Rebuild index sql server

In Object Explorer, Expand the database that contains the table on which you want to reorganize an index.
Expand the Tables folder.
Expand the table on which you want to reorganize an index.
Expand the Indexes folder.
Right-click the index you want to reorganize and select Rebuild.

Rebuild Index SQL Server

DECLARE @Database NVARCHAR(255)   
    DECLARE @Table NVARCHAR(255)  
    DECLARE @cmd NVARCHAR(1000)  

    DECLARE DatabaseCursor CURSOR READ_ONLY FOR  
    SELECT name FROM master.sys.databases   
    WHERE name IN ('YOUR DATABASE NAME')  -- databases
    AND state = 0 -- database is online
    AND is_in_standby = 0 -- database is not read only for log shipping
    ORDER BY 1  

    OPEN DatabaseCursor  

    FETCH NEXT FROM DatabaseCursor INTO @Database  
    WHILE @@FETCH_STATUS = 0  
    BEGIN  

       SET @cmd = 'DECLARE TableCursor CURSOR READ_ONLY FOR SELECT ''['' + table_catalog + ''].['' + table_schema + ''].['' +  
       table_name + '']'' as tableName FROM [' + @Database + '].INFORMATION_SCHEMA.TABLES WHERE table_type = ''BASE TABLE'''   

       -- create table cursor  
       EXEC (@cmd)  
       OPEN TableCursor   

       FETCH NEXT FROM TableCursor INTO @Table   
       WHILE @@FETCH_STATUS = 0   
       BEGIN
          BEGIN TRY   
             SET @cmd = 'ALTER INDEX ALL ON ' + @Table + ' REBUILD' 
             PRINT @cmd -- uncomment if you want to see commands
             EXEC (@cmd) 
          END TRY
          BEGIN CATCH
             PRINT '---'
             PRINT @cmd
             PRINT ERROR_MESSAGE() 
             PRINT '---'
          END CATCH

          FETCH NEXT FROM TableCursor INTO @Table   
       END   

       CLOSE TableCursor   
       DEALLOCATE TableCursor  

       FETCH NEXT FROM DatabaseCursor INTO @Database  
    END  
    CLOSE DatabaseCursor   
    DEALLOCATE DatabaseCursor

Source: stackoverflow.com

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