On Transact-SQL: Would like to create a statement that adds a column to my current active table, the newly added column would take data from another column of the same table. It will add the data on each row and sum it up on the new column.On Transact-SQL: Would like to create a stateme
阅读背景：
在Transact-SQL上：可以构建一个语句来创建一个新列，同时使用来自同一个表的另一个列的数据。
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