Question

如何在SQL列中添加值？我在xampp中设置了表格，我正在尝试将标题为“粗略”的列中的所有值相加。

Answer 1

SQL Server或MySQL：

select sum(MyColumn) as MyColumnSum from MyTable

如果您需要按照其他列的分组对列进行总结

select sum(MyColumn) as MyColumnSum, OtherColumn from MyTable Group By OtherColumn

这是一种单独添加负数或正数的方法

select
  sum( case when MyColumn < 0 then MyColumn else 0 end ) as NegativeSum,
  sum( case when MyColumn > 0 then MyColumn else 0 end ) as PositiveSum
from
  MyTable

<强>参考

MySQL Reference for SUM()

Answer 2

select sum(yourCol) as Gross
from YourTable

使用聚合函数SUM（）。

Answer 3

查看SUM() function documentation for MySQL。

SELECT    YourRecordID,
          SUM(Gross) AS GrossSum
FROM      YourTable
GROUP BY  YourRecordID

SQL-在列中添加值

3 个答案: