Complete Oracle SQL Course: Learn from Basics to Advanced

Master arithmetic operators in Oracle SQL by manipulating salary data with plus and constants, using where clauses to filter, and apply multiplication has highest priority with brackets.

Learn how logical operators and, or, and not combine multiple conditions in Oracle 12c SQL, with examples showing when both conditions must be true versus either one.

Explore comparison operators, equal to, greater than, less than, and not equal to, and apply them in where and having clauses with salary and character data with single quotes.

Master set operators in Oracle SQL by combining results from multiple queries using union, union all, intersect, and minus; learn column count and data type matching across queries.

Learn how to use concatenation operators to join name and job fields in Oracle 12c SQL, using two pipelines and literals to insert spaces.

Master single row character functions in Oracle SQL, applying case manipulation (lower, initcap, upper) and string operations (concat, substring, length, instr, pad, trim) per row.

Learn to use Oracle 12c single row functions for numbers and dates, including modulus, truncate, round, next_day, last_day, add_months, months_between, and extract.

Explore Oracle 12c conversion functions and how implicit and explicit conversions handle number, date, and character data. Learn to use to_number, to_char, and to_date with formats for reporting.

Learn how to handle null values with single-row general functions like nvl, nvl2, nullif, and coalesce, and apply case and decode for conditional logic in sql queries.

Master group functions, including sum, min, max, count, and average, and learn to use group by and having clauses to compute aggregations and filter grouped results.

Explore the oracle sql categories ddl, dml, dcl, and tcl, and how ddl is auto committed while dml requires manual commits, with commands like insert, update, delete, merge, and select.

Master practical oracle 12c sql basics by implementing ddl and dml commands, creating and modifying tables, inserting, updating, deleting, truncating, and committing changes.

Learn how joins connect data from multiple tables using a common column, covering Cartesian product, equijoin, non equijoin, outer join, and self join with Oracle and SQL Server examples.

Explore SQL Server joins, including natural, inner, outer (left, right, full), and cross joins; learn how a common column enables Cartesian products and practical join patterns.

Explore subqueries in Oracle SQL, distinguishing single row and multiple row types, and use inner and outer queries with in and is equal to operators, including null handling.

Explore correlated subqueries in Oracle SQL, where the outer query feeds the inner, potentially degrading performance; learn to use exist and not exist operators to filter departments by employee presence.

Explore constraints in Oracle 12c, including not null, check, unique, primary key, and foreign key, and learn to define or modify not null constraints at column level via alter table.

Learn check constraints that enforce conditions on rows, such as age greater than 18 and balance greater than minimum balance, at column and table levels.

Explore unique key constraints by implementing them on single columns or across multiple columns (composite unique keys), preventing duplicate values while allowing nulls, and verify by table creation and modification.

Learn to define primary key constraints—single and composite keys, enforce not null and uniqueness, create and populate bank tables, and establish foreign key constraints with referential constraint.

Explain how the primary key constraint enforces unique and not null values, while the unique key constraint allows nulls, and a table has one primary key plus many unique keys.

Learn how to apply constraints to an existing Oracle 12c table: not null via alter table modify column, and for other constraints use add constraint; cascade drops dependencies.

Discover how views act as windows on tables to restrict columns and simplify queries. Learn to implement read-only views, with check option, and force views in Oracle 12c.

Explore how sequences generate unique numbers in Oracle 12c SQL, enabling primary key values with nextval and currval, and control through start with, increment by, max value, and cycle.

Explore synonyms in Oracle 12c: create private or public synonyms to access tables by short names across schemas, and learn how to drop them.

Explore how indexes boost database performance by accelerating data retrieval. Identify simple, composite, unique, reverse, bitmap, and b-tree indexes and their use in where clauses and ascending order.

Explore common Oracle 12c sql interview questions, covering sql basics, unions and subqueries, joins, constraints, ddl vs dml, and key database objects, with practical examples.