通过使用LPAD 3次，Teradata 98​​04响应行大小或常量行大小溢出错误

Question

以下代码给出了＆＃9; 9804响应行大小或常量行大小溢出错误＆＃39;添加LPAD功能后出错。如果我删除LPAD功能它运行正常。

使用ODBC ASCII连接查询与2 LPAD函数一起正常工作。具有3个LPAD功能，其投掷错误。

任何人都可以建议如何解决它。

SELECT 
 CAST(TableA.A AS VARCHAR(50)) AS A 
,LPAD(CAST(CAST(TableA.B AS DECIMAL(18,2) FORMAT '-9999999999999999.9(2)' ) AS VARCHAR(20)),20,' ') AS B
,LPAD(CAST(CAST(TableA.C AS DECIMAL(18,2) FORMAT '-9999999999999999.9(2)' ) AS VARCHAR(20)),20,' ') AS C
,CAST(CAST(TableA.D AS INTEGER FORMAT '9999999999') AS VARCHAR(10)) AS D
,CAST(CAST(TableA.E AS INTEGER FORMAT '9999999999') AS VARCHAR(10))  AS E
,CAST(CAST(TableA.F AS INTEGER FORMAT '9999999999') AS VARCHAR(10))  AS F
,CAST(CAST(TableA.G AS INTEGER FORMAT '9999999999') AS VARCHAR(10))  AS G
,CAST(CAST(TableA.H AS INTEGER FORMAT '9999999999') AS VARCHAR(10))  AS H
,LPAD(CAST(CAST(TableA.I AS DECIMAL(18,2) FORMAT '-9999999999999999.9(2)' ) AS VARCHAR(20)),20,' ') AS I
,CAST(CAST(TableA.J AS SMALLINT FORMAT '99999') AS VARCHAR(10)) AS J
,CAST(CAST(TableA.K AS SMALLINT FORMAT '99999') AS VARCHAR(10)) AS K

FROM TableA AS TableA

Answer 1

检查LPAD的结果数据类型时，它类似于VarChar（32000）。当你得到多个LPAD时，这超过了最大行长度64k。

您可以添加另一个类型转换以减少计算的大小：

,CAST(LPAD(CAST(CAST(TableA.B AS DECIMAL(18,2) FORMAT '-9999999999999999.9(2)' ) AS VARCHAR(20)),20,' ') AS VARCHAR(20)) AS B

FORMAT指定一个前导空格，但是CAST到VarChar会删除它。 您可以切换到Teradata样式转换，格式为右对齐而左对齐ANSI转换。

Cast(B AS DECIMAL(18,2) Format '-9999999999999999.9(2)' ) ( VARCHAR(20)) -- or better (CHAR(20))

或者您只需切换到TO_CHAR：

To_Char(b, '09999999999999999.99')