export class DataTableGroupDemo implements OnInit {

    sales: any[];

    ngOnInit() {
        this.sales = [
            {brand: 'Apple', lastYearSale: '51%', thisYearSale: '40%', lastYearProfit: '$54,406.00', thisYearProfit: '$43,342'},
            {brand: 'Samsung', lastYearSale: '83%', thisYearSale: '96%', lastYearProfit: '$423,132', thisYearProfit: '$312,122'},
            {brand: 'Microsoft', lastYearSale: '38%', thisYearSale: '5%', lastYearProfit: '$12,321', thisYearProfit: '$8,500'},
            {brand: 'Philips', lastYearSale: '49%', thisYearSale: '22%', lastYearProfit: '$745,232', thisYearProfit: '$650,323,'},
            {brand: 'Song', lastYearSale: '17%', thisYearSale: '79%', lastYearProfit: '$643,242', thisYearProfit: '500,332'},
            {brand: 'LG', lastYearSale: '52%', thisYearSale: ' 65%', lastYearProfit: '$421,132', thisYearProfit: '$150,005'},
            {brand: 'Sharp', lastYearSale: '82%', thisYearSale: '12%', lastYearProfit: '$131,211', thisYearProfit: '$100,214'},
            {brand: 'Panasonic', lastYearSale: '44%', thisYearSale: '45%', lastYearProfit: '$66,442', thisYearProfit: '$53,322'},
            {brand: 'HTC', lastYearSale: '90%', thisYearSale: '56%', lastYearProfit: '$765,442', thisYearProfit: '$296,232'},
            {brand: 'Toshiba', lastYearSale: '75%', thisYearSale: '54%', lastYearProfit: '$21,212', thisYearProfit: '$12,533'}
        ];
    }
}

<p-dataTable [value]="sales">
    <p-headerColumnGroup>
        <p-row>
            <p-column header="Brand" rowspan="3"></p-column>
            <p-column header="Sale Rate" colspan="4"></p-column>
        </p-row>
        <p-row>
            <p-column header="Sales" colspan="2"></p-column>
            <p-column header="Profits" colspan="2"></p-column>
        </p-row>
        <p-row>
            <p-column header="Last Year"></p-column>
            <p-column header="This Year"></p-column>
            <p-column header="Last Year"></p-column>
            <p-column header="This Year"></p-column>
        </p-row>
    </p-headerColumnGroup>
    
    <p-column field="brand"></p-column>
    <p-column field="lastYearSale"></p-column>
    <p-column field="thisYearSale"></p-column>
    <p-column field="lastYearProfit"></p-column>
    <p-column field="thisYearProfit"></p-column>
    
    <p-footerColumnGroup>
        <p-row>
            <p-column footer="Totals:" colspan="3"></p-column>
            <p-column footer="$506,202"></p-column>
            <p-column footer="$531,020"></p-column>
        </p-row>
    </p-footerColumnGroup>
</p-dataTable>