Function MyFunction{
    Param
    (
        [string]$S = "MyServer",
        [string]$U,
        [string]$P
    )
    # Find the SQL Engine version
    $Q = "select serverproperty('ProductVersion')"

    if($U)
    {
        $R = Invoke-Sqlcmd -ServerInstance $S -Query $Q -Username $U -Password $P -Verbose
        Write-Host "SQL Athenticated"
    }
    else
    {
        $R = Invoke-Sqlcmd -ServerInstance $S -Query $Q -Verbose
        Write-Host "Windows Athenticated"
    }
    return $R.column1
}

Invoke-Expression "$R = Invoke-Sqlcmd -ServerInstance $S -Query $Q $(if($true){""-Username $U -Password $P""})"

Function MyFunction{
    Param
    (
        [string]$S = "xps15",
        [string]$U,
        [string]$P
    )
    # Find the SQL Engine version
    $Q = "select serverproperty('ProductVersion')"
    $auth=@{}
    if($U){$auth=@{UserName=$U;Password=$P}}
    $R = Invoke-Sqlcmd -ServerInstance $S -Query $Q -Verbose @Auth
    return $R.column1
}

Function MyFunction{
    Param
    (
        [string]$S = "MyServer",
        [string]$U,
        [string]$P
    )
    # Find the SQL Engine version
    $Q = "select serverproperty('ProductVersion')"

    if($U)
    {
        $auth=@{UserName=$u;Password=$p}
        Write-Host "SQL Authenticated"
    }
    else
    {
    $auth=@{}
        Write-Host "Windows Authenticated"
    }
    $R = Invoke-Sqlcmd -ServerInstance $S -Query $Q -Verbose @Auth
    return $R.column1
}