Move node in nested set

Question

I\'d need a MySQL query that moves a node and all its children within a nested set. I found this site, but that function just seems so illogical - there\'s no universe

Answer 1

I know this post is old but im posting this solution for every one else that will get here to see a solution.I found this @ sedna-soft.de . I tested id and works perfectly

 -- moves a subtree before the specified position
 -- if the position is the rgt of a node, the subtree will be its last child
 -- if the position is the lft of a node, the subtree will be inserted before
 -- @param l the lft of the subtree to move
 -- @param r the rgt of the subtree to move
 -- @param p the position to move the subtree before




 SET @r: , @l: , @p: 

 update tree
 set
 lft = lft + if (@p > @r,
    if (@r < lft and lft < @p,
        @l - @r - 1,
        if (@l <= lft and lft < @r,
            @p - @r - 1,
            0
        )
    ),
    if (@p <= lft and lft < @l,
        @r - @l + 1,
        if (@l <= lft and lft < @r,
            @p - @l,
            0
        )
    )
),
rgt = rgt + if (@p > @r,
    if (@r < rgt and rgt < @p,
        @l - @r - 1,
        if (@l < rgt and rgt <= @r,
            @p - @r - 1,
            0
        )
    ),
    if (@p <= rgt and rgt < @l,
        @r - @l + 1,
        if (@l < rgt and rgt <= @r,
            @p - @l,
            0
        )
    )
        )
  where @r < @p or @p < @l;