On 2/29/2012 1:15 PM, Don Wieland wrote:
Little help...
In my mySQL query editor, I am trying to return a value of 0 when
there is no related rows from this query:
(select if(count(ip.payment_amount) IS NOT NULL,
count(ip.payment_amount) , 0) FROM tl_trans_pmt_items ip WHERE
t.transaction_id = ip.inv_id GROUP BY ip.inv_id) as d,
regardless of the combination I use, invalid relationships come back
as NULL - need to return 0 so I can use it in a math formula.
Probably simple - maybe ;-)
Don
I think you want the 'coalesce' function:
Syntax:
COALESCE(value,...)
Returns the first non-NULL value in the list, or NULL if there are no
non-NULL values.
URL: http://dev.mysql.com/doc/refman/5.1/en/comparison-operators.html
Examples:
mysql> SELECT COALESCE(NULL,1);
-> 1
Michael Heaney
JCVI
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