避免显式强制浮动？

Question

可以

SELECT CAST(2.083 AS float) AS c

以更紧凑的方式编写吗？

类似

SELECT 2.083f AS c

？

Answer 1

要避免将CAST显露到float，请指定floating point constant expression：

--these both return float with precision 53
EXEC sp_describe_first_result_set N'SELECT CAST(2.083 AS float) AS c;';
EXEC sp_describe_first_result_set N'SELECT 2.083E0 AS c;';

--without scientific notation, the constant is interpreted as numeric(4,3)
EXEC sp_describe_first_result_set N'SELECT 2.083 AS c;';