MSSQL Master Database Collation

What reason would you need to change the collation on a MSSQL master database?
DFPITCAsked:
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Pawan KumarDatabase ExpertCommented:
You need to rebuild / create the master databases to change the collation of the database.

From Microsoft - "When the master, model, msdb, and tempdb system databases are rebuilt, the databases are dropped and re-created in their original location. If a new collation is specified in the rebuild statement, the system databases are created using that collation setting. Any user modifications to these databases are lost. For example, you may have user-defined objects in the master database, scheduled jobs in msdb, or changes to the default database settings in the model database."

steps from -https://docs.microsoft.com/en-us/sql/relational-databases/databases/rebuild-system-databases

Collation basically used for comparison and sorting purpose. Read more from - http://www.itprotoday.com/microsoft-sql-server/seven-step-process-changing-databases-collation

Example-

CREATE TABLE A1
(
	Vals VARCHAR(20) COLLATE SQL_Latin1_General_CP850_CI_AS
)
GO

INSERT INTO A1 VALUES ( 'Pawan' )
GO

CREATE TABLE A2
(
	Vals VARCHAR(20)
)
GO

INSERT INTO A2 VALUES ( 'Pawan' )
GO

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Error
/*------------------------
SELECT * FROM A1 INNER JOIN A2 ON A1.Vals = A2.Vals
------------------------*/
Msg 468, Level 16, State 9, Line 1
Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "SQL_Latin1_General_CP850_CI_AS" in the equal to operation.

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SOLUTION 1 : Provide the Collation on the fly or change the DB's collation.
SELECT * FROM A1 INNER JOIN A2 ON A1.Vals COLLATE SQL_Latin1_General_CP1_CI_AS = A2.Vals COLLATE SQL_Latin1_General_CP1_CI_AS

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OUTPUT
/*------------------------
OUTPUT
------------------------*/
Vals                 Vals
-------------------- --------------------
Pawan                Pawan

(1 row(s) affected)

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DFPITCAuthor Commented:
This is a great comment for how to actually do it, however, that's not my question.

Why would someone ever need to do this?

When I set up a new SQL server, I need to set the collation, and I've always left it as default. Why would I need to change this?
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DFPITCAuthor Commented:
I should state, I know the reason for changing the collation on a specific db, however, why would I need to change it on the master db?

I can't think of a scenario that would require this.
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Pawan KumarDatabase ExpertCommented:
Because you wanted to change how the comparison and sorting of the characters. Another reason could u be you have match the collation with another server.
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