Not able to fetch the explain plan

Question

whenever i fire this query, its giving table does not exits
SQL> EXPLAIN PLAN for SELECT
S_CONTACT.ROW_ID,
2 3 S_CONTACT.MODIFICATION_NUM,
4 S_CONTACT.LAST_UPD
5 FROM
6 S_CONTACT,
7 S_CONTACT_FNX,
8 S_ETL_I_IMG_118 IMG
9 WHERE
10 (
11 IMG.ROW_ID = S_CONTACT_FNX.ROW_ID
12 AND
13 S_CONTACT_FNX.PAR_ROW_ID = S_CONTACT.ROW_ID
14 )
15 AND NOT EXISTS
16 ( SELECT 'X'
17 FROM
18 S_ETL_I_IMG_12 IMG1
19 WHERE
20 IMG1.ROW_ID = S_CONTACT.ROW_ID
21 )
UNION ALL
22 23 SELECT
24 S_CONTACT.ROW_ID,
25 S_CONTACT.MODIFICATION_NUM,
26 S_CONTACT.LAST_UPD
27 FROM
28 S_CONTACT,
29 S_ETL_I_IMG_109 IMG
30 WHERE
31 (
32 IMG.ROW_ID = S_CONTACT.PR_SPECIALTY_ID
33 )
AND NOT EXISTS
34 35 ( SELECT 'X'
36 FROM
37 S_ETL_I_IMG_12 IMG1
38 WHERE
39 IMG1.ROW_ID = S_CONTACT.ROW_ID
40 )
41 UNION ALL
42 SELECT
43 S_CONTACT.ROW_ID,
44 S_CONTACT.MODIFICATION_NUM,
45 S_CONTACT.LAST_UPD
46 FROM
47 S_CONTACT,
48 S_ETL_I_IMG_113 IMG
49 WHERE
50 (
51 IMG.ROW_ID = S_CONTACT.MED_SPEC_ID
52 )
53 AND NOT EXISTS
54 ( SELECT 'X'
55 FROM
56 S_ETL_I_IMG_12 IMG1
57 WHERE
58 IMG1.ROW_ID = S_CONTACT.ROW_ID
59 )
UNION ALL
60 61 SELECT
62 S_CONTACT.ROW_ID,
63 S_CONTACT.MODIFICATION_NUM,
64 S_CONTACT.LAST_UPD
65 FROM
66 S_CONTACT,
67 S_ETL_I_IMG_125 IMG
68 WHERE
69 (
70 IMG.ROW_ID = S_CONTACT.REGION_ID
71 )
72 AND NOT EXISTS
73 ( SELECT 'X'
74 FROM
75 S_ETL_I_IMG_12 IMG1
76 WHERE
77 IMG1.ROW_ID = S_CONTACT.ROW_ID
78 );
S_ETL_I_IMG_118 IMG
ERROR at line 8:
ORA-00942: table or view does not exist

Answer 1

Not really a good idea to do it a SYS user, but it's up to you.
I bet the tables are not in the SYS schema and you're not prefixing the names with the schema name in you select statement. So unless you have private synonyms in SYS schema or public synonyms for all those tables they're not visible by SYS without the prefix e.g.
TABLE_OWNER.TABLE_NAME