Introduction to SQL.pptx
- 1. Introduction to SQL Structured Query Language
- 2. What is SQL? SQL is a short-form of the structured query language, and it is pronounced as S-Q-L or sometimes as See-Quell. It is database language used for manipulating data in relational database management system. We can easily create and manipulate the database, access and modify the table rows and columns, etc.
- 3. History of SQL It was first developed in the early 1970s at IBM by a team led by Donald D. Chamberlin and Raymond F. Boyce SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987
- 4. SQL is widely used in data science and analytics • The basic use of SQL is to insert, update, and delete the data from the relational database. • It allows SQL users to create, drop, and manipulate the database and its tables. • Big companies like Facebook, Instagram, and LinkedIn, use SQL for storing the data in the back-end.
- 5. Advantages of SQL Perfect query language which allows data professionals and users to communicate with the database. 1. No programming needed 2. High-Speed Query Processing 3. Standardized Language 4. Portability 5. Interactive language 6. More than one Data View
- 6. Disadvantages of SQL It has few disadvantages. 1. Cost 2. Interface is Complex 3. Partial Database control Overall sql has more advantages than disadvantages.
- 7. What is database? A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS)
- 9. DBMS – Database Management System
- 10. RBDMS – Relational Database Management system RDBMS is the basis for SQL, and for all modern database systems such as MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access. The data in RDBMS is stored in database objects called tables. A table is a collection of related data entries and it consists of columns and rows.
- 11. Non – RBDMS or NoSQL database • a database that does not use the tabular schema of rows and columns found in most traditional database systems • examples: MongoDB, Apache Cassandra, Redis, Couchbase and Apache Hbase • Stores unstructured and semi structured data like images,media files, documents.
- 12. Records and Fields. Field - A field is a column in a table that is designed to maintain specific information about every record in the table Record - A record, also called a row, is each individual entry that exists in a table. Record is horizontal Column is vertical