将摘要行添加到表格

Question

嗨，我有一个包含4列的表格。表格如下

sampleId    totalAmount discount    netAmount
      1         120        40           80
      2         200        50           150
      3         400        100          300

现在我想要在表格底部的总计摘要行。请查看下面的图像文件。我怎么能做到这一点？

Answer 1

您可以union all

select * from tablename
union all 
select 'Totals' as sampleId,
sum(totalAmount) as totalAmount,
sum(discount) as discount,
sum(netAmount) as netAmount 
from tablename

这是一个演示

mysql> select * from test ;
+------+--------+----------+-----------+
| id   | amount | discount | net_total |
+------+--------+----------+-----------+
|    1 |    120 |       40 |        80 |
|    2 |    200 |       50 |       150 |
|    3 |    500 |      100 |       300 |
+------+--------+----------+-----------+
3 rows in set (0.00 sec)

mysql>  select * from test union all select 'Totals' as id,sum(amount) as amount,sum(discount) as discount,sum(net_total) as net_total from test ;
+--------+--------+----------+-----------+
| id     | amount | discount | net_total |
+--------+--------+----------+-----------+
| 1      |    120 |       40 |        80 |
| 2      |    200 |       50 |       150 |
| 3      |    500 |      100 |       300 |
| Totals |    820 |      190 |       530 |
+--------+--------+----------+-----------+

Answer 2

您可以使用UNION ALL，如下所示

select cast(sampleId as char(10)) as sampleId, totalAmount,discount, netAmount
from tab
union all
select 'Total', sum(totalAmount),sum(discount), sum(netAmount)
from tab

SqlFiddle演示

第1列将转换为varchar，因为您希望Total单词位于底部。 UNION中的列类型必须是相同的类型。

Answer 3

SELECT
    IFNULL(sampleId,"Total") as sampleId, SUM(totalAmount), SUM(discount), SUM(netAmount)
    FROM tablename
        GROUP BY sampleId WITH ROLLUP;

Answer 4

尝试使用group by modifiers：

select Coalesce(sampleId, 'Total') `sampleId` , sum(totalAmount),sum(discount),sum(netAmount)
from t 
group by sampleId with rollup

SQLFiddle：http://sqlfiddle.com/#!9/f1826/11

以下是ROLLUP的文档：https://dev.mysql.com/doc/refman/5.0/en/group-by-modifiers.html