Podcast
Questions and Answers
What SQL query would you use to delete a product with the Product Code P1004?
What SQL query would you use to delete a product with the Product Code P1004?
- UPDATE PRODUCT SET P_No = '0' WHERE P_No = 'P1004'
- UPDATE P_No = 'P1004' SET PRODUCT
- DELETE P_No = 'P1004' FROM PRODUCT;
- DELETE FROM PRODUCT WHERE P_No = 'P1004' (correct)
What action is the database designer taking when analyzing the environment and mission of the company?
What action is the database designer taking when analyzing the environment and mission of the company?
- Defining problems and constraints
- Defining scope and boundaries
- Defining objectives
- Analysing the company situation (correct)
At which stage of the database design cycle do you identify main processes and validate reports?
At which stage of the database design cycle do you identify main processes and validate reports?
- Entity Relationship Modelling
- Physical Design
- Database Analysis and Requirements (correct)
- Data Model Verification
What SQL command would you use to grant access rights to a table LECTURER to a new professor with the code GRET?
What SQL command would you use to grant access rights to a table LECTURER to a new professor with the code GRET?
What category of maintenance is involved in ensuring an incremental backup of the Organisation's Data every week and a full backup every month?
What category of maintenance is involved in ensuring an incremental backup of the Organisation's Data every week and a full backup every month?
How would you examine the current balance for a customer number 104 located in the CUSTOMER table?
How would you examine the current balance for a customer number 104 located in the CUSTOMER table?
What SQL command is used to delete a product with the Product Code P1004 from the table PRODUCT?
What SQL command is used to delete a product with the Product Code P1004 from the table PRODUCT?
What stage of the database design cycle involves defining problems and constraints?
What stage of the database design cycle involves defining problems and constraints?
What is the correct query to retrieve the customer number and balance for a specific customer?
What is the correct query to retrieve the customer number and balance for a specific customer?
What phenomenon occurs when two transactions update a value at the same time, and the transaction for T1 is not committed before T2 transaction is committed?
What phenomenon occurs when two transactions update a value at the same time, and the transaction for T1 is not committed before T2 transaction is committed?
Which type of lock is mostly used in multiuser database management systems (DBMS)?
Which type of lock is mostly used in multiuser database management systems (DBMS)?
What is an inaccurate change affecting database development and design?
What is an inaccurate change affecting database development and design?
What is the problem brought about by the growing number of remote locations over greater distances for a centralized database management system?
What is the problem brought about by the growing number of remote locations over greater distances for a centralized database management system?
What problem is associated with a company that depends on a central database?
What problem is associated with a company that depends on a central database?
What is an advantage of a distributed database management system?
What is an advantage of a distributed database management system?
What is the main issue with a centralized database management system?
What is the main issue with a centralized database management system?
Study Notes
Database Administration and Design
- To delete a product from the
Producttable, the correct query isDELETE FROM PRODUCT WHERE P_No = 'P1004'; - A database designer analyzing the company's situation and mission is performing the action of Analyzing the company situation
Database Design Cycle
- Identifying main processes and validating reports is performed during the Database Analysis and Requirements stage
Database Security
- To grant access rights to a table
LECTURERto a new professor with codeGRET, the correct command isGRANT USE OF TABLE LECTURER TO GRET;
Database Maintenance
- Ensuring incremental backups every week and full backups every month is classified under Preventative Maintenance
SQL Queries
- To examine the current balance for a customer with number 104 in the
CUSTOMERtable, the best query isSELECT CUST_NUMBER, CUST_BALANCE FROM CUSTOMER WHERE CUST_NUMBER = 104;
Database Transactions
- When two transactions update a value at the same time, and the transaction for T1 is not committed before T2 transaction is committed, it is known as Lost Updates
Database Locking
- Page-level lock locks the entire disk page and is mostly used in multi-user database management systems (DBMS)
Database Development and Design
- Advanced network technologies is a social and technological change that has affected the development of database development and design
Centralized Database Management Systems
- One problem associated with a centralized database is Scalability problems
- One problem brought about by the growing number of remote locations over greater distances for a centralized database management system is Performance degradation
Distributed Database Management Systems
- One advantage of a distributed database management system is the Improved communication
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Description
Test your knowledge of SQL queries and database design concepts with these questions. Identify the correct query to delete a product from a table and define the role of a database designer.
