获取仅包含sql查询数据的指定小数部分

Question

select * from payments where amount = 0 order by id desc

我需要获得它只有0.5部分的值。你能告诉我怎么做吗？

e.g。 12,12.5,12.6,14.5

结果数据集可以具有：12.5,14.5仅限值数据

Answer 1

将数量截断为整数，从原始值减去并与0.5

进行比较

SELECT *
FROM payments
WHERE amount - CAST(amount AS INT) = 0.5
ORDER BY id DESC

OR：

 SELECT *
 FROM payments
 WHERE amount - FLOOR(amount) = 0.5
 ORDER BY id DESC

黑客方式：

 SELECT *
 FROM payments
 WHERE PARSENAME(amount, 1)= 5
 ORDER BY id DESC

再使用modulo：

SELECT *
FROM payments
WHERE amount % 1 = 0.5
ORDER BY id DESC

Answer 2

你也可以找到这种方式

declare @temp table (val decimal(18,3))
insert into @temp values (0.5),(10.5),(20.8)

select * from @temp
where (val % 1) = 0.5

Answer 3

与接受的答案相同的想法，只是另一个想法：

SELECT *
FROM payments
WHERE FLOOR(amount) < CEILING(amount) -- or <>
ORDER BY id DESC

或

WHERE FLOOR(amount) + 1 = CEILING(amount)