CREATE NONCLUSTERED INDEX [IX_Tab1] ON [dbo].[Tab1] 
(
  [idstruttura] ASC,
  [idcliente] ASC,
  [data_arrivo] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO