sql - return value of stored procedure based on different rules -

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i writing stored procedure values based on following tables.

enter image description here

i filling apartment flats according nationality of buyers.

the stored procedure has return next non-occupied flat based on following rules:

  • if new entry comes, need suggest non-occupied flat next occupied-flat having same nationality of new person

  • if no match found above condition, allocate first flat in floor no flats occupied

  • if no match found above condition, allocate flat having at-least 2 empty flats on both sides

  • if no match found above condition, allocate first flat empty according sort order

note:

  • each flat identified combination of floor & flat no

  • sort order flat , floors while searching should 1 n

sample input: name: randy nationality: brazil

sample output: floor:1 flat no: 4 (w.r.t. attached image)

the key create columns each of criteria, i.e. 1 column if next door flat owner has same nationality, column if floor empty.

you can take criteria , place them within order of row_number() function flats in order defined. key part in below query this:

rownumber = row_number() over(order previsnationalitymatch desc,                                          nextisnationalitymatch desc,                                          emptyfloor desc,                                          emptyflatseitherside desc,                                         floor,                                          flatno)

the 4 columns (previsnationalitymatch, nextisnationalitymatch, emptyfloor', 'emptyflatseitherside), bit fields, if row exists previous flat owned of same nationality ranked 1 row_number function, otherwise looks if next flat owned of same nationality (i added rule seemed logical removed removing order by), , on , on until left sorting floor , flat no.

declare @newownernationality varchar(20) = 'brazil'; flatownernationality (   select  flatmaster.floor,              flatmaster.flatno,              flatmaster.isoccupied,             isnationalitymatch = case when ownermaster.ownernationality = @newownernationality 1 else 0 end        flatmaster             left join ownermaster                 on ownermaster.ownername = flatmaster.ownername ), flats (   select  flatmaster.floor,             flatmaster.flatno,             flatmaster.isoccupied,             emptyflatseitherside = case when prevflat.isoccupied = 'no' , nextflat.isoccupied  = 'no' 1 else 0 end,             emptyfloor = case when count(case when flatmaster.isoccupied = 'yes' 1 end) over(partition flatmaster.floor) = 0 1 else 0 end,             previsnationalitymatch = isnull(prevflat.isnationalitymatch, 0),             nextisnationalitymatch = isnull(nextflat.isnationalitymatch, 0)        flatmaster             left join flatownernationality prevflat                 on prevflat.floor = flatmaster.floor                 , prevflat.flatno = flatmaster.flatno - 1             left join flatownernationality nextflat                 on nextflat.floor = flatmaster.floor                 , nextflat.flatno = flatmaster.flatno + 1 ), rankedflats (   select  *,             rownumber = row_number() over(order previsnationalitymatch desc,                                                      nextisnationalitymatch desc,                                                      emptyfloor desc,                                                      emptyflatseitherside desc,                                                     floor,                                                      flatno)        flats       isoccupied = 'no' ) select  floor,         flatno,         matchedon = case when previsnationalitymatch = 1 'first flat after same nationality owner'                         when nextisnationalitymatch = 1 'first flat before same nationality owner'                         when emptyfloor = 1 'no nationality match, placed on empty floor'                         when emptyflatseitherside = 1 'next flat empty flats either side'                         else 'first available flat'                     end    rankedflats   rownumber = 1;

brazil example - floor 1, flat 4

england example - floor 1, flat 2

spain example - floor 2, flat 1

edit

declare @newownernationality varchar(20) = 'brazil';  flatownernationality (   select  flatmaster.floor,              flatmaster.flatno,              flatmaster.isoccupied,             isnationalitymatch = case when ownermaster.ownernationality = @newownernationality 1 else 0 end        flatmaster             left join ownermaster                 on ownermaster.ownername = flatmaster.ownername ), flats (   select  flatmaster.floor,             flatmaster.flatno,             flatmaster.isoccupied,             emptyflatseitherside = case when prevflat.isoccupied = 'no' , nextflat.isoccupied  = 'no' , prevflat2.isoccupied = 'no' , nextflat2.isoccupied  = 'no' 1 else 0 end,             emptyfloor = case when count(case when flatmaster.isoccupied = 'yes' 1 end) over(partition flatmaster.floor) = 0 1 else 0 end,             previsnationalitymatch = isnull(prevflat.isnationalitymatch, 0),             nextisnationalitymatch = isnull(nextflat.isnationalitymatch, 0)        flatmaster             left join flatownernationality prevflat                 on prevflat.floor = flatmaster.floor                 , prevflat.flatno = flatmaster.flatno - 1             left join flatownernationality nextflat                 on nextflat.floor = flatmaster.floor                 , nextflat.flatno = flatmaster.flatno + 1             left join flatmaster prevflat2                 on prevflat2.floor = flatmaster.floor                 , prevflat2.flatno = flatmaster.flatno - 2             left join flatmaster nextflat2                 on nextflat2.floor = flatmaster.floor                 , nextflat2.flatno = flatmaster.flatno + 2  ), rankedflats (   select  *,             rownumber = row_number() over(order previsnationalitymatch desc,                                                      nextisnationalitymatch desc,                                                      emptyfloor desc,                                                      emptyflatseitherside desc,                                                     floor,                                                      flatno)        flats       isoccupied = 'no' ) select  floor,         flatno,         matchedon = case when previsnationalitymatch = 1 'first flat after same nationality owner'                         when nextisnationalitymatch = 1 'first flat before same nationality owner'                         when emptyfloor = 1 'no nationality match, placed on empty floor'                         when emptyflatseitherside = 1 'next flat empty flats either side'                         else 'first available flat'                     end    rankedflats   rownumber = 1;

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