SQL Server CASE语句中带有子查询

Question

我在下面有case语句，但是尽管它具有应触发大小写的值，但我仍然得到null。有明显的错误吗？

SELECT 
    *,
    (CASE
        WHEN topicname = 'TPOSTAL_CODE' 
           THEN (SELECT LTRIM(RTRIM(ALS_C)) AS LocationCode
                 FROM ODS.TBUS_LOC
                 WHERE cci.columna = ods.TBUS_LOC.BUS_LOC_I)
        WHEN topicname = 'TBUSINESS_SITE' 
           THEN (SELECT LTRIM(RTRIM(B.ALS_C)) AS LocationCode
                 FROM ODS.TBUSINESS_SITE A
                 INNER JOIN ODS.TBUS_LOC B ON A.BUS_LOC_ID = B.BUS_LOC_I
                 WHERE cci.columna = A.BUS_LOC_ID)
     END) AS Code
FROM 
    [XREF].[tablea] CCI

CCIEntityName带有独特的

Answer 1

主题名称可能在开头或结尾处都包含空格。这些可能不容易被眼睛看到。您可以尝试

  

ltrim（rtrim（topicname））='TPOSTAL_CODE'的情况

看看是否有区别。