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SQL query to email customers

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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reb73

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 ..

ASKER CERTIFIED SOLUTION

David H.H.Lee

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David H.H.Lee

Hi Paduwan,
Some amendment for @emailid:
@emailid varchar(100)

reb73

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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Paduwan

ASKER

Thanks x-com that code works a treat!