Download Database Management Systems by Raghu Ramakrishnan PDF

By Raghu Ramakrishnan

Database administration Systems offers entire and up to date assurance of the basics of database platforms. Coherent factors and sensible examples have made this one of many prime texts within the box. The 3rd variation maintains during this culture, improving it with simpler fabric.

The new version has been reorganized to permit extra flexibility within the means the direction is taught. Now, teachers can simply pick out whether or not they want to educate a path which emphasizes database program improvement or a path that emphasizes database structures concerns. New assessment chapters at the start of elements give the chance to bypass different chapters within the half if you happen to don't need the element.

extra functions and examples were extra through the ebook, together with SQL and Oracle examples. The utilized taste is additional greater via the 2 new database purposes chapters.

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If there are duplicate rows, there can be problems resolving which of two possible selections is the correct one. For most DBMSs, the user can specify that duplicate rows are not allowed, and if that is done, the DBMS will prevent the addition of any rows that duplicate an existing row. A second integrity rule of the traditional relational model is that column values must not be repeating groups or arrays. A third aspect of data integrity involves the concept of a null value. A database takes care of situations where data may not be available by using a null value to indicate that a value is missing.

See "DatabaseMetaData Overview," on page 449, and "ResultSetMetaData Overview," on page 783, for more information. In general, developers writing tools and drivers are the ones most likely to be concerned with metadata. Top Chapter 2. Basic Tutorial JDBC technology was designed to keep simple things simple. This means that the JDBC API makes everyday database tasks, such as simple SELECT statements, very easy. This chapter will walk you through examples of using the JDBC API to execute common SQL statements, letting you see for yourself how easy it is to use the basic JDBC API.

Since there is no WHERE clause to narrow down the rows from which to select, the following SQL statement selects the whole table. SELECT * FROM COFFEES The result, which is the entire table, will look similar to the following. Note that some DBMSs might show the rows in a different order. 99 SALES ----0 0 0 0 0 TOTAL ----0 0 0 0 0 The result above is what you would see on your terminal if you entered the SQL query directly to the database system. When we access a database through a Java application, as we will be doing shortly, we will need to retrieve the results so that we can use them.

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