SQL> select con_id,NAME,OPEN_MODE from v$pdbs;
CON_ID
----------
NAME
--------------------------------------------------------------------------------
OPEN_MODE
----------
2
PDB$SEED
READ ONLY
3
RACDB1PDB
MOUNTED
CON_ID
----------
NAME
--------------------------------------------------------------------------------
OPEN_MODE
----------
SQL> col con_id for 999
SQL> col NAME format a20
SQL> col OPEN_MODE format a30
SQL> select con_id,NAME,OPEN_MODE from v$pdbs;
CON_ID NAME OPEN_MODE
------ -------------------- ------------------------------
2 PDB$SEED READ ONLY
3 RACDB1PDB MOUNTED注：如字段为number类型，col xxx for 999 。 字符串 col xxx for axx。
number 如用axx则会出现###.