Oracle SQL for beginners Training Course

Relational Database Models

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

Data Retrieval

• Standards for writing SQL queries
• SELECT statement syntax
• Retrieving all columns
• Performing arithmetic operations in queries
• Column aliases
• Literals
• String concatenation operator

Filtering Results

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

Data Sorting

• ORDER BY clause
• Sorting by multiple columns or expressions

SQL Functions

• Distinguishing between single-row and multi-row functions
• Text, numeric, and date functions
• Explicit and implicit data type conversion
• Conversion functions
• Nesting functions
• Evaluating function performance using the dual table
• Retrieving the current date with SYSDATE
• Managing NULL values

Data Aggregation and Grouping

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

Querying Multiple Tables

• Types of join connectors
• Utilizing NATURAL JOIN
• Table aliases
• Performing joins in the WHERE clause
• INNER JOIN
• Outer joins: LEFT, RIGHT, and FULL OUTER JOIN
• Cartesian products

Subqueries

• Placing subqueries in the SELECT statement
• 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

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

Data Manipulation: Insert, Update, Delete

• INSERT command
• Copying data from other tables
• 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 tables via queries
• Deleting tables with DROP TABLE
• DESCRIBE command

Other Schema Objects

• Sequences
• Synonyms
• Views