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Relational database models

• Relational operators
• Characteristics of declarative SQL language
• SQL syntax
• Division language DQL, DML, DDL, DCL

Data Query Language

• SELECT queries.
• Aliases columns of tables
• Service date (DATE types, display functions, formatting)
• Group Features
• Combining internal and external tables (JOIN clause)
• UNION operator
• Nested Subqueries (the WHERE clause, the table name, column name)
• Correlated subqueries

Data Modification Language

• Inserting rows (INSERT clause)
• Inserting rows by request
• Variation of the rows (UPDATE)
• Delete rows (DELETE)

Data Definition Language

• Creating, altering and dropping objects (CREATE, ALTER, DROP)
• Creating tables using subquery (CREATE TABLE .... AS SELECT...)

CONSTRAINTS

• Options NULL and NOT NULL
• CONSTRAINT clause
• ENUM type
• type SET
• PRIMARY KEY condition
• UNIQUE condition
• FOREIGN KEY condition
• DEFAULT clause

Transactions

• The command COMMIT, ROLLBACK, SAVEPOINT