USE [VeritabanıAdı];
GO

DECLARE @TableName NVARCHAR(255);
DECLARE table_cursor CURSOR FOR 
SELECT name FROM sys.tables;

OPEN table_cursor;
FETCH NEXT FROM table_cursor INTO @TableName;

WHILE @@FETCH_STATUS = 0  
BEGIN  
       EXEC ('ALTER INDEX ALL ON ' + @TableName + ' REBUILD;');
       FETCH NEXT FROM table_cursor INTO @TableName; 
END;

CLOSE table_cursor;  
DEALLOCATE table_cursor; 
GO