Help with the sql

Question

Table 2 is a subset of table 1. All the accounts in table2 are in table 1. Now i want all the accounts in table 1 which are not in table 2. I wrote a sql something like below but ended up getting all the accounts, i know it's because of the left outer join. I need some idea someone please help. Thank you.
select a.account from table 1 a
left outer join
( select account from table 2) turr on turr.account <> a.ccount

Answer 1

There are many ways to achieve that. Here are some ideas:
SELECT account FROM TABLE_1
MINUS
SELECT account FROM TABLE_2
SELECT account
FROM   table_1
WHERE  NOT EXISTS
       ( SELECT null
         FROM   table_2
         WHERE  table_2.account = table_1.account
SELECT account
FROM   table_1
WHERE  account NOT IN (SELECT account FROM table_2)
SELECT table_1.account
FROM      table_1
LEFT JOIN table_2 ON table_1.account = table_2.account
WHERE  table_2.account IS NULL
;