[sql] Conversion failed when converting the varchar value 'simple, ' to data type int

I am struggling for a few days with this issue and I can't figure out how can I fix it.

I would like to group by my table on values 1,2,3,4,5 so I have created a temporary table with this values.

Now I have to INNER JOIN this table with other tables on a.value = #myTempTable.num.

BUT a.value is ntext so I need to CONVERT it what I actually did, but I am getting an error:

Conversion failed when converting the varchar value 'simple, ' to data type int. (on line 7)

Create table #myTempTable
(
num int
)
insert into #myTempTable (num) values (1),(2),(3),(4),(5)

 SELECT a.name, CONVERT(INT, CONVERT(VARCHAR(12), a.value)) AS value, COUNT(*) AS pocet   
 FROM 
 (SELECT item.name, value.value 
  FROM mdl_feedback AS feedback 
  INNER JOIN mdl_feedback_item AS item 
       ON feedback.id = item.feedback
  INNER JOIN mdl_feedback_value AS value 
       ON item.id = value.item 
   WHERE item.typ = 'multichoicerated' AND item.feedback IN (43)
 ) AS a 
 INNER JOIN #myTempTable 
     on CONVERT(INT, CONVERT(VARCHAR(12), a.value)) = #myTempTable.num
 GROUP BY a.name, CONVERT(INT, CONVERT(VARCHAR(12), a.value)) ORDER BY a.name

 drop table #myTempTable

I am not getting this error without the last INNER JOIN

INNER JOIN #myTempTable on CONVERT(INT, CONVERT(VARCHAR(12), a.value))
= #myTempTable.num

Could you help me please? I am desperate.

Thanks.

If you are converting a varchar to int make sure you do not have decimal places.

For example, if you are converting a varchar field with value (12345.0) to an integer then you get this conversion error. In my case I had all my fields with .0 as ending so I used the following statement to globally fix the problem.

CONVERT(int, replace(FIELD_NAME,'.0',''))

Given that you're only converting to ints to then perform a comparison, I'd just switch the table definition around to using varchar also:

Create table #myTempTable
(
num varchar(12)
)
insert into #myTempTable (num) values (1),(2),(3),(4),(5)

and remove all of the attempted CONVERTs from the rest of the query.

 SELECT a.name, a.value AS value, COUNT(*) AS pocet   
 FROM 
 (SELECT item.name, value.value 
  FROM mdl_feedback AS feedback 
  INNER JOIN mdl_feedback_item AS item 
       ON feedback.id = item.feedback
  INNER JOIN mdl_feedback_value AS value 
       ON item.id = value.item 
   WHERE item.typ = 'multichoicerated' AND item.feedback IN (43)
 ) AS a 
 INNER JOIN #myTempTable 
     on a.value = #myTempTable.num
 GROUP BY a.name, a.value ORDER BY a.name