Take next N rows recursively and sequentially from sql table - sql-server-2008-r2

Question

I have two tables "main" and "moved". "main" table has records from where I move 3 rows sequentially to "moved" table by executing a stored procedure. So every time I execute the stored procedure it should check to see the next set of 3 rows are sequentially read from "main" table from the row of last move happened and inserted into "moved" table.
select rowid from #main
rowid
-----------------------
1
2
3
4
5
Now when I execute the query, it should take the 3 rows from "main" table and insert into "moved" table. Say if I run the query 5 times, this is how I expect the "moved" table to contain each time I run it.
1,2,3 --"moved" table has these rows 1st time when I run the query
4,5,1 --"moved" table has these rows 2nd time when I run the query
2,3,4 --"moved" table has these rows 3rd time when I run the query
5,1,2 --"moved" table has these rows 4th time when I run the query
3,4,5 --"moved" table has these rows 5th time when I run the query
1,2,3 --"moved" table has these rows 6th time when I run the query
...so the sequential read continues. Read sequentially from next row where it ended from last run.
I asked this already, but the answer works only partially. It doesn't work when the values in the "main" table grows or not in order.
Thanks in advance for your help.

Answer 1

The following example may give you a starting point. Note that there must be an explicit order provided for the values that you want to insert. A table has no natural order and "sequential" is meaningless.
-- Sample data.
declare #Template as Table ( TemplateValue VarChar(10), TemplateRank Int );
-- NB: TemplateRank values are assumed to start at zero and be dense.
insert into #Template ( TemplateValue, TemplateRank ) values
( 'one', 0 ), ( 'two', 1 ), ( 'three', 2 ), ( 'four', 3 );
declare #NumberOfTemplateValues Int = ( select Max( TemplateRank ) from #Template ) + 1;
select * from #Template;
declare #AccumulatedStuff as Table ( Id Int Identity, Value VarChar(10) );
declare #GroupSize as Int = 5;
-- Add a block of GroupSize rows to the AccumulatedStuff .
declare #LastValue as VarChar(10) = ( select top 1 Value from #AccumulatedStuff order by Id desc );
declare #LastRank as Int = ( select TemplateRank from #Template where TemplateValue = #LastValue );
select #LastValue as LastValue, #LastRank as LastRank;
with Numbers as (
select 1 as Number
union all
select Number + 1
from Numbers
where Number < #GroupSize ),
RankedValues as (
select TemplateValue, TemplateRank
from #Template as T inner join
Numbers as N on ( N.Number + Coalesce( #LastRank, #NumberOfTemplateValues - 1 ) ) % #NumberOfTemplateValues = T.TemplateRank )
insert into #AccumulatedStuff
select TemplateValue from RankedValues;
select * from #AccumulatedStuff;
-- Repeat.
set #LastValue = ( select top 1 Value from #AccumulatedStuff order by Id desc );
set #LastRank = ( select TemplateRank from #Template where TemplateValue = #LastValue );
select #LastValue as LastValue, #LastRank as LastRank;
with Numbers as (
select 1 as Number
union all
select Number + 1
from Numbers
where Number < #GroupSize ),
RankedValues as (
select TemplateValue, TemplateRank
from #Template as T inner join
Numbers as N on ( N.Number + Coalesce( #LastRank, #NumberOfTemplateValues - 1 ) ) % #NumberOfTemplateValues = T.TemplateRank )
insert into #AccumulatedStuff
select TemplateValue from RankedValues;
select * from #AccumulatedStuff;

Answer 2

DECLARE #main TABLE
(
RowID INT IDENTITY(1,1),
DataID INT
)
DECLARE #selected TABLE
(
RowID INT IDENTITY(1,1),
DataID INT
)
DECLARE #final TABLE
(
RowID INT IDENTITY(1,1),
DataID INT
)
INSERT INTO #main values (1),(2),(3),(4),(5),(6),(7)
--INSERT INTO #Selected values (1),(2),(3)
--INSERT INTO #Selected values (4),(5),(6)
--INSERT INTO #Selected values (7),(1),(2)
--INSERT INTO #Selected values (3),(4),(5)
INSERT INTO #Selected values (6),(7),(1)
--INSERT INTO #Selected values (2),(3),(4)
--INSERT INTO #Selected values (5),(6),(7)
--INSERT INTO #Selected values (1),(2),(3)
DECLARE
#LastDataID INT,
#FinalCount INT
SELECT
TOP 1
#LastDataID = DataID
FROM
#selected
ORDER BY
RowID
DESC
INSERT INTO #final
SELECT
TOP 3
DataID
FROM
#main
WHERE
DataID > #LastDataID
SELECT #FinalCount = COUNT(1) FROM #final
IF (ISNULL(#FinalCount, 0 ) < 3)
BEGIN
INSERT INTO #final
SELECT
TOP (3 - #FinalCount)
DataID
FROM
#main
END
SELECT * FROM #final
The key was to have reference to the last record moved to the "moved/selected" table. It worked as expected.