避免显式强制转换为浮动？

Question

可以

SELECT CAST(2.083 AS float) AS c

写得更紧凑？

类似于

SELECT 2.083f AS c

?

Answer 1

要避免显式 CAST 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;';