Question

I am struggling with a MySQL query. Here’s the problem:

SELECT * from sf_forecasts WHERE contentid='1234' AND fulldate='2012-12-13'

There is one record in my table that matches this criteria, and this query finds it with no difficulty. However, when I move to update it using this query…

UPDATE sf_forecasts
SET listingTitle ='Some Snow Resort', location ='49.23, -115.22'
WHERE contentid='1234' AND fulldate='2012-12-13'

…I always get a notice of “0 rows affected.” Strangely, the query is actually updating the record, but it’s only touching fields that are NULL. If my example record has a ‘location’ value of NULL, the query will update the data, but if it already contains a non-NULL value, the query will not change it, even though the query clearly contains new information.

What gives?

P.S. I am using a PRIMARY key of contentid+fulldate (b-tree, unique) if this matters.

P.S.S. Here is the ‘SHOW CREATE TABLE sf_forecasts’ results as requested below:

sf_forecasts    CREATE TABLE `sf_forecasts` (
`contentid` int(11) NOT NULL,
`fulldate` varchar(10) COLLATE utf8_unicode_ci NOT NULL,
`listingTitle` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`location` varchar(10) COLLATE utf8_unicode_ci NOT NULL,
`dayofmonth` smallint(2) NOT NULL,
`dayofweek` varchar(10) COLLATE utf8_unicode_ci NOT NULL,
`minTempF` smallint(4) NOT NULL,
`maxTempF` smallint(4) NOT NULL,
`minTempC` smallint(4) NOT NULL,
`maxTempC` smallint(4) NOT NULL,
`skyCondition` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`precip` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`snowPotential` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`wind` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`minTempF_custom` smallint(4) DEFAULT NULL,
`maxTempF_custom` smallint(4) DEFAULT NULL,
`minTempC_custom` smallint(4) DEFAULT NULL,
`maxTempC_custom` smallint(4) DEFAULT NULL,
`baseH_custom` smallint(4) DEFAULT NULL,
`baseL_custom` smallint(4) DEFAULT NULL,
`topH_custom` smallint(4) DEFAULT NULL,
`topL_custom` smallint(4) DEFAULT NULL,
`skyCondition_custom` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`precip_custom` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`snowPotential_custom` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`wind_custom` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`icon` varchar(30) COLLATE utf8_unicode_ci NOT NULL,
`icon_custom` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL,
`shortrange_custom` varchar(5000) COLLATE utf8_unicode_ci DEFAULT NULL,
`longrange_custom` varchar(5000) COLLATE utf8_unicode_ci DEFAULT NULL,
`scCode` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
`scUpdate` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
`lastUpdate` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
`skys` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`contentid`,`fulldate`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

Answer 1

The issue is with difference in datatype length defined and length of data being updated

Your location is varchar(10) and you are trying to insert 14 characters