SQL strange behaviour

Question

Hi
I have created two tables temp_n and temp_c
1) DESC TEMP_N
Name    Null    Type     
COL2         NUMBER
2) DESC TEMP_C
Name    Null    Type     
COL3             NUMBER(1)
3)  SELECT * FROM TEMP_C
COL3
       1
       2
SELECT * FROM TEMP_N
COL2
       4
       5
       6
SELECT * FROM  TEMP_N WHERE COL2 IN (SELECT COL2 FROM TEMP_C);
When i ran the above query, i see the below output instead of throwing error "ORA-00904: "COL2": invalid identifier"
COL2
       4
       5
       6
can anyone explain why i am seeing the above output, instead of throwing error.
When i created the tables with  test and test_1 using same definition instead of using temp_n and temp_c, and ran below query, i am seeing below error
SELECT * FROM  TEST WHERE COL2 IN (SELECT COL2 FROM TEST1);
ORA-00904: "COL2": invalid identifier
00904. 00000 -  "%s: invalid identifier"
*Cause:   
*Action:
Error at Line: 12 Column: 27
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Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
"CORE     10.2.0.1.0     Production"
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NLSRTL Version 10.2.0.1.0 - ProductionThanks,
Niranjan
Edited by: 874799 on Nov 26, 2012 9:22 AM

Answer 1

Hi I tried once again with below test cases and same problem is coming :
Working SQL's:
CREATE TABLE TEM_C(COL1 NUMBER(1));
table TEM_C created.
CREATE TABLE TEM_P(COL2 NUMBER(1));
table TEM_P created.
INSERT INTO TEM_C VALUES(1);
1 rows inserted.
INSERT INTO TEM_C VALUES(2);
1 rows inserted.
INSERT INTO TEM_P VALUES(3);
1 rows inserted.
INSERT INTO TEM_P VALUES(4);
1 rows inserted.
INSERT INTO TEM_P VALUES(5);
1 rows inserted.
SELECT * FROM TEM_P
      COL2
         3
         4
         5
SELECT * FROM TEM_C
      COL1
         1
SELECT * FROM TEM_C WHERE COL1 IN (SELECT COL1 FROM TEM_P);
ORA-00904: "COL1": invalid identifier
00904. 00000 -  "%s: invalid identifier"
*Cause:   
*Action:
Error at Line: 22 Column: 27
Not working SQL
CREATE TABLE TEMP1(COL1 NUMBER(1));
table TEMP1 created.
CREATE TABLE TEMP2(COL1 NUMBER(1));
table TEMP2 created.
INSERT INTO TEMP1 VALUES(1);
1 rows inserted.
INSERT INTO TEMP1 VALUES(2);
1 rows inserted.
INSERT INTO TEMP2 VALUES(3);
1 rows inserted.
INSERT INTO TEMP2 VALUES(4);
1 rows inserted.
INSERT INTO TEMP2 VALUES(5);
1 rows inserted.
SELECT * FROM TEMP2
      COL2
         3
         4
         5
SELECT * FROM TEMP1
      COL1
         1
         2
SELECT * FROM TEMP1 WHERE COL1 IN (SELECT COL1 FROM TEMP2);
      COL1
         1
         2
Oracle Version
select banner from v$version
Banner:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
"CORE     10.2.0.1.0     Production"
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - ProductionEdited by: 874799 on Nov 26, 2012 11:33 AM