Oracle SQL for beginners Training Course

Relational Database Models

• Anatomy of a relational database
• Types of table connections
• Database normalization and denormalization
• Relational Operators

Retrieving Data

• Guidelines for crafting SQL queries
• SELECT statement syntax
• Retrieving all columns
• Queries involving arithmetic operations
• Column aliases
• Literals
• Concatenation operator

Filtering Results

• The WHERE clause
• Comparison operators
• LIKE condition
• BETWEEN ... AND criteria
• IS NULL condition
• IN condition
• Logical operators: AND, OR, and NOT
• Multiple conditions within 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 conversion
• Conversion functions
• Nested functions
• Testing function performance using the dual table
• Retrieving the current date with the SYSDATE function
• Managing NULL values

Data Aggregation via Grouping

• Grouping functions
• Handling of NULL values by grouping functions
• Creating data groups using the GROUP BY clause
• Grouping by multiple columns
• Filtering grouped results with the HAVING clause

Querying Multiple Tables

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

Subqueries

• Placing subqueries within the SELECT command
• Single-row and multi-row subqueries
• Operators for single-row subqueries
• Grouping features 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

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

Transactions

• COMMIT, ROLLBACK, and SAVEPOINT commands

DDL Commands

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

Table Management

• 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