SQL Server 2012 Administration Powershell

Hi Experts,This below code runs well in query analyser,BUT not in powershell its giving buffer is not recognised option,Can you pls tell me the correct syntax in powershell--Thanks--
SELECT (a.cntr_value * 1.0 / b.cntr_value) * 100.0 as BufferCacheHitRatio
FROM sys.dm_os_performance_counters  a
    FROM sys.dm_os_performance_counters  
    WHERE counter_name like ('Buffer cache hit ratio base')
        AND OBJECT_NAME = 'SQLServer:Buffer Manager') b ON  a.OBJECT_NAME = b.OBJECT_NAME
    WHERE a.counter_name = 'Buffer cache hit ratio'
AND a.OBJECT_NAME = 'SQLServer:Buffer Manager'
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It might have to do with the characters in the query?  How do you do the call?
SandeepiiiDBAAuthor Commented:
Thanks for your reply.Its under the SQL agent JOB and type is powershell.
try something like this, so that you exclude special characters in powershell:

Try to see if SQL snap-ins are present:

get-pssnapin -Registered

Name        : SqlServerCmdletSnapin100
PSVersion   : 2.0
Description : This is a PowerShell snap-in that includes various SQL Server cmdlets.

Name        : SqlServerProviderSnapin100
PSVersion   : 2.0
Description : SQL Server Provider
If so

Add-PSSnapin SqlServerCmdletSnapin100 # here lives Invoke-SqlCmd
Add-PSSnapin SqlServerProviderSnapin100
then you can do something like this:

invoke-sqlcmd -inputfile "c:\mysqlfile.sql" -serverinstance "servername\serverinstance" -database "mydatabase" # the parameter -database can be omitted based on what your sql script does.

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