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Table Handling
In RDBMS more than one table can be tackled at a time by using join operation. Join operation is a relational operation that causes 2 tables with a common domain to be joined into a single table or view. SQL states a join implicitly by referring the matching of common columns over which tables are connected in a WHERE clause. Two tables may be connected when each haves a column that shares a common domain with the other. The result of join operation is to be called a single table. Selected columns from all the tables are contained. Every row returned contains data from rows in the dissimilar input tables where values for the common columns match. A vital rule of table handling is that there should be one condition within the WHERE clause for every pair of tables being joined. Therefore if two tables are to be combined, one condition would be essential, but if three tables (X, Y, Z) are to be combined then two conditions would be necessary because there are two pairs of tables (X-Y and Y-Z) OR (X-Z and Y-Z), and so forth. There are various possible types of joins in relational database queries. Four types of join operations are define below:
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
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Inheritance Adjustment As in object oriented analysis and design terms inheritance defines a relationship between classes, where as one class shares structure or behaviour def
What is the full form of ODBC ? ODBC stands for Open Database Connectivity.
1. Create the tables for the play-scheme database as specified in the TMA. 2. Enter the data as given in the spreadsheet. 3. Create queries to retrieve specified information
While sorting, if the main storage available is not enough, the system writes data to an external help file. The SAP profile parameter, which determines DIR_SORTTMP
sql is relationally complete-justify
Introduction In large projects, we can have many different companies working together. Generally, the project or contract is awarded to one company (Principal Contractor), which
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