SQL Tutorials

The SQL MINUS operator subtracts one result set from another. It is simple to use: Just place MINUS between two queries to exclude common records from the first set.

Learn how to query and filter a date greater than a specific date in SQL. Compare how the date greater than logic differs in MySQL, PostgreSQL, and SQL Server.

Integrity constraints in SQL are rules enforced on database tables to maintain data accuracy, consistency, and validity, such as ensuring unique primary keys and valid foreign key relationships.

The ROW_NUMBER() SQL function assigns sequential integers to rows within a result set, optionally partitioning the data and ordering the rows within each partition.

Review three methods to add comments in SQL: single-line comments, multiline comments, and inline comments using the following syntax: --, /*, and */.

Learn about NoSQL databases - why NoSQL, how they differ from relational databases, the different types, and design your own NoSQL database using MongoDB.

Learn about SQL DDL commands and how they help define and manage the structure of database objects.

Database normalization is an important process used to organize and structure relational databases. This process ensures that data is stored in a way that minimizes redundancy, simplifies querying, and improves data integrity.

Set operations in SQL are techniques for combining or comparing the results of two or more SELECT statements.

Learn more about Data Manipulation Language (DML), how it compares to DQL and DDL, and master DML commands including SELECT, INSERT, DELETE, and UPDATE.

An introductory article on how to perform machine learning using SQL statements in PostgresML.

Unlock the power of SQL CONTAINS for advanced text searches. Dive into logical operators, proximity searches, and wildcard uses for precise data analysis.