db2 - SQL/DB2 将行连接成一个字段 (DB​​2)

Question

尝试将表中的值与内部连接连接起来，这可能吗，附上示例代码。

如果我删除 CM.CMCSNM 列，代码将起作用

SELECT trim(CM.CMCSNM), CALLLOGP.CHSTKY, 
SUBSTR(xmlserialize(xmlagg(xmltext(CONCAT( ', ',CALLLOGP.CHORD#))) as 
VARCHAR(1024)), 3) AS Batches
FROM LS3DTA100A.CALLLOGP CALLLOGP inner join LS3DTA100A.CM CM on 
CM.CMSTKY=CALLLOGP.CHSTKY 
WHERE (CALLLOGP.CHOPENBY<>'') 
AND (CALLLOGP.CHCLOSDT=0) 
AND (CALLLOGP.CHACKNDT=0) 
AND (CALLLOGP.CHUPDATE=0) 
AND (CALLLOGP.CHCOMMENTS Like '%FRAME OOS%') 
AND (CALLLOGP.CHSTKY Like '00%') 
GROUP BY CALLLOGP.CHSTKY

错误消息是 SQL 错误 [42803]：[SQL0122] 列 CMCSNM 或 SELECT 列表中的表达式无效。

Answer 1

SQL0122N  A SELECT statement with no GROUP BY clause contains a column
      name or expression and a column function in the SELECT clause, or
      a column name or expression is contained in the SELECT clause but
      not in the GROUP BY clause.

您需要将 trim(CM.CMCSNM) 作为 GROUP BY 的一部分。例如：

GROUP BY trim(CM.CMCSNM), CALLLOGP.CHSTKY