Question

我想在官方Teradata Express for VMware Player（使用Viewpoint的TDE 15.00.01 SLES 10 for VMware（40GB））上运行此查询：

SELECT 'MaxValue' column_name,
       COUNT("MaxValue") AS count_value,
       COUNT(DISTINCT("MaxValue")) AS count_dist_value,
       MIN("MaxValue") AS min_value,
       MAX("MaxValue") AS max_value,
       CASE WHEN max_value > 99999999999999 THEN 99999999999999
            ELSE SUM("MaxValue") END AS sum_value
FROM (SELECT TOP 100 * FROM "DBC"."IdCol") AS xy;

但是我收到了这个错误：

作为单一陈述执行。失败[2616：22003]数字溢出   在计算过程中发生经过时间= 00：00：00.115

声明1：选择声明失败。

所以我的问题是，为什么在CASE逻辑为True时评估ELSE语句？我该如何运行此查询？我想要来自未知表的COUNT，MIN，MAX，AVG，SUM等信息，我不知道列是否包含20位长数。谢谢！

Answer 1

根据DrCopyPaste的评论，解决方案是：

SELECT 'MaxValue' column_name,
       COUNT("MaxValue") AS count_value,
       COUNT(DISTINCT("MaxValue")) AS count_dist_value,
       MIN("MaxValue") AS min_value,
       MAX("MaxValue") AS max_value,
       CASE WHEN max_value > 99999999999999 THEN 99999999999999
            ELSE SUM(CAST("MaxValue" AS BIGINT)) END AS sum_value
FROM (SELECT TOP 100 * FROM "DBC"."IdCol") AS xy;

谢谢！

SQL Teradata评估顺序的情况下，否则

1 个答案: