Questo sarebbe il mio approccio:
SELECT CAST('<x>' + REPLACE(data,'_','</x><x>') + '</x>' AS XML).value('/x[2]','int')
FROM YourTable
Per prima cosa lo trasformi in un XML e poi scegli il secondo nodo..
EDIT:Alcuni altri esempi in cui questo approccio è utile:
CROSS APPLY:puoi utilizzare questo approccio per ottenere più token contemporaneamente
DECLARE @tbl TABLE(separated VARCHAR(100));
INSERT INTO @tbl VALUES('1_23:50_Look_this_is_a_test'),('2_12:00_that''s_one_more_test'),('3_13:30_great!_It_works!');
SELECT Converted.value('/x[1]','int') AS number
,Converted.value('/x[2]','time') AS time
,Converted.value('/x[3]','varchar(max)') AS text
FROM @tbl
CROSS APPLY(SELECT CAST('<x>' + REPLACE(separated,'_','</x><x>') + '</x>' AS XML) AS Converted) AS MySeparated
--type-safe and easy:
/*
number time text
1 23:50 Look
2 12:00 that's
3 13:30 great!
*/
GO
CTE:utilizzare come parametro
DECLARE @Parameter VARCHAR(100)='1_12:30_SomeValue';
WITH MyParameters AS
(
SELECT CAST('<x>' + REPLACE(@Parameter,'_','</x><x>') + '</x>' AS XML).value('/x[1]','int') AS IntParam
,CAST('<x>' + REPLACE(@Parameter,'_','</x><x>') + '</x>' AS XML).value('/x[2]','time') AS TimeParam
,CAST('<x>' + REPLACE(@Parameter,'_','</x><x>') + '</x>' AS XML).value('/x[3]','varchar(max)') AS TextParam
)
SELECT IntParam,TimeParam,TextParam
FROM MyParameters
/*
IntParam TimeParam TextParam
1 12:30:00 SomeValue
*/
GO
Dividi stringa:trasforma in elenco
DECLARE @MyIDs VARCHAR(100)='3,5,7';
SELECT A.B.value('.','int') TheIntValue
FROM(SELECT CAST('<x>' + REPLACE(@MyIDs,',','</x><x>') + '</x>' AS XML) AS MyListAsXML) AS x
CROSS APPLY MyListAsXML.nodes('/x') AS A(B)
/*
TheIntValue
3
5
7
*/
GO
Dichiarazione dinamica IN
DECLARE @tbl TABLE(ID INT,Content VARCHAR(max));
INSERT INTO @tbl VALUES(1,'Value 1'),(2,'Value 2'),(3,'Value 3'),(4,'Value 4'),(5,'Value 5'),(6,'Value 6'),(7,'Value 7');
DECLARE @MyIDs VARCHAR(100)='3,5,7';
/*
This won't work (due to the fact, that @MyIDs is not a list of INTs but a text
SELECT * FROM @tbl WHERE ID IN(@MyIDs)
*/
WITH AsList AS
(
SELECT A.B.value('.','int') TheIntValue
FROM(SELECT CAST('<x>' + REPLACE(@MyIDs,',','</x><x>') + '</x>' AS XML) AS MyListAsXML) AS x
CROSS APPLY MyListAsXML.nodes('/x') AS A(B)
)
SELECT * FROM @tbl WHERE ID IN(SELECT TheIntValue FROM AsList)
/*
ID Content
3 Value 3
5 Value 5
7 Value 7
*/
