[Vtigercrm-commits] [vtiger development] #1514: SQL "!= null" isn't equivalent to "IS NOT NULL"

[vtiger development]

#1514: SQL "!= null" isn't equivalent to "IS NOT NULL"
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 Reporter:  nokes      |       Owner:  developer
     Type:  defect     |      Status:  new      
 Priority:  major      |   Milestone:  4.2.5    
Component:  vtigercrm  |     Version:  4.2.4rc3 
 Keywords:             |  
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 In /modules/Calendar/appointment.pinc, there are several SQL queries where
 values are compared against NULL using !=

 According to SQL92, "x != NULL" always evaluates to FALSE.

 I think what we want is "x IS NOT NULL", which returns TRUE or FALSE,
 depending on the value of x.

 hence, "!=" should be replaced with "IS NOT" in four places, within SQL
 queries. Patch to be attached.

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Ticket URL: <http://vtiger.fosslabs.com/cgi-bin/trac.cgi/ticket/1514>
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