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Learning Posts
Browse simple, visual and beginner-friendly lessons for SQL, Excel, Python and Power BI.
Topic
A beginner-friendly guide to the SQL DELETE statement, with SQL Server-friendly examples for removing rows from a table safely.
4 min read
A beginner-friendly guide to the SQL UPDATE statement, with SQL Server-friendly examples for changing existing values inside a table.
4 min read
A beginner-friendly guide to the SQL INSERT statement, with SQL Server-friendly examples for adding new rows into a table.
5 min read
A beginner-friendly guide to the SQL HAVING clause, with SQL Server-friendly examples for filtering grouped query results after GROUP BY.
5 min read
A beginner-friendly guide to the SQL ORDER BY clause, with SQL Server-friendly examples for sorting query results in ascending and descending order.
5 min read
A beginner-friendly guide to the SQL GROUP BY clause, with SQL Server-friendly examples using COUNT and SUM.
5 min read
A beginner-friendly guide to using JOIN inside a SELECT query to read related data from multiple tables in SQL Server.
5 min read
A beginner-friendly guide to the SQL WHERE clause, including how to filter rows using text and number conditions in SQL Server.
4 min read
A beginner-friendly guide to using SELECT and FROM together to read specific columns from a table in SQL Server.
4 min read
A beginner-friendly guide to Data Manipulation Language, common DML commands, and how DML is used to read, add, update, and delete table data.
6 min read
A beginner-friendly guide to the SQL DROP TABLE statement, how it removes a table completely, and how it differs from TRUNCATE TABLE.
4 min read
A beginner-friendly guide to using TRUNCATE TABLE in SQL Server to remove all rows from a table while keeping the table structure.
5 min read
A beginner-friendly guide to ALTER TABLE in SQL, including how to add, change, and remove columns from an existing table.
5 min read
A beginner-friendly guide to the SQL CREATE TABLE statement, including table planning, column names, data types, and a SQL Server-friendly example.
5 min read
A beginner-friendly guide to Data Definition Language, common DDL commands, and how DDL is used to create and manage database structure.
5 min read
A beginner-friendly guide to the SQL UPDATE statement, including basic syntax, WHERE conditions, and a practical SQL Server-style example.
6 min read
A beginner-friendly guide to the SQL DELETE statement, including basic syntax, WHERE conditions, and a practical SQL Server-style example.
5 min read
A beginner-friendly guide to the SQL INSERT statement, including basic syntax, inserting a new row, and checking the updated table.
5 min read
A beginner-friendly guide to the SQL SELECT statement, including basic syntax, choosing columns, sample output, and why selecting only needed columns is a better habit.
5 min read
A beginner-friendly guide to SQL operators, including comparison, logical, pattern, range, list, and null-check operators with SQL Server-friendly examples.
7 min read
A beginner-friendly guide to SQL data types, why they matter, common data type groups, and how to use SQL Server data types when creating table columns.
8 min read
A beginner-friendly guide to SQL keywords, what they do, and how SELECT, FROM, and WHERE are used to build simple SQL Server queries.
6 min read
A beginner-friendly comparison of SQL and NoSQL databases, including structure, schema, relationships, examples, and when to choose each type.
7 min read
Learn what an RDBMS is, why it is useful, where it works well, and when it may not be the best database choice.
4 min read
A beginner-friendly introduction to relational databases, tables, rows, columns, relationships, and how SQL connects related data.
5 min read