Database System

Organized collection of inter-related data that models some aspect of the real-world (A. Pavlo)Things related are laid together; c.f., files are not l

AlgebraMathematical system consisting of \- Operands: variables or values from which new values can be constructed \- Operators: symbols denoting

MySQL is an SQL-based R-DBMSFree and open-source R-DBMS (under GPL) \- Owned by Oracle \- Commercial version of MySQL is also provided ( cf. commun

HGU 전산전자공학부 홍참길 교수님의 23-1 Database System 수업을 듣고 작성한 포스트이며, 첨부한 모든 사진은 교수님 수업 PPT의 사진 원본에 필기를 한 수정본입니다.

The SQL data-definition language (DDL) allows the specification of information about relations( table structure(schema) ), including:The schema for ea

🖥️ Designing a database Initial phase: characterize fully the data needs of the prospective database users(관점에서) Second phase: choose a data model (

🖥️ Motivating example Data is jumbled(뒤섞인) ➡️ create duplicates by the design Repetition of data → increases the size of database Data consistenc

Join operations take two relations and return another (one) relationA join is a Cartesian product that requires tuples in the two relations match \-

(b) Write a query that finds the name of each city whose population is greater than the population of all cities in the Africa continent(d) Write a qu

(a) (2 pt.) How many stores are found in the database? (b) (2 pt.) How many unique last names are found in the actor relation?(c) (2 pt.) According t