I'm trying to create a table, but it kept giving me error msg "invalid identifier", I searched again and again, couldn't figure out what's wrong with my code..... please help.....here is my code..
create table ownership
(
oID number not null,
dID number not null,
start date,
end date,
primary key (oID,dID)
foreign key (oID) references owner(oID),
foreign key (dID) references dogs(dID)
);
I imported dogs table from nyc open data, and I also created owner table.....The table names are not wrong, I checked over and over again, the oID in table owner is primary key, so does dID in table dogs..... I tried to delete not null constraint, same error msg, I tried to put constraint pk_ownership before primary key, still get the same error msg.....I really couldn't figure out why... This is for a school project, I'm super super new to sql, it's my 2nd day doing sql......if my question is stupid, please bare me.....Thank you!
You have two major errors:
start
is a reserved word end
is also a keyword, so I would discourage using that as well.
I would suggest something like:
create table ownership (
oID number not null,
dID number not null,
ownership_start date,
ownership_end date,
primary key (oID, dID),
foreign key (oID) references owner(oID),
foreign key (dID) references dogs(dID)
);
In Oracle start
is a reserved word. You can use it if you quote it, as in:
create table ownership
(
oID number not null,
dID number not null,
"start" date,
end date,
primary key (oID,dID),
foreign key (oID) references owner(oID),
foreign key (dID) references dogs(dID)
);
Or... you can simply use a different name such as start_ownership
.
PS: You also had a minor syntax error. You had forgotten a comma at the end of the primary key definition.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.