在SQL Server中将2个别名相乘

Question

我有一个使用no FROM子句创建SELECT STATEMENT的赋值。 我正在尝试将Price和TaxRate相乘以生成TaxAmount列，但我收到错误，指出Price和TaxRate的列名无效。

SELECT '100 (dollars)' AS Price, '.07 (7 percent)' AS TaxRate,
Price * TaxRate AS TaxAmount, TaxAmount + Price AS Total

Answer 1

SELECT 100 AS Price, .07 AS TaxRate, (100 * .07) AS TaxAmount, ((100 * .07) + 100) AS Total

你不需要让它看起来像100（美元），我不认为，这是没有意义的。如果你真的这样做，你可以使用

SELECT '100 (dollars)' AS Price, '.07 (7 percent)' AS TaxRate, (100 * .07) AS TaxAmount, ((100 * .07) + 100) AS Total