Disclaimer: I have already posted this question yesterday here. As there were no response there re-posting it in dba forum now.
Table Schema:
CREATE TABLE [dbo].[TblMaster](
[SID] [int] IDENTITY(1,1) NOT NULL Primary Key,
[VID] [int] NOT NULL,
[CreatedDate] [datetime] default (getdate()) NOT NULL,
[CharToAdd] [varchar](10) NULL,
[Start] [int] NOT NULL,
[End] [int] NOT NULL
)
GO
CREATE TABLE [dbo].[TblDetails](
[DetailsID] [int] IDENTITY(1,1) NOT NULL Primary Key,
[SID] [int] NOT NULL,
[Sno] [int] NOT NULL,
[ConcatenatedText] [varchar](20) NOT NULL,
[isIssued] [bit] default (0) NOT NULL,
[isUsed] [bit] default (0) NOT NULL
)
GO
Sample data:
Insert into dbo.TblMaster Values (1,default, 'CA', 1, 5)
Insert into dbo.TblMaster Values (1,default, 'PA', 1, 5)
GO
Insert into dbo.TblDetails values(1, 1, 'CA1', 0,0)
Insert into dbo.TblDetails values(1, 2, 'CA2', 0,0)
Insert into dbo.TblDetails values(1, 3, 'CA3', 0,0)
Insert into dbo.TblDetails values(1, 4, 'CA4', 1,0)
Insert into dbo.TblDetails values(1, 5, 'CA5', 0,0)
Insert into dbo.TblDetails values(2, 1, 'PA1', 0,0)
Insert into dbo.TblDetails values(2, 2, 'PA2', 0,0)
Insert into dbo.TblDetails values(2, 3, 'PA3', 1,0)
Insert into dbo.TblDetails values(2, 4, 'PA4', 0,0)
Insert into dbo.TblDetails values(2, 5, 'PA5', 0,0)
Insert into dbo.TblDetails values(3, 1, '1', 0,0)
Insert into dbo.TblDetails values(3, 2, '2', 1,0)
Insert into dbo.TblDetails values(3, 3, '3', 1,0)
Insert into dbo.TblDetails values(3, 4, '4', 0,0)
Insert into dbo.TblDetails values(3, 5, '5', 0,0)
GO
Expected Output:
Query I have build till now (result doesn't match the expected output)
Declare @VID INT = 1
;WITH Tmp as
(
SELECT
TM.CharToAdd as Prefix,
sno,
sno - ROW_NUMBER() OVER(ORDER BY sno) as grp
FROM dbo.TblDetails TD
LEFT JOIN dbo.TblMaster TM on TM.[SID] = TD.[SID]
WHERE isIssued = 0 and isUsed = 0
AND TM.VID = @VID
)
SELECT Prefix,
MIN(sno) as RangeStart,
MAX(sno) as RangeEnd,
COUNT(*) as [Count]
FROM Tmp
GROUP BY grp, Prefix
In the TblDetails table want to find the range of available values and its total counts from all records whose bit columns are 0. If bit column is 1 then it means it is already used so I am trying to skip it and list rest as available records. Doubtful whether am I explaining the problem statement well so have provided the sample data and expected output for better understanding. I did try doing some recursive function but the result isn't matching the expected output. So looking for help to resolve this.
Best Answer
You were close with what you had. Just needed a couple of changes.
You need to partition on
TM.CharToAdd
to make the counter restart for each prefix value and you need to changeAND TM.VID = @VID
toAND (TM.VID = @VID OR TM.VID IS NULL)
if you want the rows fromTblDetails
that does not have a match onSID
inTblMaster
.