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hi totes welcome to tech TOCOM before we go and learn how to find out candidate key we want to understand what is closer of attribute okay it will be useful while finding out candidate key so lets learn what is closer of attribute first we will start with an example obviously here lets take a simple example okay and we have functional dependencies a determined B be determine D see determine B something like this well so now if we say what is closer of attribute it means for example closer of attribute a which is denoted by a plus so closer of attribute is the set of attributes which can be determined with this attribute a so the closure of attribute a will be set of attributes which can be determined with a so if we consider here in this particular given set of functional dependencies if you have a you can uniquely determine B ok so if you have a you can uniquely I mean from a you always you can determine a right if you have a you have a now you can determine B okay so if you have B