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How to find the difference between two dates in different rows for a unique combination of records ?

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I am building a small web application of online library and I want to find out the difference between issue date and Submission date of the books.
My sql table has 5 values
1) name
2) ID number
3) Issue date
4) Book
5) Submission Date.
please help me with the Sql Statement that i should use to solve this problem.

posted May 29, 2017 by Vikram Sharma

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