Question

我目前有一个非常大的查询，我缺少一个元素......我需要将数据切割成两个小数点（不需要舍入）。我用谷歌搜索，但无法适应当前的查询。

SELECT 
    FechaDeSistema, Code, 
    CASE 
        WHEN DR_Socio = @SocioNum THEN Cantidad 
    END as Debit, 
    CASE 
        WHEN CR_Socio = @SocioNum THEN Cantidad 
    END AS Credit, 
    CASE 
        WHEN DR_Socio = @SocioNum THEN BalanceDebito 
        WHEN CR_Socio = @SocioNum THEN BalanceCredito 
    END AS Balance 
FROM 
    Ledger 
WHERE 
    (Debito_Cuenta = @Acct) OR 
    (Credito_Cuenta = @Ncct) 
ORDER BY 
    FechaDeSistema DESC

我基本上需要将信用卡和借记卡“案例”（就是你怎么说？）截断到两个小数点。我该怎么把它拉下来？提前谢谢！

Answer 1

只需将其强制转换为精度较低的十进制数，这将切断拖尾数字。

cast(yourColumnName as decimal(19,2)) as desiredColumnName

更具体地说，是您的查询代码

SELECT 
    FechaDeSistema, 
    Code, 
    CASE 
        WHEN DR_Socio = @SocioNum THEN cast(Cantidad as decimal(19,2)) 
    END as Debit, 
    CASE 
        WHEN CR_Socio = @SocioNum THEN cast(Cantidad as decimal(19,2)) 
    END AS Credit, 
    CASE 
        WHEN DR_Socio = @SocioNum THEN cast(BalanceDebito as decimal(19,2)) 
        WHEN CR_Socio = @SocioNum THEN cast(BalanceCredito as decimal(19,2)) 
    END AS Balance 
FROM Ledger 
WHERE (Debito_Cuenta = @Acct) 
OR    (Credito_Cuenta = @Ncct) 
ORDER BY FechaDeSistema DESC";

Answer 2

CASTing将会轮回。如果你真的想截断你可以使用带有截断选项的ROUND，就像这样..

DECLARE @MyNum DECIMAL(19,4) = 100.1294

SELECT @MyNum 'MyNum'
, CAST(@MyNum AS DECIMAL(19,2)) 'Cast will round'
, ROUND(@MyNum,2,4) 'Round with truncate option'
, CAST(ROUND(@MyNum,2,4) AS DECIMAL(19,2)) 'Better Truncate'

SQL Query截断为两个小数点？

2 个答案: