Question

我的值包含十进制（15,7）作为数据类型。它包含小数点后5位数。我的价值是：123.1071570。当我尝试将值转换为“varchar”时，然后在输出中得到123.107。将值转换为varchar后，我希望结果为123.107157。

我尝试过：

DECLARE @test1 decimal(15,7),
        @test2 nvarchar(10)

SELECT @test1 = 123.1071570

--Case 1 :
SELECT cast(@test1 as float) AS value1  
-- output : 123.107157  -- Value which I got after using cast()

-- I want to concate the value with string, so I need to convert it to varchar,
SELECT 'value is: '+convert(varchar,cast(@test1 as float)) AS value2     
-- output 
-- value is: 123.107  ---- Value which I got after converting it to varchar

-- Case 2 : 
SELECT convert(DOUBLE PRECISION, @test1)  AS value1  
-- output : 123.107157  -- Value which I got after using DOUBLE


SELECT 'value is: '+convert(varchar,convert(DOUBLE PRECISION, @test1)) AS value2     
-- output 
-- value is: 123.107  ---- Value which I got after converting it to varchar

我希望输出为：“值为：123.107157”

我想从我的值中删除尾随零。我的值可以是任何东西，但在使用Double的Cast（）之后，当我将它转换为varchar时，我想要从cast或Double获得相同的结果。

Answer 1

棘手的XML（从SQL Server 2008开始）：）

DECLARE @x xml

DECLARE @t TABLE (
    digit decimal(15,7)
)

INSERT INTO @t VALUES
(123.1071570),
(123.1200000),
(123.0000000)

SELECT @x = (
    SELECT digit as d
    FROM @t
    FOR XML PATH('')
)

SELECT 'Value is: '+CAST(t.c.query('. cast as xs:decimal?') as nvarchar(max))
FROM @x.nodes('/d') as t(c)

输出：

Value is: 123.107157
Value is: 123.12
Value is: 123

Answer 2

如此处所述：CAST and CONVERT (Transact-SQL)

DECLARE @myval decimal (15, 7);
SET @myval = 123.1071570;
SELECT CONVERT(decimal(15,7), CONVERT(VARCHAR(255), @myval));

正如您在评论中提到的，如果您没有固定长度，可以使用此选项：

DECLARE @myval decimal (15, 7);
SET @myval = 123.1200000 ;
SELECT CASt(CAST(CAST(@myval AS DECIMAL(15, 7)) AS FLOAT) AS NVARCHAR(255))

Answer 3

你能尝试这种方法吗？

DECLARE @myval decimal (15, 7);
SET @myval = 123.1071570;
SELECT CAST(CAST(@myval AS DECIMAL(15, 7)) AS FLOAT)

结果：123.107157

Answer 4

只需将值转换为nvarchar。

使用以下查询。

DECLARE @test1 decimal(15,7),
    @test2 nvarchar(10)

SET @test1 = 123.1071570

SELECT cast(@test1 as nvarchar(20)) AS value1

如何将十进制值转换为varchar值

4 个答案: