仅为 teradata 中的某些数据部分保留值
Retain values only for certain section of data in teradata
下面是我上一个问题的link。
它按照社区成员之一@Dnoeth 的建议工作。是否可以仅针对特定部分数据进行此保留?
即,仅保留 Dep 为 A 或 B 的数据。当 Dep 为 C 时,只需使用与输入相同的值,无需保留到特定值。
Data:
Cust_id Balance st_ts Dep
123 1000 27MAY2018 A
123 350 31MAY2018 A
256 2000 29MAY2018 B
345 1000 28APR2018 C
345 1200 26MAY2018 C
输出要求:
Cust_id Balance st_ts Dep
123 1000 27MAY2018 A
123 1000 28MAY2018 A
123 1000 29MAY2018 A
123 1000 30MAY2018 A
123 350 31MAY2018 A
256 2000 29MAY2018 B
256 2000 30MAY2018 B
256 2000 31MAY2018 B
345 1000 28APR2018 C
345 1200 26MAY2018 C
使用的查询:
Wth cte
{
SELECT customer_id, bal, st_ts,
-- return the next row's date
Coalesce(Min(st_ts)
Over (PARTITION BY customer_id
ORDER BY st_ts
ROWS BETWEEN 1 Following AND 1 Following)
,Date '2018-06-01') AS next_Txn_dt
FROM BAL_DET;
}
SELECT customer_id, bal
,Last(pd) -- last day of the period
FROM cTE
-- make a period of the current and next row's date
-- and return one row per day
EXPAND ON PERIOD(ST_TS, next_Txn_dt) AS pd;
谢谢
桑迪
您可以添加一个 CASE 来检查 Dep = 'C'
:
WITH cte AS
( SELECT customer_id, bal, st_ts, dep,
-- return the next row's date
CASE
WHEN dep = 'C'
THEN st_ts +1 -- simply increase date
ELSE
Coalesce(Min(st_ts)
Over (PARTITION BY customer_id
ORDER BY st_ts
ROWS BETWEEN 1 Following AND 1 Following)
,DATE '2018-06-01')
END AS next_Txn_dt
FROM BAL_DET
)
SELECT customer_id, bal
,Last(pd) -- last day of the period
,dep
FROM cTE
-- make a period of the current and next row's date
-- and return one row per day
EXPAND ON PERIOD(ST_TS, next_Txn_dt) AS pd
下面是我上一个问题的link。
它按照社区成员之一@Dnoeth 的建议工作。是否可以仅针对特定部分数据进行此保留?
即,仅保留 Dep 为 A 或 B 的数据。当 Dep 为 C 时,只需使用与输入相同的值,无需保留到特定值。
Data:
Cust_id Balance st_ts Dep
123 1000 27MAY2018 A
123 350 31MAY2018 A
256 2000 29MAY2018 B
345 1000 28APR2018 C
345 1200 26MAY2018 C
输出要求:
Cust_id Balance st_ts Dep
123 1000 27MAY2018 A
123 1000 28MAY2018 A
123 1000 29MAY2018 A
123 1000 30MAY2018 A
123 350 31MAY2018 A
256 2000 29MAY2018 B
256 2000 30MAY2018 B
256 2000 31MAY2018 B
345 1000 28APR2018 C
345 1200 26MAY2018 C
使用的查询:
Wth cte
{
SELECT customer_id, bal, st_ts,
-- return the next row's date
Coalesce(Min(st_ts)
Over (PARTITION BY customer_id
ORDER BY st_ts
ROWS BETWEEN 1 Following AND 1 Following)
,Date '2018-06-01') AS next_Txn_dt
FROM BAL_DET;
}
SELECT customer_id, bal
,Last(pd) -- last day of the period
FROM cTE
-- make a period of the current and next row's date
-- and return one row per day
EXPAND ON PERIOD(ST_TS, next_Txn_dt) AS pd;
谢谢 桑迪
您可以添加一个 CASE 来检查 Dep = 'C'
:
WITH cte AS
( SELECT customer_id, bal, st_ts, dep,
-- return the next row's date
CASE
WHEN dep = 'C'
THEN st_ts +1 -- simply increase date
ELSE
Coalesce(Min(st_ts)
Over (PARTITION BY customer_id
ORDER BY st_ts
ROWS BETWEEN 1 Following AND 1 Following)
,DATE '2018-06-01')
END AS next_Txn_dt
FROM BAL_DET
)
SELECT customer_id, bal
,Last(pd) -- last day of the period
,dep
FROM cTE
-- make a period of the current and next row's date
-- and return one row per day
EXPAND ON PERIOD(ST_TS, next_Txn_dt) AS pd