Oracle SQL for beginners Training Course

Relational Database Models

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

Retrieving Data

• Best practices for writing SQL queries
• SELECT statement syntax
• Selecting all columns
• Performing arithmetic operations in queries
• Using column aliases
• Working with literals
• The concatenation operator

Filtering Results

• The WHERE clause
• Comparison operators
• The LIKE condition
• Filtering with BETWEEN ... AND
• The IS NULL condition
• The IN condition
• Boolean operators: AND, OR, and NOT
• Combining multiple conditions in the WHERE clause
• Operator precedence
• The 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 functions
• Explicit and implicit data conversion
• Conversion functions
• Nesting functions
• Testing function performance using the DUAL table
• The SYSDATE function for current date retrieval
• Handling NULL values

Data Aggregation and Grouping

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

Retrieving Data from Multiple Tables

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

Subqueries

• Placing subqueries within the SELECT command
• Single-row and multi-row subqueries
• Operators for single-row subqueries
• Using grouping in subqueries
• Operators for multi-row subqueries: IN, ALL, ANY
• Treatment of NULL values in subqueries

Set Operators

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

Inserting, Updating, and Deleting Data

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

Transactions

• Using COMMIT, ROLLBACK, and SAVEPOINT commands

DDL Commands

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

Table Management

• Referential integrity constraints: CHECK, PRIMARY KEY, FOREIGN KEY, UNIQUE
• Creating tables using a query
• Dropping tables with DROP TABLE
• The DESCRIBE command

Other Schema Objects

• Sequences
• Synonyms
• Views