[英]Find matching values between two tables when using cross apply in SQL
我正在嘗試從表 A 列 x中提取 5 個或更多連續數字,並將提取的數字與表 B 列 z匹配。 如果該值存在,那很好,但如果該值不存在,則需要將其插入到Table B中。 我已經設法從表 A中提取了數字,但是在嘗試JOIN
時我被卡住了,因為我正在使用CROSS APPLY
和CASE
。 也許我只是不明白如何做到這一點。
我用來提取數字的代碼:
SELECT nvt.AdditionalInformation,
CASE
WHEN M.FirstMatch > 0
THEN SUBSTRING(AdditionalInformation, M.FirstMatch-1, N.SecondMatch-1)
--check IF TPNumber EXISTS in ChangeRequests table then add ChangeRequest Id to ReportVersionChangeRequests table
ELSE NULL
END
FROM
(
SELECT ':'+nvt.AdditionalInformation+':' AdditionalInformation
FROM dbo.NSReportVtest nvt
) nvt
CROSS APPLY(VALUES(PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', ':'+nvt.AdditionalInformation+':'))) M(FirstMatch)
CROSS APPLY(VALUES(PATINDEX('%[^0-9]%', SUBSTRING(AdditionalInformation, M.FirstMatch-1, LEN(AdditionalInformation))))) N(SecondMatch)
目前這是代碼的結果:
表 A:
附加信息 | (無列名) |
---|---|
:試驗結果: | NULL |
:試驗結果: | 256985 |
:試驗結果: | NULL |
:試驗結果: | NULL |
:試驗結果: | NULL |
:試驗結果: | 85965 |
預期成績:
表 A:
附加信息 | (無列名) |
---|---|
:試驗結果: | NULL |
:試驗結果: | 256985 |
:試驗結果: | NULL |
:試驗結果: | NULL |
:試驗結果: | NULL |
:試驗結果: | 85965 |
表 B:
ID | 數字 |
---|---|
1 | 61758 |
2 | 85965 |
3 | 56456 |
4 | 78945 |
Join
后預期的 Output
表 C:
ID | 數字 |
---|---|
1 | 61758 |
2 | 85965 |
6 | 56456 |
8 | 78945 |
9 | 256985(添加條目) |
create table NSReportVtest (AdditionalInformation nvarchar(max)) -- Source table
create table NSReportVtest2 (id int identity(1,1) ,Value int) -- destination table
insert into NSReportVtest --- creating source data
select 'aaa256985bbb'
union all select 'aasa123456babb'
union all select 'aaga245bfbb'
union all select 'abaa54123bnbb'
union all select 'aaba654987bmbb'
union all select 'aacabybb'
insert into NSReportVtest2(Value) -- creating dest data
select 123456
union all select 54123
insert into NSReportVtest2 --- inserting missing data using left join
select cast( substring(SUBSTRING(AdditionalInformation,PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', AdditionalInformation), LEN(AdditionalInformation)) ,1,PATINDEX('%[^0-9]%',SUBSTRING(AdditionalInformation,PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', AdditionalInformation), LEN(AdditionalInformation))) -1 ) as int) Value
from NSReportVtest t1
left outer join NSReportVtest2 t2
on cast( substring(SUBSTRING(AdditionalInformation,PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', AdditionalInformation), LEN(AdditionalInformation)) ,1,PATINDEX('%[^0-9]%',SUBSTRING(AdditionalInformation,PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', AdditionalInformation), LEN(AdditionalInformation))) -1 ) as int) = t2.Value
where t2.id is null
and cast( substring(SUBSTRING(AdditionalInformation,PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', AdditionalInformation), LEN(AdditionalInformation)) ,1,PATINDEX('%[^0-9]%',SUBSTRING(AdditionalInformation,PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', AdditionalInformation), LEN(AdditionalInformation))) -1 ) as int) <>0
我找到了一個可行的解決方案。 我INSERT INTO
到一個#temp
表中,然后我可以 select 特定列並將其連接到第二個表,這樣可以更輕松地管理數據。
SELECT nv.AdditionalInformation,
nv.Id,
CASE
WHEN M.FirstMatch > 0
THEN SUBSTRING(AdditionalInformation, M.FirstMatch-1, N.SecondMatch-1)
ELSE NULL
END AS ExtractedTP
INTO #temp
FROM
(
SELECT ':'+nv.AdditionalInformation+':' AdditionalInformation,
nv.Id
FROM dbo.NSReportVtest nv
) nv
CROSS APPLY(VALUES(PATINDEX('%[0-9][0-9][0-9][0-9][0-9]%', ':'+nv.AdditionalInformation+':'))) M(FirstMatch)
CROSS APPLY(VALUES(PATINDEX('%[^0-9]%', SUBSTRING(AdditionalInformation, M.FirstMatch-1, LEN(AdditionalInformation))))) N(SecondMatch);
--select and join temp table to ChangeRequests table to see which TP Numbers exist
SELECT t.Id,
t.ExtractedTP,
nrt.TPNumber,
nrt.Id
FROM #temp t
LEFT JOIN dbo.NSChangeRequestsTest nrt ON t.ExtractedTP = nrt.TPNumber
ORDER BY t.ExtractedTP DESC;
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