subquery in FROM must have an alias
Add an ALIAS onto the subquery,
SELECT COUNT(made_only_recharge) AS made_only_rechargeFROM ( SELECT DISTINCT (identifiant) AS made_only_recharge FROM cdr_data WHERE CALLEDNUMBER = '0130' EXCEPT SELECT DISTINCT (identifiant) AS made_only_recharge FROM cdr_data WHERE CALLEDNUMBER != '0130' ) AS derivedTable -- <<== HERE
In the case of nested tables, some DBMS require to use an alias like MySQL and Oracle but others do not have such a strict requirement, but still allow to add them to substitute the result of the inner query.