SQL, or the structured query language, is a specialized programming language designed for working with databases. There are a few different variations of SQL from different organizations and projects, ...

SQL JOINs make it easy to find and fix missing data Your email has been sent Many people are confused by various JOIN operations supported by SQL. Learn to master the SQL command line with this crash ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

Query - Using the table playground.views, write a SQL query to identify all viewers who viewed more than one article on the same day. The table includes columns viewer_id (the ID of the viewer), ...