SQL Server“varchar值的转换'99101500728'溢出了一个int列。”

Question

This is my issue: when I run this query, there is no problem and returns the results as expected

SELECT * 
FROM a 
INNER JOIN b ON a.OpId = b.OpId
INNER JOIN c ON b.AdId = c.AdId
INNER JOIN d ON c.AdId = d.AdId
INNER JOIN e ON a.CId = e.CId
INNER JOIN f ON b.OpId = f.OpId
INNER JOIN g ON a.AdRId = g.AdRId
INNER JOIN s ON c.AdSId = s.AdSId 
WHERE f.document = '52147896'

However, when I try to execute it using the EXEC command, it does not work!!

Here is the problematic code

declare @document varchar(20) = '52147896' --This is the correct type for this attribute since I took it directly from the table type
DECLARE @SELECT2 nvarchar(max) = 'SELECT * FROM a inner join  b ON 
a.OpId = b.OpId
INNER JOIN c ON b.AdId = c.AdId
INNER JOIN d ON c.AdId = d.AdId
INNER JOIN e ON a.CId = e.CId
INNER JOIN f ON b.OpId = f.OpId
INNER JOIN g ON a.AdRId = g.AdRId
INNER JOIN s ON c.AdSId = s.AdSId WHERE 
f.document = '+@document

And this is the error I get:

Msg 248, Level 16, State 1, Line 1
The conversion of the varchar value '99101500728' overflowed an int column.

Can someone help me with this issue?

Thanks in advance

Answer 1

If the type is a string, then inclose the value in single quotes:

. . . 
f.document = '''+ @document + ''''

Better yet, use parameters and pass the value in using sp_executesql .

Answer 2

The difference that's causing the error lies on this line:

f.document = '52147896' -- Expression without EXEC

versus

f.document = 52147896 -- Expression with EXEC

On the second case, since you are comparing against an integer value, the SQL enging will convert the column f.document to integer to do the comparison, as stated by the data type precedence . When it tries to convert, the varchar value '99101500728' is too big for an int a fails.

To solve it, write your value as string literal by adding single quotes before and after:

declare @document varchar(20) = '52147896' --This is the correct type for this attribute since I took it directly from the table type
DECLARE @SELECT2 nvarchar(max) = 'SELECT * FROM a inner join  b ON 
a.OpId = b.OpId
INNER JOIN c ON b.AdId = c.AdId
INNER JOIN d ON c.AdId = d.AdId
INNER JOIN e ON a.CId = e.CId
INNER JOIN f ON b.OpId = f.OpId
INNER JOIN g ON a.AdRId = g.AdRId
INNER JOIN s ON c.AdSId = s.AdSId WHERE 
f.document = '''+@document + ''''

Answer 3

Your where clause is passing an integer value.

WHERE f.document = 52147896

This is causing an implicit conversion of f.document to an INT data type. One of your ID values has a character string of 99101500728, but this will not convert to an INT data type.

You can fix your dynamic SQL by escaping the single quotes so that your WHERE clause passes the value as a string

'WHERE f.document = ''' + @document + ''''

which will generate

WHERE f.document = '52147896'