John Butler wrote:
Can anyone see what must be a simple error in the way I am trying to construct the 2 WHERE clauses, below? (in the latter query)


These two columns in the two separate tables are of type TIMESTAMP:
solarLandingDateTime
solarAWDateTime

The values I am passing into the query are like so
var_dump($userPikStartDate); // string(10) "2009-08-04"
var_dump($userPikEndDate); // string(10) "2009-08-09"


This query works as expected and returns all my rows: (including ones where the 'solarLandingDateTime' or 'solarAWDateTime' column contains a TIMESTAMP like '2009-08-09 03:14:07'
--------
$query = "SELECT COUNT(*) AS `CountRows_UNIQdateTblDir`, date(solarLandingDateTime) AS `uniqueDate`, solarLandingDir AS `trackingDir`, 't7solar_landing' AS `tableAlias` FROM t7solar_landing GROUP BY date(solarLandingDateTime), solarLandingDir UNION ALL SELECT count(*) AS `CountRows_UNIQdateTblDir`, date(solarAWDateTime) AS `uniqueDate`, solarAWfm_meta_adtracking AS `trackingDir`, 'aweber_7solar_aw' AS `tableAlias` FROM aweber_7solar_aw GROUP BY date(solarAWDateTime), solarAWfm_meta_adtracking ORDER BY uniqueDate DESC LIMIT 300";


But thisquery returns zero rows:
--------
$query = "SELECT COUNT(*) AS `CountRows_UNIQdateTblDir`, date(solarLandingDateTime) AS `uniqueDate`, solarLandingDir AS `trackingDir`, 't7solar_landing' AS `tableAlias` FROM t7solar_landing WHERE date(solarLandingDateTime) >= $userPikStartDate AND date(solarLandingDateTime) <= $userPikEndDate GROUP BY date(solarLandingDateTime), solarLandingDir UNION ALL SELECT count(*) AS `CountRows_UNIQdateTblDir`, date(solarAWDateTime) AS `uniqueDate`, solarAWfm_meta_adtracking AS `trackingDir`, 'aweber_7solar_aw' AS `tableAlias` FROM aweber_7solar_aw WHERE date(solarAWDateTime) >= $userPikStartDate AND date(solarAWDateTime) <= $userPikEndDate GROUP BY date(solarAWDateTime), solarAWfm_meta_adtracking ORDER BY uniqueDate DESC LIMIT 300";

echo mysql_error();


You will need to quote your timestamps:

.... where date(solarLandingDateTime) >= '" . mysql_real_escape_string($userPikStartDate) . "' AND date(solarLandingDateTime) <= '" . mysql_real_escape_string($userPikEndDate) . "' ....


If all else fails,

echo $query;

then copy it to mysql (either command line or something like phpmyadmin) and run it. What do you get?

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