问题
I have created a CTE query, and I manage to join the CTE when the data in CTE is match with another table.
For example, this is how my CTE query result looks like:
ID NAME REG INV CUS BR
-----------------------------------------------
1 A0001 R0001 I0001 C0001 B0001
2 A0002 R0002 I0002 C0002 B0002
3 A0003 R0003 I0003 C0003 B0003
4 A0004 R0004 I0004 C0004 B0004
And this is the table I manage to join it to:
ID NAME CUS
---------------------
1 TEST1 C0001
2 TEST2 C0002
3 TEST3 C0003
4 TEST4 C0004
And this is my code to select CTE query
;WITH BaseQuery AS
(
SELECT
Id, Name, Comment,
CONVERT(XML, '<root><item>'
+ REPLACE(
REPLACE(
REPLACE(
REPLACE((SELECT Comment AS '*' FOR XML PATH('')),
'Reg:',
'</item><item type="Reg">'),
'Inv:',
'</item><item type="Inv">'),
'Cus:',
'</item><item type="Cus">'),
'Br:',
'</item><item type="Br">') + '</item></root>') CommentAsXml
FROM
GenTransaction
), Query (
SELECT
Id, Name, Comment,
Reg = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Reg"])[1]', 'VARCHAR(11)'))),
Inv = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Inv"])[1]', 'VARCHAR(11)'))),
Cus = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Cus"])[1]', 'VARCHAR(11)'))),
Br = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Br"])[1]', 'VARCHAR(11)')))
FROM
BaseQuery bq
)
select ArCustomer.Name, Query.Cus from ArCustomer left join Query on ArCustomer.Customer = Query.ArCustomer.Customer order by ArCustomer.Name
回答1:
[ 1 ] Using two CTEs (BaseQuery, Query and join between table and Query):
;WITH BaseQuery AS
(
SELECT
Id, Name, Comment,
CONVERT(XML, '<root><item>'
+ REPLACE(
REPLACE(
REPLACE(
REPLACE((SELECT Comment AS '*' FOR XML PATH('')),
'Reg:',
'</item><item type="Reg">'),
'Inv:',
'</item><item type="Inv">'),
'Cus:',
'</item><item type="Cus">'),
'Br:',
'</item><item type="Br">') + '</item></root>') CommentAsXml
FROM
GenTransaction
), Query (
SELECT
Id, Name, Comment,
Reg = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Reg"])[1]', 'VARCHAR(11)'))),
Inv = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Inv"])[1]', 'VARCHAR(11)'))),
Cus = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Cus"])[1]', 'VARCHAR(11)'))),
Br = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Br"])[1]', 'VARCHAR(11)')))
FROM
BaseQuery bq
)
SELECT ...
FROM Table1 t1 INNER/LEFT OUTER/... JOIN Query q ON ... join condition ... -- Query represents the second CTE
ORDER BY ...
[ 2 ] Second solution is based also on two CTEs (BaseQuery and Query) but instead of JOIN is using APPLY operator thus:
;WITH BaseQuery AS
(
SELECT
Id, Name, Comment,
CONVERT(XML, '<root><item>'
+ REPLACE(
REPLACE(
REPLACE(
REPLACE((SELECT Comment AS '*' FOR XML PATH('')),
'Reg:',
'</item><item type="Reg">'),
'Inv:',
'</item><item type="Inv">'),
'Cus:',
'</item><item type="Cus">'),
'Br:',
'</item><item type="Br">') + '</item></root>') CommentAsXml
FROM
GenTransaction
), Query (
SELECT
Id, Name, Comment,
Reg = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Reg"])[1]', 'VARCHAR(11)'))),
Inv = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Inv"])[1]', 'VARCHAR(11)'))),
Cus = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Cus"])[1]', 'VARCHAR(11)'))),
Br = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Br"])[1]', 'VARCHAR(11)')))
FROM
BaseQuery bq
)
SELECT ... t1.Col1 ... x.Col2 ...
FROM Table1 t1
OUTER/CROSS APPLY (
SELECT ...
FROM Query q
WHERE ... join condition ... -- Query represents the second CTE
) x
ORDER BY ...
[ 3 ] Another solution is to insert those rows (extracted from Comment column) into a temp table (#Results) and then JOIN temp (#Results) table with another table (Table1):
;WITH BaseQuery AS
(
SELECT
Id, Name, Comment,
CONVERT(XML, '<root><item>'
+ REPLACE(
REPLACE(
REPLACE(
REPLACE((SELECT Comment AS '*' FOR XML PATH('')),
'Reg:',
'</item><item type="Reg">'),
'Inv:',
'</item><item type="Inv">'),
'Cus:',
'</item><item type="Cus">'),
'Br:',
'</item><item type="Br">') + '</item></root>') CommentAsXml
FROM
GenTransaction
)
SELECT
Id, Name, Comment,
Reg = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Reg"])[1]', 'VARCHAR(11)'))),
Inv = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Inv"])[1]', 'VARCHAR(11)'))),
Cus = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Cus"])[1]', 'VARCHAR(11)'))),
Br = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Br"])[1]', 'VARCHAR(11)')))
INTO #Results
FROM
BaseQuery bq; -- ORDER BY here should be used within final query
SELECT ...
FROM Table1 t1 INNER/LEFT OUTER/... JOIN #Results r ON ... join condition build using t1./r... ...
ORDER BY ...
Id, Name, Comment
回答2:
From documentation of WITH common_table_expression (Transact-SQL)
Specifies a temporary named result set, known as a common table expression (CTE). This is derived from a simple query and defined within the execution scope of a single SELECT, INSERT, UPDATE, or DELETE statement.
Because CTE result scoped for only one statement you need to save result of SELECT query in table variable or create another CTE
With table variable
DECLARE @BaseData AS TABLE (
Id INT,
Name VARCHAR(50),
Comment VARCHAR(500),
Reg VARCHAR(11),
Inv VARCHAR(11),
Cus VARCHAR(11),
Br VARCHAR(11)
)
;WITH BaseQuery AS
(
-- your CTE
)
INSERT INTO @BaseData
SELECT Id, Name, Comment,
Reg = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Reg"])[1]','VARCHAR(11)'))),
Inv = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Inv"])[1]','VARCHAR(11)'))),
Cus = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Cus"])[1]','VARCHAR(11)'))),
Br = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Br"])[1]','VARCHAR(11)')))
FROM BaseQuery
ORDER BY Id, Name, Comment
-- Join it with another table
SELECT *
FROM AnotherTable at
INNER JOIN @BaseData bd ON bd.Id = at.SomeId
WITH another CTE
;WITH BaseQuery AS
(
-- your CTE
)
,
BaseResult AS
(
SELECT Id, Name, Comment,
Reg = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Reg"])[1]','VARCHAR(11)'))),
Inv = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Inv"])[1]','VARCHAR(11)'))),
Cus = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Cus"])[1]','VARCHAR(11)'))),
Br = LTRIM(RTRIM(bq.CommentAsXml.value('(root/item[@type="Br"])[1]','VARCHAR(11)')))
FROM BaseQuery
)
-- Join second result with another table
SELECT *
FROM AnotherTable at
INNER JOIN BaseResult br ON br.Id = at.SomeId
来源：https://stackoverflow.com/questions/45450874/how-to-join-cte-query-with-another-table-in-sql-server-2008