If the tablespace that is dropped is empty, but is the default storage space for any partition, the drop operation will cause the ORA-14404 error and will not be dropped.
An error will occur during the process as follows.
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						SQL> drop tablespace TABLE_SPACE_NAME including contents ; drop tablespace TABLE_SPACE_NAME including contents * ERROR at line 1: ORA-14404: partitioned table contains partitions in a different tablespace  | 
					
In this case, it is necessary to detect the partition and change the tablespace information.
You can use the following query to detect the partition that uses Tablespace.
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						  SELECT table_owner,          table_name,          partition_name,          tablespace_name     FROM dba_tab_partitions    WHERE (table_owner, table_name) IN (  SELECT table_owner, table_name                                            FROM dba_tab_partitions X                                           WHERE     x.tablespace_name =                                                        UPPER ('TABLESPACE_NAME')                                                 AND EXISTS                                                        (SELECT *                                                           FROM dba_tab_partitions Y                                                          WHERE     x.table_owner =                                                                       y.table_owner                                                                AND x.table_name =                                                                       y.table_name                                                                AND y.tablespace_name <>                                                                       UPPER (                                                                          'TABLESPACE_NAME'))                                        GROUP BY table_owner, table_name) ORDER BY 1, 2, partition_position;  | 
					
Write your tablespace name instead of TABLESPACE_NAME in the above query.
After detecting Partition, you can change the tablespace that partittion uses with the following command:
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						ALTER TABLE USER.TABLE MOVE PARTITION PARTITION_NAME TABLESPACE NEW_TABLESPACE_NAME NOLOGGING;  | 
					
The corresponding tablespace can then be dropped succesfuly.
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						SQL> DROP TABLESPACE TABLO_ALANI INCLUDING CONTENTS AND DATAFILES; Tablespace dropped.  |