30 00:00:00.000|/1/1/3/         |
               7|134969118       |adventure-works\dylan0      |Research and Development Manager        |1987-02-24|M            |M     |2009-02-08|true        |           61|            50|true       |4f46deca-ef01-41fd-9829-0adab368e431|2014-06-30 00:00:00.000|/1/1/4/         |
               8|811994146       |adventure-works\diane1      |Research and Development Engineer       |1986-06-05|S            |F     |2008-12-29|true        |           62|            51|true       |31112635-663b-4018-b4a2-a685c0bf48a4|2014-06-30 00:00:00.000|/1/1/4/1/       |
               9|658797903       |adventure-works\gigi0       |Research and Development Engineer       |1979-01-21|M            |F     |2009-01-16|true        |           63|            51|true       |50b6cdc6-7570-47ef-9570-48a64b5f2ecf|2014-06-30 00:00:00.000|/1/1/4/2/       |
              10|879342154       |adventure-works\michael6    |Research and Development Manager        |1984-11-30|M            |M     |2009-05-03|true        |           16|            64|true       |eaa43680-5571-40cb-ab1a-3bf68f04459e|2014-06-30 00:00:00.000|/1/1/4/3/       |
			  -- more --

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Sample Solution:

-- Selecting the 'jobtitle' column and replacing a portion of the job title with 'Assistant',
-- starting from the 12th character and replacing 10 characters, and aliasing the result as 'New Jobtitle'
SELECT jobtitle, overlay(jobtitle placing 'Assistant' FROM  12 for 10) as "New Jobtitle"

-- From the HumanResources schema's Employee table as e
FROM humanresources.employee e 

-- Filtering the results to include only rows where a specific portion of the job title is 'Supervisor'
WHERE SUBSTR(jobtitle, 12, 10) = 'Supervisor';

Explanation:

• The SQL query retrieves data from the Employee table within the HumanResources schema.
• It selects the 'jobtitle' column.
• The OVERLAY() function is used to replace a portion of the job title with 'Assistant'.
• The replacement starts from the 12th character of the job title and replaces 10 characters.
• The result of the replacement is aliased as 'New Jobtitle'.
• The SUBSTR() function is used to extract a substring of the job title starting from the 12th character and spanning 10 characters.
• The WHERE clause filters the results to include only rows where the extracted substring matches 'Supervisor'.

Sample Output:

jobtitle                    |New Jobtitle               |
----------------------------+---------------------------+
Production Supervisor - WC60|Production Assistant - WC60|
Production Supervisor - WC60|Production Assistant - WC60|
Production Supervisor - WC10|Production Assistant - WC10|
Production Supervisor - WC50|Production Assistant - WC50|
Production Supervisor - WC60|Production Assistant - WC60|
Production Supervisor - WC30|Production Assistant - WC30|
Production Supervisor - WC40|Production Assistant - WC40|
Production Supervisor - WC10|Production Assistant - WC10|
Production Supervisor - WC50|Production Assistant - WC50|
Production Supervisor - WC10|Production Assistant - WC10|
...

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