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GSM was developed using digital technology. It has an ability to carry 64 kbps to 120 Mbps of data rates. Presently GSM supports more than one billion mobile subscribers in more than 210 countries throughout the world. GSM provides basic to advanced voice and data services including roaming service.
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Alter is used to modify an existing table, like adding a row or column. Alter preserves the existing data. Example, deleting a column won't affect the data in the other columns. Changing a column datatype will result in conversion of existing data, which may result in data loss when there are errors such as overflows, under flows, or integrity constraint violations.
Drop is used to remove a table completely. You can drop and then recreate a table, but you will lose all the data it. If that's an issue, then Alter is the preferred solution. However, not all changes you might want to a table definition can be done with Alter, so your only option might be to drop/create.
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Mobile is subgroup from wireless. Wireless refers to the method of transferring information between a computing device, such as a personal data assistant (PDA), and a data source, such as an agency database server, without a physical connection.
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Ft.Pahadi Bisht 4 years, 6 months ago
3Thank You