在SQL server环境查询的时候,出现,从数据类型 varchar 转换为 numeric 时出错。
Select cast(字段 as 数据类型) from 表名
由于数字溢出,那么就需要用到cast,将这两个数字溢出的字段转化为字符型,这样就不会出现溢出的情况了。
CAST(RA.OBJECT_MODULE_ID AS varchar(30)),
CAST(RA.TARGET_MODULE_ID AS varchar(30)),
SELECT
R.*,
'' AS TARGET_NAME,
'' AS PRIMARY_NAME,
'' AS TARGET_STATUS,
'' AS TYPE,
'' AS DETAIL_ID,
'' AS DETAIL_NAME,
'' AS DETAIL_CONTENT,
CAST(RA.OBJECT_MODULE_ID AS varchar(30)),
CAST(RA.TARGET_MODULE_ID AS varchar(30)),
'' AS IS_DELETE
FROM
RELEVANCE R
RIGHT JOIN RELEVANCE_APP RA ON R.ID = RA.RELEVANCE_ID
如果这个字段是一个自定义字段,这样的方式就会报错
找不到这个字段,那么就需要这样写。
select *,cast('自定义的值' as 自定义的字段类型) as '列名' from 表名
两个查询分开查询都没有问题,但是合在一起查询就出现从数据类型 varchar 转换为 numeric 时出错。原因就是数字溢出了,具体怎么溢出的呢,大概就是SQL server会自动把这个字段先转为数字,然后进行一系列的匹配。
SELECT
R.*,
'' AS TARGET_NAME,
'' AS PRIMARY_NAME,
'' AS TARGET_STATUS,
'' AS TYPE,
'' AS DETAIL_ID,
'' AS DETAIL_NAME,
'' AS DETAIL_CONTENT,
'' AS OBJECT_MODULE_ID,
'' AS TARGET_MODULE_ID,
'' AS IS_DELETE
FROM
RELEVANCE R
WHERE
R.TARGET_MODULE IN ( 'customer', 'saleChance', 'contract', 'production', 'competitor', 'contact', 'kpiFlow', 'marketactivity', 'clue', 'orderform', 'price', 'capital', 'quote' ) UNION
SELECT
R.*,
'' AS TARGET_NAME,
'' AS PRIMARY_NAME,
'' AS TARGET_STATUS,
'' AS TYPE,
'' AS DETAIL_ID,
'' AS DETAIL_NAME,
'' AS DETAIL_CONTENT,
RA.OBJECT_MODULE_ID,
RA.TARGET_MODULE_ID,
'' AS IS_DELETE
FROM
RELEVANCE R
RIGHT JOIN RELEVANCE_APP RA ON R.ID = RA.RELEVANCE_ID
最后就成功解决了这个问题。