[英]Extracting multiple values from string and ordering them
我在 Notes 字段中有一些值,这些值由如下值组成,其中 abc 代表不同的词:
请求说明:VAR - abc abc abc abc abc
不幸的是,数据存储方式的设计非常糟糕,我需要为每个“Required Notes:”记录提取注释类型。 它还需要从最近到最旧的顺序(字符串的最后一部分到字符串的第一部分)。
CREATE TABLE #TestData
(
ClientID int,
Notes varchar(8000)
)
insert into #TestData
(
ClientID,
Notes
)
select
1,
'Request Notes: VAR - abc abc abc abc abc'
union all
select
2,
'Request Notes: OZR - abc abc abc abc abc Request Notes: ACC - abc abc abc abc abc Request Notes: TYU - abc abc abc abc abc'
union all
select
3,
'Request Notes: TYU - abc abc abc abc abc Request Notes: VAR - abc abc abc abc abc'
这就是我期望上述示例的输出方式:
--Expected Output
Client ID Type Order
1 VAR 1
2 TYU 1
2 ACC 2
2 OZR 3
3 VAR 1
3 TYU 2
到目前为止,我把它放在一起提取了 OZR,但我对如何获取其他列表并将列表排序到上面的预期输出中感到困惑。
DECLARE @Text varchar(500) = 'Request Notes: OZR - abc abc abc abc abc Request Notes: ACC - abc abc abc abc abc Request Notes: TYU - abc abc abc abc abc'
SELECT TRIM(REPLACE(REPLACE(SUBSTRING(@Text, CHARINDEX(':', @Text), CHARINDEX('-',@text) - CHARINDEX(':', @Text) + Len('-')),':',''),'-',''))
您可以使用openjson将数据提取为数组并进行过滤:
select d.ClientId, n.*
from #testdata d
cross apply (
select
Left(j.[value],3) [Type],
Row_Number() over(order by Convert(int,j.[key]) desc) [Order]
from OpenJson(Concat('["',replace(notes,'Notes: ', '","'),'"]')) j
where j.[value] != 'Request'
)n;
示例小提琴
这是递归 CTE 版本。 它根据查找“Request Notes:”拆分字符串,然后进行左/右组合以提取 3 个字母的代码。 它在构建时迭代顺序。 然后您从 CTE 中选择并只获取有一些 NotesRemainder 的行:
;
WITH CTESplit
AS (
SELECT ClientID,
RIGHT(LEFT(Notes, CHARINDEX('Request Notes:', Notes) + 17), 3) AS NotesPart,
RIGHT(Notes, LEN(Notes) - CHARINDEX('Request Notes:', Notes) - 17) AS NotesRemainder,
-1 AS [Order]
FROM #TestData
WHERE Notes IS NOT NULL AND CHARINDEX('Request Notes:', Notes) > 0
UNION ALL
SELECT CTESplit.ClientID,
RIGHT(LEFT(CTESplit.NotesRemainder, CHARINDEX('Request Notes:', CTESplit.NotesRemainder) + 17), 3),
RIGHT(CTESplit.NotesRemainder, LEN(CTESplit.NotesRemainder) - CHARINDEX('Request Notes:', CTESplit.NotesRemainder)),
CTESplit.[Order] - 1
FROM CTESplit
WHERE CTESplit.NotesRemainder IS NOT NULL AND CHARINDEX('Request Notes:', CTESplit.NotesRemainder) > 0
UNION ALL
SELECT CTESplit.ClientID,
RIGHT(LEFT(CTESplit.NotesRemainder, CHARINDEX('Request Notes:', CTESplit.NotesRemainder) + 17), 3),
NULL,
CTESplit.[Order] - 1
FROM CTESplit
WHERE CTESplit.NotesRemainder IS NOT NULL AND CHARINDEX('Request Notes:', CTESplit.NotesRemainder) = 0
)
SELECT CS.ClientID,
CS.NotesPart AS Type,
CS.[Order] +(SELECT MIN([Order])*-1 FROM CTESplit WHERE ClientID = CS.ClientID) AS [Order]
FROM CTESplit AS CS
WHERE CS.NotesRemainder IS NOT NULL
ORDER BY CS.ClientID,
CS.[Order] ASC;
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