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Hellow Dear
Without fixing a structure you can't make your database. Before making a database you have to fix sturucture
eg  A Student database
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Roll No  Numberic (10)
it means that Roll No is a filed that show you and Numeric value will be transfered / filled in this field and the length of value will be 10 not more than that
means ex. Value of Roll no is 103030011 Â
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nice and in easy answer...thanx sir
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