Question

I want to get the value SESSIONID from this table:

CREATE TABLE SESSIONSLOG(
  SESSIONID VARCHAR2(30 ) NOT NULL,
  USERNAME VARCHAR2(30 ),
  IPADDRESS VARCHAR2(30 ),
  LOGINTIME TIMESTAMP(6),
  LOGOUTTIME TIMESTAMP(6)
)
/

I tried this SQL query:

SELECT SESSIONID FROM ACTIVESESSIONSLOG

But I get this error message:

ORA-00904: "SESSIONID": invalid identifier
00904. 00000 -  "%s: invalid identifier"
*Cause:    
*Action:
Error at Line: 1 Column: 7

How I can fix this?

Answer 1

You’re querying the wrong table:

CREATE TABLE SESSIONSLOG

…

SELECT SESSIONID FROM ACTIVESESSIONSLOG

ACTIVESESSIONSLOG is not the same as SESSIONSLOG.