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Aggregate functions
Example: Find the total number of employees.
SELECT COUNT (*) FROM EMP;
Example: //Find the minimum, maximum and average salaries of employees of department D1//.
SELECT MIN(SAL), MAX (SAL), AVG(SAL) FROM EMP
WHERE DEPTNO = 'D1' ;
You are required to implement integrity constraints within the database to enforce the following requirements: For Projects: Start date must be supplied. Start date cannot be i
What is difference among mysql_connect and mysql_pconnect? Mysql_connect() opens a new connection to the database while mysql_pconnect() opens persistent connection to the data
Control as a State Machine Engine First let us define the state machine: "the state machine is a machine which is an object but not an application object. It is a part of lang
Explain the challenges before an E-business management.
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
why are older data models are being replaced by new data models
Types Of Indexes One of the words used during the file organisation is the term index. In this part, let us describe this term in more detail. We find the index of keywords
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
project on dbms
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