internal/Get-SqlServerVersion.ps1

function Get-SqlServerVersion {
    $sqlVersionDict = @{
        13 = 2016
        11 = 2012
    }
    
    $sqlVersion = Get-ItemProperty HKLM:\SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\CurrentVersion | Select-Object -ExpandProperty "CurrentVersion"
    $sqlVersion = [int]$sqlVersion.split('.')[0]

    $currentSqlVersion = $sqlVersionDict[$sqlVersion]

    if ($null -eq $currentSqlVersion) {
        Write-DosMessage -Level 'Error' -Message 'SQL Server Version not in Dictionary'
    }

    return $currentSqlVersion
}
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