IBM RAMAC 350 hard disk is the first commercial disk developed in 1956 by IBM. you can see how fast the technology evolving around storage of data. Now you can move disk having TB’s in your pocket. Know about first disk of IBM RAMAC 350.
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grep command is used to find out the word from the file and pull those line to display on terminal. Everyone using grep command in different way for different data to pull for somehow same intent.
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What is Machine Learning? this is one of the populor niche technology in the data science , AI branch. There are a lot of question arise in you mind when you hear the term “Machine Learning”. Machine learning grew out of work in AI (Artificial Intelligence) and this is new capability of computers.
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Native SQL quey in Hibernate is powerful way of writing your own native sql query, in spite of relationship , Query Criteria, and HQL (Hibernate Query Language). If your relationship is well defined, then you can use HQL else you have to use your own database specific native sql query.
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Hibernate Query Language (HQL) is a query language in the Hibernate. If your relationship is well defined then you can use HQL else you have to you native query language which I mention in another post.
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Well, many-to-one is the type of relationship in Hibernate. This is child to parent relationship where many child can belongs to one parent. Here, you have to establishe relationship between two different entity/domain model class.
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Well, one-to-many is the type of relationship in Hibernate. This is parent child relationship where one parent can have many child. Here, you have to establishe relationship between two different entity/domain model class.
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Why Composite key required in database? when you have to combine multiple key and would like to form a primary key. or you can say when you want a primary key by combining of more than one key. And you know, primary key is unique and not nullable in database.
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In Hibernate, there are three states of any object as:
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