Question

I’m a newbie with Oracle. In SQLite, PostgreSQL or MSSQL I can do the following query:

SELECT * FROM users ORDER BY id, email

Here is the definition of USERS:

CREATE TABLE "USERS" (
 "ID" NUMBER(38,0) NOT NULL,
 "EMAIL" VARCHAR2(255)
)

Id is NUMBER type and email is VARCHAR type.

When I run the above SELECT query in Oracle it will raise the error:

ORA-00932: inconsistent datatypes: expected - got CLOB

Is there anyway to do that in Oracle?

Thank for your interest.

Answer 1

Seems like the email field is a CLOB and not a VARCHAR. You cannot ORDER BY a CLOB.

If your column is a CLOB then you can CAST() the field to order by:

select *
from users
order by id, cast(email as varchar2(50))  -- or whatever length you want.

See SQL Fiddle With Demo