вы можете использовать запрос следующим образом:
SELECT
`NAME`
,`ACCOUNT`
,`SALARY`
, (SELECT count(*) FROM abc WHERE `ACCOUNT` = a.`ACCOUNT`) AS 'ACCOUNT COUNT'
FROM abc a;
образец
MariaDB []> SELECT
-> `NAME`
-> ,`ACCOUNT`
-> ,`SALARY`
-> , (SELECT count(*) FROM abc WHERE `ACCOUNT` = a.`ACCOUNT`) AS 'ACCOUNT COUNT'
-> FROM abc a;
+------+---------+--------+---------------+
| NAME | ACCOUNT | SALARY | ACCOUNT COUNT |
+------+---------+--------+---------------+
| a | 12 | 1222 | 2 |
| b | 113 | 222222 | 1 |
| c | 21 | 2221 | 1 |
| d | 12 | 2432 | 2 |
+------+---------+--------+---------------+
4 rows in set (0.00 sec)
MariaDB []>