Substring a URL to the 5th slash - sql

Question

Could you help me sub-string a list of different URLs?
I can only understand how to sub-string a part of it, but could not manage to make it as requested - which is I need the URL to be full to the 5th slash (bold section), but some of the URLs don't have the 5th slash.
Example URLs:
'http://db-hit-internet/bags/personnel/default.axxxx'
'http://db-hit-internet/store/books/preview/default.axxxx'
'http://db-git-internet/friends/default.aspx?lang=LTT'
Expected output:
'http://db-hit-internet/bags/personnel'
'http://db-hit-internet/store/books/preview'
'http://db-git-internet/friends/default.aspx?lang=LTT'
I have query:
SELECT ('CS' + cast([id] as char (4))) AS name, [SysName], [Link], COUNT(*) AS Viewed
FROM main AS A
INNER JOIN
(
SELECT [LogDate], [LogPage] COLLATE Latin1_General_CI_AS PageName
FROM web
UNION
SELECT [LogDate], [LogPage] PageName
FROM web2
)
ON A.Link= PageName
WHERE A.[Link] is not null
GROUP BY A.id, A.[SysName], A.[Link]
And I need the web and web2 union to have the URLs sub-stringed to the 5th slash. The problem is that there should be a CASE statement to check if the 5th slash exists and then according to that SUBSTRING and CHARINDEX should be included somewhere.
I tried:
LEFT([LogPage], CHARINDEX('/', [LogPage], CHARINDEX('/', [LogPage], CHARINDEX('/', [LogPage], CHARINDEX('//', [LogPage])+2)+1)+1))
But it only works with the URLs that have the 5th slash.

Answer 1

You can also use CROSS APPLY.
SELECT URL,SUBSTRING(URL,1,CASE WHEN (TS.LOC!=0 AND FRS.LOC!=0 AND FVS.LOC!=0) THEN FVS.LOC
ELSE LEN(URL) END) SUBURL
FROM TEST
CROSS APPLY (VALUES(CHARINDEX('/',URL))) FS(LOC)
CROSS APPLY (VALUES(CHARINDEX('/',URL,FS.LOC+1))) SS(LOC)
CROSS APPLY (VALUES(CHARINDEX('/',URL,SS.LOC+1))) TS(LOC)
CROSS APPLY (VALUES(CHARINDEX('/',URL,TS.LOC+1))) FRS(LOC)
CROSS APPLY (VALUES(CHARINDEX('/',URL,FRS.LOC+1))) FVS(LOC)
Check Demo Here
Note : Please change the CASE conditions accordingly (Assumption: 2 slashes will always be there). This will give sub string till 5th slash.

Answer 2

One option is a JSON-based approach, which transforms the data into a valid JSON and parses this JSON with OPENJSON():
Table:
CREATE TABLE Data (url varchar(100))
INSERT INTO Data (url)
VALUES
('http://db-hit-internet/bags/personnel/default.axxxx'),
('http://db-hit-internet/store/books/preview/default.axxxx'),
('http://db-git-internet/friends/default.aspx?lang=LTT'),
('http://db-git-internet.net')
Statement:
SELECT CONCAT(j.part1, j.part2, j.part3, j.part4, j.part5) AS url
FROM Data d
CROSS APPLY OPENJSON(CONCAT('[["', REPLACE(STRING_ESCAPE(d.url, 'json'), '/', '/","'), '"]]')) WITH (
part1 varchar(100) '$[0]',
part2 varchar(100) '$[1]',
part3 varchar(100) '$[2]',
part4 varchar(100) '$[3]',
part5 varchar(100) '$[4]'
) j
Result:
url url
http://db-hit-internet/bags/personnel/default.axxxx http://db-hit-internet/bags/personnel/
http://db-hit-internet/store/books/preview/default.axxxx http://db-hit-internet/store/books/
http://db-git-internet/friends/default.aspx?lang=LTT http://db-git-internet/friends/default.aspx?lang=LTT
http://db-git-internet.net http://db-git-internet.net
If you want a string-based approach, the following statement is a possible solution:
SELECT d.url, LEFT(d.url, v5.pos)
FROM Data d
CROSS APPLY (SELECT CASE WHEN CHARINDEX('/', d.url, 1) = 0 THEN LEN(d.url) ELSE CHARINDEX('/', d.url, 1) END) v1 (pos)
CROSS APPLY (SELECT CASE WHEN CHARINDEX('/', d.url, v1.pos + 1) = 0 THEN LEN(d.url) ELSE CHARINDEX('/', d.url, v1.pos + 1) END) v2 (pos)
CROSS APPLY (SELECT CASE WHEN CHARINDEX('/', d.url, v2.pos + 1) = 0 THEN LEN(d.url) ELSE CHARINDEX('/', d.url, v2.pos + 1) END) v3 (pos)
CROSS APPLY (SELECT CASE WHEN CHARINDEX('/', d.url, v3.pos + 1) = 0 THEN LEN(d.url) ELSE CHARINDEX('/', d.url, v3.pos + 1) END) v4 (pos)
CROSS APPLY (SELECT CASE WHEN CHARINDEX('/', d.url, v4.pos + 1) = 0 THEN LEN(d.url) ELSE CHARINDEX('/', d.url, v4.pos + 1) END) v5 (pos)