如何在不列出其他现有列的情况下将新列添加到MySQL表

Question

Say that we have a mysql table that has 100 columns. Now, I know that if we wanted to have a new column that has the sum of the values of two columns we could use the SUM function on the two columns after SELECT , but then I also have to list the names of the other 100 columns. Is there a way to have a table that has the 100 columns plus the SUM function without listing those columns after SELECT .

SELECT c1+c2, c1, c2, c3, c4,...,c100 FROM columns

Answer 1

您可以只使用通配符（ * ）：

SELECT *, c1 + c2 AS sum FROM columns

Answer 2

尝试：

SELECT c1+c2, t.* FROM columns t