Can someone explain to me how to use Xcode?

I just got the app Xcode and I am so exited to use it. But once I tried it, I was so confused. Can someone explain to me how to use Xcode?

Become a paid developer, download all the thousands of manual pages and read them.
developer.apple.com

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      2  dbf_size as (select sum(bytes) size_
      3                 from dba_data_files where tablespace_name='TEST'),
      4  dbf_free as (select sum(bytes) free_
      5                 from dba_free_space where tablespace_name='TEST'),
      6  dbf_used as (select sum(bytes) used_
      7                 from dba_segments where tablespace_name='TEST')
      8  select size_, free_, used_, (size_ - free_ - used_) left_
      9         from dbf_size, dbf_free, dbf_used
    10  /
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    SQL>and then I played around with my SQL and came up with
    WITH
    dbf_size AS (SELECT SUM(bytes) size_
                   FROM dba_data_files
                  WHERE tablespace_name='TEST'),
    dbf_free AS (SELECT SUM(bytes) free_
                   FROM dba_free_space
                  WHERE tablespace_name='TEST'),
    dbf_used AS (SELECT SUM(bytes) used_
                   FROM dba_segments
                  WHERE tablespace_name='TEST'),
    dbf_fbin AS (SELECT SUM(bytes) fbin_
                   FROM dba_segments
                  INNER JOIN
                        dba_recyclebin
                     ON (tablespace_name=ts_name
                         AND segment_name=object_name)
                  WHERE tablespace_name='TEST')
    SELECT      size_, -- tablespace size
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         (size_ - free_ - used_ + fbin_) left_ -- 64K overhead per data file
      FROM      dbf_size, dbf_free, dbf_used, dbf_fbin
    /which does
    SQL> WITH
      2  dbf_size AS (SELECT SUM(bytes) size_
      3                 FROM dba_data_files
      4                WHERE tablespace_name='TEST'),
      5  dbf_free AS (SELECT SUM(bytes) free_
      6                 FROM dba_free_space
      7                WHERE tablespace_name='TEST'),
      8  dbf_used AS (SELECT SUM(bytes) used_
      9                 FROM dba_segments
    10                WHERE tablespace_name='TEST'),
    11  dbf_fbin AS (SELECT SUM(bytes) fbin_
    12                 FROM dba_segments
    13                INNER JOIN
    14                      dba_recyclebin
    15                   ON (tablespace_name=ts_name
    16                       AND segment_name=object_name)
    17                WHERE tablespace_name='TEST')
    18  SELECT     size_,
    19     free_,
    20     used_,
    21     fbin_,
    22     (size_ - free_ - used_ + fbin_) left_
    23    FROM     dbf_size, dbf_free, dbf_used, dbf_fbin
    24  /
         SIZE_      FREE_      USED_      FBIN_      LEFT_
       5242880    5177344    2162688    2162688      65536
    SQL> alter tablespace test add datafile 'C:\ORACLE\ORADATA\XE\TEST2.DBF' size 5m;
    Tablespace altered.
    SQL> WITH
      2  dbf_size AS (SELECT SUM(bytes) size_
      3                 FROM dba_data_files
      4                WHERE tablespace_name='TEST'),
      5  dbf_free AS (SELECT SUM(bytes) free_
      6                 FROM dba_free_space
      7                WHERE tablespace_name='TEST'),
      8  dbf_used AS (SELECT SUM(bytes) used_
      9                 FROM dba_segments
    10                WHERE tablespace_name='TEST'),
    11  dbf_fbin AS (SELECT SUM(bytes) fbin_
    12                 FROM dba_segments
    13                INNER JOIN
    14                      dba_recyclebin
    15                   ON (tablespace_name=ts_name
    16                       AND segment_name=object_name)
    17                WHERE tablespace_name='TEST')
    18  SELECT     size_, -- tablespace size
    19     free_, -- free space reported
    20     used_, -- segment space used
    21     fbin_, -- segment space used in recycle bin
    22     (size_ - free_ - used_ + fbin_) left_
    23    FROM     dbf_size, dbf_free, dbf_used, dbf_fbin
    24  /
         SIZE_      FREE_      USED_      FBIN_      LEFT_
      10485760   10354688    2162688    2162688     131072Message was edited by:
    Hans Forbrich
    Cleaned up the script and tested with second data file added to verify LMT overhead.

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