Question

我想把所有的行都卷成一个。我已经尝试了MAX Case，但是在这种情况下有一个非数字字符串，并且它不能用于汇总数据。我试图找到其他的例子，但不能这样，我要求你的帮助。提前致谢

我有两个具有不同数据的字段但都具有相同的控制编号，我需要将控制编号的所有数据汇总到一行。

SELECT CNTL_NUM
  ,TRANS_TYP
  ,CASE WHEN SEQ_NUM = '02' THEN SUBSTRING(TRANS_INFO,28,9) END AS 'SSN' 
  ,CASE WHEN SEQ_NUM = '11' THEN SUBSTRING(TRANS_INFO,46,2) END AS 'IPS_STATE'
  FROM LVJPROD.IPS_LNA
  WHERE TRANS_TYP = 'TA'
  GROUP BY CNTL_NUM, TRANS_TYP,SEQ_NUM,TRANS_INFO
  order by CNTL_NUM

我希望从下面的屏幕截图中将所有6条线路卷起来

Answer 1

您可以再次对它们进行分组。问题在于case语句操作数据。因此，您需要将这些视为子查询，并在外部查询中进行分组，MAX应该可以正常工作

WITH yourtable 
 AS (SELECT cntl_num, 
            trans_typ, 
            CASE 
              WHEN seq_num = '02' THEN Substring(trans_info, 28, 9) 
            END AS ssn, 
            CASE 
              WHEN seq_num = '11' THEN Substring(trans_info, 46, 2) 
            END AS ips_state 
     FROM   lvjprod.ips_lna 
     WHERE  trans_typ = 'TA' 
     GROUP  BY cntl_num, 
               trans_typ, 
               seq_num, 
               trans_info) 
SELECT cntl_num, 
       trans_typ, 
       Max(ssn), 
       Max(ips_state) 
FROM   yourtable 
GROUP  BY cntl_num, 
          trans_typ 
ORDER  BY cntl_num;

OR

SELECT cntl_num, 
       trans_typ, 
       Max(ssn), 
       Max(ips_state) 
FROM   (SELECT cntl_num, 
               trans_typ, 
               CASE 
                 WHEN seq_num = '02' THEN Substring(trans_info, 28, 9) 
               END AS ssn, 
               CASE 
                 WHEN seq_num = '11' THEN Substring(trans_info, 46, 2) 
               END AS ips_state 
        FROM   lvjprod.ips_lna 
        WHERE  trans_typ = 'TA' 
        GROUP  BY cntl_num, 
                  trans_typ, 
                  seq_num, 
                  trans_info) a 
GROUP  BY cntl_num, 
          trans_typ 
ORDER  BY cntl_num;

使用非数字时合并行上的行

1 个答案: