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from(select round(sum(bytes)/1024/1024) mbytes_free,tablespace_name
from dba_free_space
group by tablespace_name) a,
(select round(sum(bytes)/1024/1024) mbytes_alloc,tablespace_name
from dba_data_files
group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name
and b.tablespace_name='users'
/
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Oracle字符串函数length、upper、lower、initcap、 concat、instr、replace
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