[英]How can I create a SUM of one column within a query in SQL?
I have one table with multiple columns. 我有一个带有多列的表。 I am needing to create an SQL query to display certain columns based off of the user input from a datepicker and a select box. 我需要创建一个SQL查询以根据日期选择器和选择框的用户输入显示某些列。 I have done that just fine. 我做的很好。 However, I am needing one of the result columns to be totaled at the bottom of the display table. 但是,我需要将结果列之一总计在显示表的底部。 I cannot figure out how to create a result within my current query to display the totaled column. 我无法弄清楚如何在当前查询中创建结果以显示总计列。 Essentially, I would like the WTTotal column to be totaled into a separate cell. 本质上,我希望将WTTotal列总计到一个单独的单元格中。 My current query is below. 我当前的查询如下。 I really think this is something simple that I just can't seem to see. 我真的认为这很简单,我似乎看不到。
SELECT REPLACE(Client,',',' ') AS Client,WorkTicketNum,Lease,Date,OrderedBy,WTTotal
FROM WorkTicket
WHERE Date BETWEEN '2014-10-01' AND '2014-10-31' AND Invoiced IS NULL
ORDER BY Client
SELECT REPLACE(Client,',',' ') AS Client,WorkTicketNum,Lease,Date,OrderedBy,WTTotal
FROM WorkTicket
WHERE Date BETWEEN '2014-10-01' AND '2014-10-31' AND Invoiced IS NULL
ORDER BY Client
UNION ALL
SELECT 'Total', NULL, NULL, NULL, NULL, SUM(WTTotal)
FROM WorkTicket
WHERE Date BETWEEN '2014-10-01' AND '2014-10-31' AND Invoiced IS NULL;
You can't have it with a single query. 您无法通过单个查询获得它。 Putting a SUM()
into your query would require a GROUP BY
clause and collapse all of your original result rows down into a single result row - meaning your table would disappear. 将SUM()
放入查询将需要GROUP BY
子句,并将所有原始结果行折叠为单个结果行-这意味着表将消失。 What you want a is a client-side solution. 您想要的是客户端解决方案。 eg Start a counter in your client code and manually add up the results. 例如,在客户代码中启动一个计数器,然后手动将结果相加。 In pseudoish-code: 用伪代码:
$sum = 0;
while( $row = fetch_from_db() ) {
$sum += $row['field_to_sum'];
display_row();
}
echo "Total: $sum";
If you want to have it in a separate column, not in a separate row, either you calculate it in a subquery and join it to your result: 如果要在单独的列而不是单独的行中使用它,请在子查询中对其进行计算,然后将其加入结果中:
SELECT REPLACE(Client,',',' ') AS Client,WorkTicketNum,Lease,Date,OrderedBy, my_calculated_sum AS WTTotal
FROM WorkTicket
JOIN (SELECT SUM(whatever_you_want_to_sum) as my_calculated_sum FROM WorkTicket) subquery_alias
WHERE Date BETWEEN '2014-10-01' AND '2014-10-31' AND Invoiced IS NULL
ORDER BY Client
Or you just calculate it with variables, like a running total. 或者,您仅使用变量来计算它,例如运行总计。 Your result is in the last row of the column. 您的结果在该列的最后一行。
SELECT REPLACE(Client,',',' ') AS Client,WorkTicketNum,Lease,Date,OrderedBy, @sum_variable := @sum_variable + whatever_you_want_to_sum AS WTTotal
FROM WorkTicket
, (SELECT @sum_variable := 0) var_init_subquery
WHERE Date BETWEEN '2014-10-01' AND '2014-10-31' AND Invoiced IS NULL
ORDER BY Client
But actually Kevin's solution is very good. 但实际上Kevin的解决方案非常好。
I also have similar solution as Kevin's : 我也有和Kevin相似的解决方案:
;with cte_result
as
(
SELECT REPLACE(Client,',',' ') AS Client,WorkTicketNum,Lease,Date,OrderedBy,WTTotal
FROM WorkTicket
WHERE Date BETWEEN '2014-10-01' AND '2014-10-31' AND Invoiced IS NULL
)
select *
from cte_result
union
select 'TotalAmount',NULL,NULL,NULL,NULL,sum(WTTotal)
from cte_result
order by client
but this solution will work only if your DB Engine supports CTE. 但是仅当您的数据库引擎支持CTE时,此解决方案才有效。 with a CTE, we can use same resultset to get total's row. 使用CTE,我们可以使用相同的结果集来获取合计的行。
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