SQL

oracle list tables

SELECT * FROM USER_TABLES;		-- Tables from connected schema
SELECT * FROM ALL_TABLES;		-- Tables available to connected schema
	SELECT * FROM ALL_TABLES WHERE OWNER = 'SCHEMA_NAME';
	SELECT * FROM ALL_TABLES WHERE TABLES_NAME = 'TABLE_NAME';
SELECT * FROM DBA_TABLES;		-- All Tables

oracle list tablespaces

SELECT DISTINCT TABLESPACE_NAME FROM DBA_EXTENTS ORDER BY TABLESPACE_NAME;

SELECT TABLESPACE_NAME,
       sum(BYTES / 1024 / 1024) AS MB
FROM DBA_DATA_FILES GROUP BY TABLESPACE_NAME;

oracle all tables

-- NOTE: for Oracle ONLY

select * 
from all_tables;

oracle tablespace tables list

SELECT e.OWNER, e.SEGMENT_NAME, e.TABLESPACE_NAME, sum(e.bytes) / 1048576 AS Megs
FROM dba_extents e
WHERE
  e.OWNER = 'MY_USER' AND
  e.TABLESPACE_NAME = 'MY_TABLESPACE'
GROUP BY e.OWNER, e.SEGMENT_NAME, e.TABLESPACE_NAME
ORDER BY e.TABLESPACE_NAME, e.SEGMENT_NAME;