Query Syntax - WHERE fieldname1='fieldvalue1' AND fieldname2='fieldvalue2'

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Query Syntax -



I have a syntax error when I am using an AND in the WHERE clause for a 
double field=value restriction



#1 RUNS OK

$query = "SELECT $field_name FROM classifieds WHERE $field_name = 
'$field_value'";



$result = mysql_query($query) or die(mysql_error());



#2 FAILS

$query = "SELECT $field_name FROM classifieds WHERE $field_name1 = 
'$field_value1' AND $field_name2 ='$field_value2'";



$result = mysql_query($query) or die(mysql_error());



dies with the following message:



Warning: mysql_query() [http://www.mysql.com/doc]: You have an error in your 
SQL syntax; check the manual that corresponds to your MySQL server version 
for the right syntax to use near 'FROM classifieds WHERE trans_type = 'For 
Sale' AND category ='Boats'' at line 1 in C:\apache2triad\htdocs\



Background: I call a function and pass a $field_name = $field_value pair. 
This works OK.  When I add a second field_name = $field_value pair the query 
dies.



Data excerpt from TABLE classifieds:

trans_type = Free
category = Books





Also, Can anyone recommend a good book on mySQL / php?  I could not find a 
good example of my problem in the online manual http://www.mysql.com/doc.



TIA

Mark

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