Sql - Structured Query Language
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SQL is a special-purpose programming language designed to manage data in relational database management systems (RDBMS). It allows users to define, manipulate, and control access to data in databases. SQL statements are divided into two main categories: DDL (Data Definition Language) statements are used to define database objects like tables, while DML (Data Manipulation Language) statements are used to query and manipulate data like SELECT, INSERT, UPDATE, DELETE. SQL was developed in the 1970s by IBM researchers Donald D. Chamberlin and Raymond F. Boyce and was initially called SEQUEL.
Sql - Structured Query Language
- 2. DDL DML Outline History What is SQL Statement
- 3. SQL Structured Query Language Special-purpose programming language for working with sets of facts and the relationships between them. DML SQL DDL
- 4. History SQL Develop by IBM 1970s Donald D. Chamberlin and Raymond F. Boyce Initial version SEQUEL (Structured English Query Language)
- 5. DDL Data Definition Language CREATE an object (a table) in the database TRUNCATE deletes all data from a table ALTER modifies the structure of an existing object DROP delete an object
- 6. Data Manipulation Language DML INSERT Adds rows to an existing table UPDATE Modifies a set of existing table rows DELETE Removes existing rows from a table
- 7. INSERT
- 8. UPDATE
- 9. DELETE
- 10. Select Statement Tables Data What tables contain the data How data from different sources is related Criteria Which fields or calculations will produce the data Criteria that data must match to be included Whether and how to sort the results Data Retrieval
- 11. Select Statement Basic SELECT <field> FROM <table> WHERE <criterion>; Example SELECT name, address FROM student WHERE stuID=123;