在视图中将数据类型nvarchar转换为数字时出错

Question

I have a view:

SELECT
u.display_name AS usuario,
g.parent_name AS grupo,
pr.pkey,
REPLACE(
    CONVERT (VARCHAR, ji.CREATED, 111),
    '/',
    '-'
) AS fecha,
CAST (ji.issuetype AS INT) AS issuetype,
a.customvalue AS aplicativo,
m.customvalue AS modulo
FROM
jiraissue AS ji
JOIN project pr ON pr.ID = ji.PROJECT
JOIN (
SELECT
    ms.*
FROM
    cwd_membership ms
INNER JOIN cwd_group gp ON (
    gp.ID = ms.parent_id
    AND group_name IN (
        'Grupo QA 1',
        'Grupo QA 2',
        'Grupo QA 3',
        'BH Seguros Homo'
    )
)
) g ON g.lower_child_name = ji.REPORTER
JOIN cwd_user u ON g.lower_child_name = u.user_name
JOIN (
SELECT
    ISSUE,
    customvalue
FROM
    customfieldvalue v
INNER JOIN customfield f ON (
    f.ID = v.customfield
    AND f.cfname = 'Aplicativo'
)
INNER JOIN customfieldoption o ON (o.ID = v.STRINGVALUE)
) a ON (a.ISSUE = ji.ID)
JOIN (
SELECT
    ISSUE,
    customvalue
FROM
    customfieldvalue v
INNER JOIN customfield f ON (
    f.ID = v.customfield
    AND f.cfname = 'Módulo'
)
INNER JOIN customfieldoption o ON (o.ID = v.STRINGVALUE)
) m ON (m.ISSUE = ji.ID)
WHERE
ji.issuetype IN (9, 11, 12, 13, 14, 15)
GROUP BY
ji.issuetype,
pr.pkey,
g.parent_name,
u.display_name,
REPLACE(
    CONVERT (VARCHAR, ji.CREATED, 111),
    '/',
    '-'
),
a.customvalue,
m.customvalue

And this gives me something like this:

usuario             grupo      pkey     fecha       issuetype  aplicativo 
----------------------------------------------------------------------------------
Ricardo A. Casares  Grupo QA 1  GD123   2012-11-23  12  Act-creditos-scheduler  ABM_Suc-backend

And then, when I try to query this view, let's say a simple query:

SELECT * FROM view
WHERE pkey LIKE '%GD123%'

In some columns I'm getting "Error converting data type nvarchar to numeric" But in some other columns, like "aplicativo" it is working fine.

Why is this happening?

Answer 1

The problem is with this assignment:

o.ID = v.STRINGVALUE

please correct it and it will solve the issue. A possible way to correct the issue is to use ISNUMERIC, eg

o.ID = CASE WHEN ISNUMERIC(v.STRINGVALUE) = 1 THEN v.STRINGVALUE ELSE -1 END

(in the ELSE you can use some other number that is guaranteed to not join with table 'o', ie you can use 0)

Answer 2

This error means that you have some column which is of type nvarchar and you're trying to make a conversion to a numeric value (int, for instance).
BUT in at least on of the rows returned, that value cannot be converter to a numeric.

For example - trying to convert "abcd" to a numeric will raise that error.

In the query you supplied it is probably on the line: CAST (ji.issuetype AS INT) AS issuetype

Check if any of the data in ji.issuetype is not a string represention of a number...

Answer 3

Another thing you can try is to use ARITHABORT to tell SQL to just NULL values it cant cast.

For example, using SET ARITHABORT OFF & SET ANSI_WARNINGS OFF before selecting from the view should NULL the values it fails to cast (instead of throwing exceptions) - you can then see what rows (and in turn what values) are giving you grief.