Tablespace growth report using sqlplus

Below script to find the growth of tablespace in oracle database:

Script:

set linesize 120
column name format a15
column variance format a20
alter session set nls_date_format='yyyy-mm-dd';
with t as (
select ss.run_time,ts.name,round(su.tablespace_size*dt.block_size/1024/1024/1024,2) alloc_size_gb,
round(su.tablespace_usedsize*dt.block_size/1024/1024/1024,2) used_size_gb
from
dba_hist_tbspc_space_usage su,
(select trunc(BEGIN_INTERVAL_TIME) run_time,max(snap_id) snap_id from dba_hist_snapshot
group by trunc(BEGIN_INTERVAL_TIME) ) ss,
v$tablespace ts,
dba_tablespaces dt
where su.snap_id = ss.snap_id
and   su.tablespace_id = ts.ts#
---and   ts.name          =upper('&TABLESPACE_NAME')
and   ts.name          = dt.tablespace_name )
select e.run_time,e.name,e.alloc_size_gb,e.used_size_gb curr_used_size_gb,b.used_size_gb prev_used_size_gb,
case when e.used_size_gb > b.used_size_gb then to_char(e.used_size_gb - b.used_size_gb)
     when e.used_size_gb = b.used_size_gb then '***NO DATA GROWTH'
     when e.used_size_gb < b.used_size_gb then '******DATA PURGED' end variance
from t e, t b
where e.run_time = b.run_time + 1
order by 1;

Output: