Scope resolution operator allows a program to reference an identifier in the global scope that is hidden by another identifier with the same name in the local scope.
- Packet data speed is higher in 3G, and it is up to 384 KBPS - Voice and sms speed is also 384 KBPS in 3G - 2G utilizes different switching techniques for voice and data, where as 3G uses single switching, irrespective of data - 3G has at least 2MB of data link of a mobile, where in 2G the data rate is in KBPS - 3G has WiMAX facility for faster VOIP and internet - 2G uses GSM TDMA technology with narrowband 200Khz. - 3G uses CDMA technology with broadband 5Mhz, with same frequency carrier and time.
Row Level Trigger : Row Level Trigger is fired each time row is affected by Insert, Update or Delete command. If statement doesn’t affect any row, no trigger action happens.
Statement Level Trigger : This kind of trigger fires when a SQL statement affects the rows of the table. The trigger activates and performs its activity irrespective of number of rows affected due to SQL statement.
There is a decent page in the php manual on the subject, in short mysql_pconnect() makes a persevering association with the database which implies a SQL join that don't close when the execution of your script closes. mysql_connect()provides just for the database new association while utilizing mysql_pconnect , the capacity would first attempt to locate a (relentless) connection that is as of now open with the same host, username and password. On the off chance that one is found, an identifier for it will be returned as opposed to opening another connection... the connection with the SQL server won't be terminated when the execution of the script ends. Rather, the link will stay open for future use.
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