recursion - Nearest record with recursive SQL Server CTE and stepped STDistance -

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when improving closest spatial match performance (geography stdistance) in sql server 2012, have found iteratively stepping search radius increases performance on our datasets.

i have below 3 step query trying turn recursive cte max depth 3, distance comparison [level]*500.

select     n.workid,     m.workid matchworkid,     n.location.stdistance(m.location) meters      #matchwork500      newwork n cross apply      (select top (1)           c.workid, c.location                currwork c                n.location.stdistance(c.location) <= 500      order           n.location.stdistance(c.location)) m select     n.workid,     m.workid matchworkid,     n.location.stdistance(m.location) meters      #matchwork1000      newwork n left join      #matchwork500 m500 on m500.workid = n.workid cross apply      (select top (1)           c.workid, c.location                currwork c                n.location.stdistance(c.location) <= 1000      order           n.location.stdistance(c.location)) m      m500.workid null  select     n.workid,     m.workid matchworkid,     n.location.stdistance(m.location) meters      #matchwork1000      newwork n left join      #matchwork500 m500 on m500.workid = n.workid left join      #matchwork1000 m1000 on m1000.workid = n.workid cross apply      (select top (1)           c.workid, c.location                currwork c                n.location.stdistance(c.location) <= 1500      order          n.location.stdistance(c.location)) m      m500.workid null      , m1000.workid null

each iteration needs process had not been matched previously, single cte table preferably. please no stored procedure answers, assistance appreciated.





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