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SQL query to email customers

Posted on 2009-03-31
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Last Modified: 2013-12-17
I'm trying to email customers in a table when TableA.Location value is NULL. Basically:

if TableA.Location IS NULL
then send an email to the value specified in TableA.Email_ID

Everything works if I have a single result from the query i.e. if only one record meets the argument then an email is sent. However it is not working for multiple results. I get the following error:

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

I'm new to SQL but it seems I need a IF THEN ELSE NEXT query or similar. Can anyone help please?

declare @newline varchar(10)

declare @body varchar(1000)

declare @footer varchar(100)

declare @emailid varchar(100)
 

	set @newline = CHAR(13) + CHAR(10) + CHAR(13) + CHAR(10)
 

	set @footer = 'To change your details please use the following link:' 

				+ @newline +

				'abc' + @newline +

				'123' + @newline +

				'xyz'
 

	set @body = 'The following details need to be updated:' + @newline 
 

		SELECT @body = @body + (rv_custom_incorrect_org.surname + @newline)  
 

		FROM rv_custom_incorrect_org
 

		WHERE rv_custom_incorrect_org.location_name IS NULL
 

	set @body = @body + @newline + @footer 

 

	set @emailid = 
 

		(SELECT rv_custom_incorrect_org.email_id
 

		FROM rv_custom_incorrect_org
 

		WHERE rv_custom_incorrect_org.location_name IS NULL)
 

EXEC msdb.dbo.sp_send_dbmail 
 

    @recipients = @emailid,

    @subject = 'Request to Update Your Customer Details',

    @body = @body,

    @body_format = 'TEXT'

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Question by:Paduwan
  • 2
  • 2
5 Comments
 
LVL 25

Expert Comment

by:reb73
ID: 24036613
The segment below is the problem -

        set @emailid =
 
                (SELECT rv_custom_incorrect_org.email_id
 
                FROM rv_custom_incorrect_org
 
                WHERE rv_custom_incorrect_org.location_name IS NULL)

The subquery is returning multiple rows which cannot be assigned to a single variable. You need to use a cursor to handle this ..
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LVL 29

Accepted Solution

by:
David H.H.Lee earned 125 total points
ID: 24036616
Hi Paduwan,
You need to declare CURSOR to manipulate multiple returned records in this case.
eg:

Amend These lines
=================
set @emailid =
 
                (SELECT rv_custom_incorrect_org.email_id
 
                FROM rv_custom_incorrect_org
 
                WHERE rv_custom_incorrect_org.location_name IS NULL)
 
EXEC msdb.dbo.sp_send_dbmail
 
    @recipients = @emailid,
    @subject = 'Request to Update Your Customer Details',
    @body = @body,
    @body_format = 'TEXT'

To
========
declare
 @acursor cursor,
 @emailid int
 
set @acursor = cursor for SELECT rv_custom_incorrect_org.email_id FROM rv_custom_incorrect_org WHERE rv_custom_incorrect_org.location_name IS NULL

open @acursor
fetch next from @acursor into @emailid
while (@@fetch_status = 0)
begin
 --do something with @emailid variable
 EXEC msdb.dbo.sp_send_dbmail
    @recipients = @emailid,
    @subject = 'Request to Update Your Customer Details',
    @body = @body,
    @body_format = 'TEXT'

 fetch next from @acursor into @emailid
end
 
close @acursor
deallocate @acursor


0
 
LVL 29

Expert Comment

by:David H.H.Lee
ID: 24036629
Hi Paduwan,
Some amendment for @emailid:
@emailid varchar(100)
0
 
LVL 25

Expert Comment

by:reb73
ID: 24036649
Try something like -
declare @newline varchar(10)

declare @body varchar(1000)

declare @footer varchar(100)

declare @emailid varchar(100)

declare @surname varchar(100)

 

        set @newline = CHAR(13) + CHAR(10) + CHAR(13) + CHAR(10)

 

        set @footer = 'To change your details please use the following link:' 

                                + @newline +

                                'abc' + @newline +

                                '123' + @newline +

                                'xyz'

 

declare mycurs insensitive cursor for

	select surname, email_id

	from rv_custom_incorrect_org

	where email_id > ''

	for read only
 

open mycurs

fetch next from mycurs into @surname, @emailid

while (@@fetch_status = 0)

begin
 

        set @body = 'The following details need to be updated:' + @newline + @surname

		    + @newline + @newline + @footer 

 

	EXEC msdb.dbo.sp_send_dbmail 

	    @recipients = @emailid,

	    @subject = 'Request to Update Your Customer Details',

	    @body = @body,

	    @body_format = 'TEXT'
 

        fetch next from mycurs into @surname, @emailid

end

close mycurs

deallocate mycurs

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Author Closing Comment

by:Paduwan
ID: 31565181
Thanks x-com that code works a treat!
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