Oracle SQL for beginners Training Course

Relational Database Models

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

Data Retrieval

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

Filtering Results

• The WHERE clause
• Comparison operators
• LIKE condition
• BETWEEN ... AND condition
• IS NULL condition
• IN condition
• Boolean operators: AND, OR, and NOT
• Combining 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-line and multi-line functions
• Text, numeric, and date function features
• Explicit and implicit data conversion
• Conversion functions
• Nested functions
• Function performance testing using the dual table
• Retrieving the current date with the SYSDATE function
• Handling NULL values

Data Aggregation Using Grouping

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

Retrieving Data from Multiple Tables

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

Subqueries

• Placing subqueries in 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
• NULL value handling 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

• Main database objects
• Object naming rules
• Creating tables
• Available data types for columns
• DEFAULT option
• NULL and NOT NULL options

Managing Tables

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

Other Schema Objects

• Sequences
• Synonyms
• Views