select in select sql

SELECT * FROM table_name; 

select [all/distinct] <COL1>, <COL2>, <COL3>
from <TABLE_NAME>
[join <JOIN_CONDITION>]
[where <CONDITION>]
[group by <COLUMN_NAME>]
[having <SEARCH_CONDITION>]
[order by <SORT_SPECIFICATION>]


/*
Specifically for SQL -> Oracle

LEGEND: 
[...]   :   optional entries
<...>   :   your specific entry
*/

SELECT * FROM TABLE_NAME;

SELECT column_name FROM table_name;

SELECT column1, column2, ...

FROM table_name; 

SELECT column-names  FROM table-name1 WHERE value IN (SELECT column-name                   FROM table-name2                   WHERE condition)

Everything in brackets is optional.
SELECT [all/distinct] <COL1>, <COL2>, <COL3>
FROM <TABLE_NAME>
[JOIN <JOIN_CONDITION>]
[WHERE <CONDITION>]
[GROUP BY <COLUMN_NAME>]
[HAVING <SEARCH_CONDITION>]
[ORDER BY <SORT_SPECIFICATION>]

SELECT column1 = (SELECT column-name FROM table-name WHERE condition),       column-names  FROM table-name WEHRE condition