Where can I find documentation about "set @i -=-+-+-@i " construction

• Alexander Kovacs

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  November 3, 2008 at 1:16 am

  #75350

  When I was trying what kind of construction TSQL in SQL 2008 would allowed I came at this stupid construction.

  declare @i bigint = 6

  set @i -= @i

  print @i

  SET @i = 6

  set @i -=-@i

  print @i

  SET @i = 6

  set @i -=-+@i

  print @i

  SET @i = 6

  set @i -=-+-@i

  print @i

  print @i

  SET @i = 6

  set @i -=-+-+@i

  print @i

  SET @i = 6

  set @i -=-+-+-@i

  print @i

  the result was

  0

  12

  12

  0

  0

  0

  12

  My question is where can I find something about this construction "-+-+-" and is there any use for this?

• Alexander Kovacs

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  Points: 3075

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  November 3, 2008 at 2:02 am

  #892899

  I am sorry This is sql 2008.

  i repost it in the correct group