拆分在Teradata 14中分隔为独立行的列

Question

任何人都可以帮我解决这个问题。在表格中，我现在有这样的数据。

如何将具有分隔符TTBFA-TTBFB-TTBFC-TTBFD的列节点拆分为4行，其他列相同。

加州地区GAXAEB 102,520,000 18.71 4 8/30/2014

加州地区TTBFA 92,160,000 23.33 3 9/13/2014

加州地区TTBFB 92,160,000 23.33 3 9/13/2014

加州地区TTBFC 92,160,000 23.33 3 9/13/2014

加州地区TTBFD 92,160,000 23.33 3 9/13/2014

列NODES的值不总是5个字符，可能如下所示

提前致谢

Answer 1

INSTR函数通常意味着你正在运行TD14 +。

还有STRTOK功能，更好地使用它而不是SUBSTRING（INSTR）。

而不是最多15个UNION ALL，你也可以交叉连接到一个带数字的表：

SELECT region_name, STRTOK(nodes, '-', i) AS x
FROM table
CROSS JOIN
 ( -- better don't use sys_calendar.CALENDAR as there are no statistics on day_of_calendar
   SELECT day_of_calendar AS i
   FROM sys_calendar.CALENDAR
   WHERE i <= 15
 ) AS dt
WHERE x IS NOT NULL 

您也可以在TD14中使用STRTOK_SPLIT_TO_TABLE：

SELECT * 
FROM table AS t1
JOIN 
(
   SELECT * 
   FROM TABLE (STRTOK_SPLIT_TO_TABLE(table.division, table.nodes, '-')
      RETURNS (division VARCHAR(30) CHARACTER SET UNICODE
              ,tokennum INTEGER
              ,token VARCHAR(30) CHARACTER SET UNICODE)
              ) AS dt
 ) AS t2
ON t1.division = t2.division

希望这是用于数据清理而不是日常使用......

Answer 2

你可以使用（无论你的最大节点数是多少）UNION ALL语句和SUBSTRING与INSTR一起用于节点的可能位置

尝试类似：

        SELECT region_name, nodes AS node, 
               sgspeed, sgutil, portCount, WeekendingDate
        FROM t
        WHERE instr(nodes,'-') = 0
        UNION ALL
        SELECT region_name, SUBSTRING(nodes  FROM instr(nodes,'-',1,1) +1 FOR instr(nodes,'-',1,2)-1) AS node, 
               sgspeed, sgutil, portCount, WeekendingDate
        FROM t
        WHERE instr(nodes,'-') > 0
        UNION ALL
        SELECT region_name, SUBSTRING(nodes  FROM instr(nodes,'-',1,2) +1 FOR instr(nodes,'-',1,3)-1) AS node, 
               sgspeed, sgutil, portCount, WeekendingDate
        FROM t
        WHERE instr(nodes,'-',1,2) > 0
        UNION ALL
        SELECT region_name, SUBSTRING(nodes  FROM instr(nodes,'-',1,3) +1 FOR instr(nodes,'-',1,4)-1) AS node, 
               sgspeed, sgutil, portCount, WeekendingDate
        FROM t
        WHERE instr(nodes,'-',1,3) > 0
    ... 

Answer 3

这很好。

select  
REGION_NAME,
case when POSITION('-' IN Nodes) = 0  then NODES else SUBSTRING(Nodes,0,POSITION('-' IN Nodes)) end as node, 
SgSpeed, 
SgUtil,
PortCount, 
WeekEndingDate 
FROM table

UNION 

select
REGION_NAME,
SUBSTRING(nodes  FROM instr(nodes,'-',1,1)+1 for instr(nodes,'-',1,1)-1) AS node, 
SgSpeed, 
SgUtil,
PortCount, 
WeekEndingDate
FROM table
WHERE instr(nodes,'-') > 0

UNION

select
REGION_NAME,
SUBSTRING(nodes  FROM instr(nodes,'-',1,2)+1 for instr(nodes,'-',1,1)-1) AS node, 
SgSpeed, 
SgUtil,
PortCount, 
WeekEndingDate
FROM table
WHERE instr(nodes,'-') > 0

UNION

select
REGION_NAME,
SUBSTRING(nodes  FROM instr(nodes,'-',1,3)+1 for instr(nodes,'-',1,1)-1) AS node, 
SgSpeed, 
SgUtil,
PortCount, 
WeekEndingDate 
FROM table
WHERE instr(nodes,'-') > 0