sql server 2008 - Updating a column based on 3 tables and 2 rules -


i have 3 tables follows:

declare @tablea table (id int, name varchar(2)); declare @tableb table (name varchar(2)); declare @tablec table (id int, name varchar(2)) insert @tablea(id, name)     select 01, 'a4' union     select 01, 'sh' union     select 01, '9k' union     select 02, 'm1' union     select 02, 'l4' union     select 03, '2g' union     select 03, '99';  insert @tableb(name)     select '5g' union     select 'u8' union     select '02' union     select '45' union     select '23' union     select 'j7' union     select '99' union     select '9f' union     select 'a4' union     select 'h2'; insert @tablec(id)     select 01 union     select 01 union     select 01 union     select 02 union     select 02 union     select 03 union     select 03;

basically, @tablec.id populated @tablea.id (same rows)

now, have populate @tablec.name considering following rules:

  1. it should values @tableb.name , provided same @tablea.name should not exists same id in @tablea. id = 1, @tablec.name should values a4, sh, 9k.

  2. @tablec.name should distinct each @tablec.id. @tablec.name should not have 2 same values same id have same @tablec.name different ids.

the query using solve rule#1 : (please edit apply rule #2)

update c     set name = (select top 1 b.name                 @tableb b                  b.name not in (select name @tablea a.id = c.id)       order newid()                ) @tablec c select * @tablec

sql server 2012: join 3 tables condition

clean @tablec before executing code above:

declare @tabled table (id int, name varchar(2))  insert @tabled select distinct * @tablec  delete @tablec  insert @tablec select * @tabled  update c     set name = (select top 1 b.name                 @tableb b                  b.name not in (select name @tablea a.id = c.id)       order newid()                ) @tablec c select * @tablec

there may more graceful way of doing this, quick way if not lot of rows in @tablec.


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