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Explain DML with some examples?
DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples:• SELECT - retrieve data from the a database• INSERT - insert data into a table• UPDATE - updates existing data within a table• DELETE - deletes all records from a table, the space for the records remain• MERGE - UPSERT operation (insert or update)• CALL - call a PL/SQL or Java subprogram• EXPLAIN PLAN - explain access path to data
Relational and E-R Model There are three types of constraints on relational database that have: DOMAIN CONSTRAINT PRIMARY KEY CONSTRAINT INTEGRITY CONSTRAINT
The scenario You have been approached to design and implement a prototype of a distributed information system for a national car part retail outlet chain. The company comprises
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
Rearrange Classes and Operations Sometimes, the similar operation is defined across different classes and can easily be inherited from a familiar ancestor, but more often oper
sql is relationally complete-justify
While using extract datasets it is required to have a special workarea for interface False. It is not required to have a special workarea for interface
Data Mining 1. What is data mining? Write Data Mining applications. 2. Explain OLAP? Write the benefits of OLAP. 3. What are the key features of a Data Warehouse? 4. W
Horizontal Fragmentation- Horizontal fragmentation groups together the tuples in a relation that are collectively used by the main transactions. A horizontal fragment is produced b
What is an ERD?
Which is another name for weak entity? Child is another name of weak entity.
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