Oracle SQL for beginners Training Course

Relational Database Models

• Anatomy of a relational database
• Types of table relationships
• Database normalization and denormalization
• Relational operators

Retrieving Data

• Best practices for writing SQL queries
• SELECT statement syntax
• Retrieving all columns
• Performing arithmetic operations in queries
• Using column aliases
• Working with literals
• String concatenation operators

Filtering Results

• The WHERE clause
• Comparison operators
• The LIKE condition
• The BETWEEN ... AND condition
• 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

Data Sorting

• 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
• Retrieving the current date with SYSDATE
• 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 group results with the HAVING clause

Multi-Table Data Retrieval

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

Subqueries

• Placing subqueries within SELECT commands
• Single-row vs. multi-row subqueries
• Operators for single-row subqueries
• Grouping within subqueries
• Operators for multi-row subqueries: IN, ALL, ANY
• Handling NULL values in subqueries

Set Operators

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

Data Manipulation: Insert, Update, and Delete

• The INSERT command
• Copying data from other tables
• The UPDATE command
• The DELETE command
• The TRUNCATE command

Transactions

• Managing transactions with COMMIT, ROLLBACK, and SAVEPOINT

DDL Commands

• Core database objects
• Naming conventions for objects
• Creating tables
• Available data types for columns
• Using the DEFAULT option
• NULL and NOT NULL constraints

Table Management

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

Other Schema Objects

• Sequences
• Synonyms
• Views