sql - Syntax error using LEN() with varchar -

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can advise correct syntax below.

@test len(right(@test, charindex('/',@test) 1)1)  + ' ' + left(@test, charindex('/',@test) 1)  + ' ' +invoice_booking.dptr_date +  ' ' + invoice_booking_detail.destination_name [as] description

i added len() want limit first result 1 character

i have declared @test 

declare @test nvarchar(100) set @test = invoice_booking_detail.principal_passenger

cheers

dave

wrong syntax near len(),left(),right() 

@test len(right(@test, charindex('/',@test)))  + ' ' + left(@test, charindex('/',@test))  + ' ' +invoice_booking.dptr_date +  ' ' + invoice_booking_detail.destination_name [as] description

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