I am converting series of queries to Knex syntax.
I am having problem with this query:

```
SELECT id,reviewed,log_reference,CONVERT(notification USING utf8),create_time,update_time,store,user_id
FROM store_failure_log
WHERE reviewed = 0
AND create_time BETWEEN NOW() - INTERVAL 18 HOUR AND NOW();

```

More precisely this line:

```
SELECT id,reviewed,log_reference,CONVERT(notification USING utf8),create_time,update_time,store,user_id

```

I have this Knex in place:

```
knex('store_failure_log')
        .select('id', 'reviewed', 'log_reference', 'CONVERT(notification USING utf8)', 'create_time', 'update_time', 'store', 'user_id').convert('notification USING utf8')
        .where('reviewed', 0)
        .where(knex.raw('create_time BETWEEN NOW() - INTERVAL 18 HOUR AND NOW()'))

```

that produces this sql query:

```
select `id`, `reviewed`, `log_reference`, `CONVERT(notification USING utf8)`, `create_time`, `update_time`, `store`, `user_id` from `store_failure_log` where `reviewed` = 0 and create_time BETWEEN NOW() - INTERVAL 18 HOUR AND NOW()

```

Problem is in the: Convert(notification USING utf8).

The query is not valid, since the Convert is in parentheses. How can I write it with the knex?

In general how do I include SQL function calls in the KNEX syntax?