Let’s see the stages of database system life cycle (DDLC) and their facts using tabular form −Stage of Database system development LifecycleExample of FactsExample of Documentation ProducedDatabase PlanningAims and objectives of database projects.Mission statements and objectives.System IdentificationDescription of major user views (Job roles, business application areas).Definition of scope and boundary ... Read More

The different phases of database development life cycle (DDLC) in the Database Management System (DBMS) are explained below −Requirement analysis.Database design.Evaluation and selection.Logical database design.Physical database design.Implementation.Data loading.Testing and performance tuning.Operation.Maintenance.Now, let us understand these phases one by one.Requirement AnalysisThe most important step in implementing a database system is to ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More

The aggregate functions are follows −max()min()sum()average()count()Consider the following tables −Employee − Emp(empid, ename, salary)EmpidEmpnameSalaryE1Ravi4000E2Sanjay3500E3Sruthi3000E4Alok3000E5Pritam3000Dept − Dept(deptid, dname)DepidDnameD1CseD2EceD3CivilProject − Project(projected, pname)ProjectidPnameP1DatabaseP2networkingWorksin − Worksin(empid, depid)EmpidDepidE1P1E2P2E3P1E4P2E5P2Assign − Assign(empid, projectid)EmpidProjectidE1P1E2P2E3P1E4P2E5P2Example 1Display the details of the employee who works in the ece department.Step 1Use the below mentioned syntax. Here, T1= deptid of EceT1=∏deptid(σdname=ece(dept))OutputDeptidD2Step 2Here, ⋈= ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More

Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.Query language is divided into two types −Procedural languageNon-procedural languageProcedural languageInformation is retrieved from the database by specifying the sequence of operations to be performed.For Example − Relational algebra.Structure Query ... Read More