SQL Server ordnar om sekvensnummer när poster flyttas upp eller ner

Du måste känna till den gamla positionen innan du kan flytta runt föremål. Och din logik måste vara olika beroende på om objektet har flyttats upp eller ned. Den grova beskrivningen av processen (ej testad) är följande:

DECLARE @Id INT = 1100000004; -- this id
DECLARE @NewPosition INT = 1; -- needs to have this position

WITH RowToMove AS (
    -- using cte instead of variables
    SELECT Plan_Id, sequence_no AS OldPosition
    FROM planRecords
    WHERE Id = @Id
), RowsToUpdate AS (
    -- columns used inside set and where clause of the update statement
    SELECT Id, sequence_no, OldPosition
    FROM planRecords
    CROSS JOIN RowToMove
    -- select rows that belong to same category and position between old and new
    WHERE planRecords.Plan_Id = RowToMove.Plan_Id AND sequence_no BETWEEN 
        CASE WHEN OldPosition < @NewPosition THEN OldPosition ELSE @NewPosition END AND
        CASE WHEN OldPosition > @NewPosition THEN OldPosition ELSE @NewPosition END
)
UPDATE RowsToUpdate SET sequence_no = CASE
    WHEN Id = @Id THEN @NewPosition -- this is the row we are moving
    WHEN OldPosition < @NewPosition THEN sequence_no - 1 -- row was moved down, move other rows up
    WHEN OldPosition > @NewPosition THEN sequence_no + 1 -- row was moved up, move other rows down
END;

Demo på DBFiddle använda variabler , med CTE