Oracle SQL for beginners Training Course

Relational database models

• Structure of a relational database
• Types of table connections
• Database normalization and denormalization
• Relational operators

Extracting data

• Rules for writing SQL queries
• SELECT statement syntax
• Selecting all columns
• Queries involving arithmetic operations
• Column aliases
• Literals
• Concatenation operator

Filtering results

• The WHERE clause
• Comparison operators
• LIKE condition
• BETWEEN ... AND condition
• IS NULL condition
• IN condition
• Boolean operators: AND, OR, and NOT
• Multiple conditions in the WHERE clause
• Operator precedence
• DISTINCT clause

Sorting Data

• The ORDER BY clause
• Sorting by multiple columns or expressions

SQL functions

• Differences between single-row and multi-row functions
• Text, numeric, and date features
• Explicit and implicit type conversion
• Conversion functions
• Nesting functions
• Testing function performance using the DUAL table
• Retrieving the current date with the SYSDATE function
• Handling NULL values

Aggregating data using grouping

• Aggregate functions
• How aggregate functions handle NULL values
• Creating data groups using the GROUP BY clause
• Grouping by multiple columns
• Filtering group results with the HAVING clause

Retrieving data from multiple tables

• Types of joins
• Using NATURAL JOIN
• Table aliases
• Joins within the WHERE clause
• INNER JOIN
• Outer joins: LEFT, RIGHT, and FULL OUTER JOIN
• Cartesian product

Subqueries

• Using subqueries in the SELECT clause
• Single-row and multi-row subqueries
• Operators for single-row subqueries
• Grouping in subqueries
• Operators for multi-row subqueries: IN, ALL, ANY
• How NULL values are treated in subqueries

Set operators

• UNION operator
• UNION ALL operator
• INTERSECT operator
• MINUS operator

Inserting, updating, and deleting data

• INSERT command
• Copying data from another table
• UPDATE command
• DELETE command
• TRUNCATE command

Transactions

• COMMIT, ROLLBACK, and SAVEPOINT commands

DDL commands

• Key database objects
• Object naming conventions
• Creating tables
• Available data types for columns
• DEFAULT option
• NULL and NOT NULL constraints

Managing tables

• Referential integrity: CHECK, PRIMARY KEY, FOREIGN KEY, UNIQUE
• Creating a table from a query
• Dropping a table with DROP TABLE
• DESCRIBE command

Other schema objects

• Sequences
• Synonyms
• Views