Question

为什么我在这个输出中得到Integer（我期待DECIMAL）数据库风味是Teradata 我做错了什么？

CASE WHEN sub_e.LSD IS NOT NULL  THEN CAST(baba.amt AS DECIMAL(10,2))  
ELSE 0
END
-
(
SUM(
     CASE 

        WHEN sub_e.LSD IS NOT NULL          
        THEN ch.actv_amt  * (1 + ch.tax_percent_rate/100) 

     ELSE 0

     END
    )
)
 +
 CASE WHEN  
                sub_e.LSD IS NOT NULL THEN COALESCE(sub_e.PWC, 0)
 ELSE 0
 END                

  AS ODTS,

Answer 1

如果TAX_RATE_PERCENT未定义为 足够精确度的DECIMAL ，那么(1 + TAX_RATE_PERCENT/100)的计算将不正确。< / p>

SELECT 6/100; -- 0 (zero - Integer division)

SELECT 6.0/100; -- 0.1 (rounding rules based on precision of numerator)

SELECT 6.00/100; -- 0.06 (expected answer)

SELECT CAST(6 AS DECIMAL(2,1))/100; -- 0.1 (rounding rules based on precision of numerator)

SELECT CAST(6 AS DECIMAL(3,2))/100; -- 0.06 (expected answer)

有关Teradata中DECIMAL数据类型行为的更多详细信息，请参阅Dnoeth的解释here。

Answer 2

问题出在表格内部列的定义中，上面的查询结果是INSERT

整数而不是DECIMAL

2 个答案: