Assistance with a LEFT OUTER JOIN query

Hello, all,

I am having some issues trying to put together an SQL query of an Oracle 11g database, and I could use some help.

Let's say tableA is blog entries; tableC is comments for the blog entries; tableB is the associative table:

tableA
blogID        blogTitle       blogBody      dateEntered
1             This is a test  More text...  2016-05-20 11:11:11
2             More testing    Still more!   2016-05-19 10:10:10
3             Third charm!!   Blah, blah.   2016-05-18 09:09:09

tableC
commID        userID          userText      dateEntered
10            Bravo           I like it!    2016-05-20 11:21:31
11            Charlie         I don't!      2016-05-20 11:31:51
12            Alpha           Do it again!  2016-05-19 10:20:30
13            Bravo           Still more?   2016-05-19 10:30:50
14            Charlie         So, what?     2016-05-19 10:35:45
15            Bravo           Blah, what?   2016-05-18 09:10:11
16            Alpha           Magic number! 2016-05-18 09:11:13

tableB
blogID        commID
1             10
1             11
1             12
2             13
2             14
3             15
3             16

I'm attempting to get blogID, blogTitle, blogBody, and a count of the number of comments for each blog entry.  But, since I'm using to_char() for the date, and COUNT(commID) for the total number of comments, I'm getting "not a group by expression".

Here is a pseudo-SQL example of what I am trying.

SELECT a.blogID, a.blogTitle, a.blogBody, to_char(a.dateEntered,'YYYY-MM-DD HH24:MI:SS') as dateEntered, COUNT(c.commID) as total
FROM tableA a LEFT OUTER JOIN tableB b ON b.blog_ID = a.blog_ID
              LEFT OUTER JOIN tableC c ON c.commID = b.commID
WHERE a.blogID = '1'
GROUP BY blogID, blogTitle, blogBody
ORDER BY to_date(dateEntered,'MM-DD-YYYY HH24:MI:SS') desc

I'm pretty sure it's something simple, but I am just NOT seeing it.  Can you help?

V/r,

^_^