What is the meaning of specialized and generalized entity?

If the identifying relationship set has a descriptive attribute, then the movement of an attribute will be on weak entity side? pls explain with proper reference

asked Sep 25, 2017 in Databases set2018 172 views

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what is the meaning of the data item actually when we write the statement READ(A) ?

I am having some confusion in understanding the meaning of the term data item . when we write READ(A) A=A-10 WRITE(A) Now I am unable to get one point here that when we have a file consisting of various blocks and those blocks consisting of various record and when we ... the entire block from the disk , but we write only this statement like : READ(A) , is this block or only a single attribute ?

asked Aug 28, 2015 in Databases radha gogia 176 views

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