Check out example codes for "SELECt sql". It will help you in understanding the concepts better.

Code Example 1

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS -- INFORMATION_SCHEMA is an ANSI-standard (American National Standard Institute) set of read-only views which provide information about all of the tables, views, columns, and procedures in a database
WHERE TABLE_NAME = N'Customers' -- "N" defines the subsequent string (the string after the N) as being in unicode

Code Example 2

SELECT * FROM TABLE_NAME;

Code Example 3

SELECT *
FROM table
WHERE condition
GROUP BY expression
HAVING condition
{ UNION | INTERSECT | EXCEPT }
ORDER BY expression
LIMIT count
OFFSET start

Code Example 4

SELECT * FROM table_name;

--or

SELECT column1, column2
FROM table_name;

Code Example 5

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
*/

Code Example 6

SELECT column1, column2, ...

FROM table_name;

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