How to create a table out of the existing table?

Question

So I am having a big table of AbstractID, SentenceID, WordID, and Word. Some words show in multiple files. I would like to count how many files every word shows, and then create a new table of with Word and Count. Below is a piece of my data.

My sql query is below:

CREATE TABLE WORDLIST(WORD, TOTALCOUNT) AS
(
  SELECT WORD FROM ASSIGNMENT2 WHERE
  (
    SELECT WORD, COUNT(*) FROM (select DISTINCT FILEID, WORD FROM ASSIGNMENT2)
    GROUP BY WORD ORDER BY COUNT(*) DESC));

It is giving me an error: "Error report: SQL Error: ORA-00936: missing expression 00936. 00000 - "missing expression" *Cause:
*Action:"

How do I correct this? Thanks.

Answer 1

You're rather overcomplicating the query. The error is because your outer where clause doesn't have a condition; you're selecting multiple things, which isn't right anyway, but then not comparing those to anything. And you don't need to enclose the query in a set of parentheses.

You can just do:

CREATE TABLE WORDLIST (WORD, TOTALCOUNT) AS
SELECT WORD, COUNT(DISTINCT FILEID)
FROM ASSIGNMENT2
GROUP BY WORD;

There's no point ordering the query as it won't affect future queries against the new table - you still have to order those, as there is no inherent order of rows within the table. (And I think an order by will cause an error in a create-as statement, but can't immediately check that).

Creating a table to hold this information seems odd though as it will go out of date quickly. Perhaps you wanted a view really?