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Split String into rows but keep associated data

Time:10-06

I'm not real familiar with Split_String and my searches aren't turning up anything that I can figure out for my case.

What I need to do is split a field into rows each time its delimited but then for each new row created, copy the associated columns with that field to those new rows.

How data will start:

Name TimeStamp StudentIds Category ReportName
Teacher Report Run 2021-08-31 20:24:52.5430000 111111 Teacher Reports Report 1
Teacher Report Run 2021-08-30 1:01:22.1250000 222222,333333,444444 Teacher Reports Report 2

What I need:

Name TimeStamp StudentIds Category ReportName
Teacher Report Run 2021-08-31 20:24:52.5430000 111111 Teacher Reports Report 1
Teacher Report Run 2021-08-30 1:01:22.1250000 222222 Teacher Reports Report 2
Teacher Report Run 2021-08-30 1:01:22.1250000 333333 Teacher Reports Report 2
Teacher Report Run 2021-08-30 1:01:22.1250000 444444 Teacher Reports Report 2

I was thinking Split_String but again, this is one area I haven't had to do much of yet so I'm very green. That time has come to an end.

CodePudding user response:

Here's how you would do it using STRING_SPLIT and CROSS APPLY. Keep in mind that STRING_SPLIT does not guarantee row ordering in the results.

DROP TABLE IF EXISTS #t1;
CREATE TABLE #t1(
  [Name] VARCHAR(MAX),
  [TimeStamp] VARCHAR(MAX),
  [StudentIds] VARCHAR(MAX),
  [Category] VARCHAR(MAX),
  [ReportName] VARCHAR(MAX)
)
GO

INSERT INTO #t1 ([Name],[TimeStamp],[StudentIds],[Category],[ReportName])
SELECT 'Teacher Report Run', '2021-08-31 20:24:52.5430000', '111111', 'Teacher Reports', 'Report 1' UNION ALL
SELECT 'Teacher Report Run', '2021-08-30 1:01:22.1250000', '222222,333333,444444', 'Teacher Reports', 'Report 2'

SELECT #t1.Name, #t1.TimeStamp, sids.value StudentIds, #t1.Category, #t1.ReportName
FROM #t1
CROSS APPLY STRING_SPLIT(StudentIds, ',')  sids
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