Dbms quries
- 1. UNIVERSITY OF GUJRAT LAHORE CAMPUS UNIVERSITY OF GUJRAT LAHORE CAMPUS A W O R L D C L A S S U N I V E R S I T Y Assignment No: 01 Submitted To: Sir Haroon Submitted By: Sayyed Ans Ali Date: 05-03-18 Topic Name: Basics of DBMS Roll No: 16181519-050 Section: (A) UNIVERSITY OF GUJRAT LAHORE CAMPUS H-8 Main Canal Bank Near Tajbagh Bridge Harbanspura Lahore. Ph: 042-99239145-7 Fax: 042-36551963 www.uoglahore.edu.pk
- 2. QUESTION #01 Data Dependence Data Independence 1)A data dependency in ‘CS’ is a situation in which a program instruction refers to the data of previous instruction. 1)Independence means the data is independent and there is no changes occurs in application program due to change in data. 2) Data dependence means the data is depends upon application program. when we make changes in data also changes occurs in application program in which we use Data. 3) The logical data independence Is the ability to modify logical table without making change in application program. Structured Data Un-Structured data • It is stored in organized way. • It is stored in un-organized in predefined manner. • Structured data is stored inside of a data warehouse where it can be pulled for analysis. • Unstructured data is more like human language. It doesn’t fit nicely into relational databases like sql, and searching it based on the old algorithms ranges from difficult to completely impossible. • Structured data is both highly-organized and easy to digest. • Unstructured data cannot simply be recorded in an Excel spreadsheet or data table, and requires more
- 3. specialized skills and tools to work with it. Data Information Facts and figures is called data. Possessed form of data is called information. An example of data is E- mail. This information may be in the form of text documents, images, audio clips, software programs, or other types of data. Data Meta-Data • Data is information processed or stored by a computer. • A data that describes and gives information about other data. • At its starting level , computer data is in the form of zeros and ones, known as binary data. • Meta is a prefix that in most IT usage means "Description." Row column • In DBMS ‘row’ is also called ‘record’ or ‘tuple’ • A column is a set of data values of a particular simple types. • For example, in a table called customer contact information, a row would likely contain fields such as: ID number, name, street • Column defines data in table the column data only contains a pointer or link to the actual file.
- 4. address, city, telephone number and so on. Question # 02 List Of 20 DATA-BASE Used In World 1. ORACLE RDBMS 2. IBM DB2 3. MY SQL 4. MICROSOFT 5. AMAZON 6. TERADATA 7. FILEMAKER 8. POSTGRE SQL 9. MONGODB 10. SAP ASE (SYBASE) 11. MICROSOFT ACCESS 12. INFORMIX 13. MARIA DB 14. SQLITE 15. MEMSQL 16. ADABAS 17. Dbase 18. FIREBIRD 19. ZENGINE 20. COUCHBASE
- 5. QUESTION # 03 WHY DATABASE IS BENEFICIAL OVER FILE MANAGEMENT • No redundant data in DBMS – Redundancy removed by data normalization. • Data stability and probity – data normalization takes care of it. • Secure – Each user has a different set of access to it. • Privacy – Limited access. • Easy access to data(data easily access by user or user friendly). • Easy recovery (backup of data). • Flexible.
- 6. QUESTION # 04 CASE-STUDY (Departmental store) EMPLOYEES(table) Emp-id varchar(30) Emp-name char(30) Emp-CNIC int(30) Emp-contact int(30) Emp-address varchar(30) Office-code varchar(30)(foreign key)
- 9. PAYMENT(table) Customer-no int(30) ORDERS(table) Order-no int(30) Order-Date int(30) Shipping-Date int(30) Customers-no int(20)
- 10. Payment-Date int(30) QUESTION # 05 DATABASE DESIGN FOR SCHOOL SCHOOL(table) School-Id School-Name Administrator Contact Location