SQL, or Structured Query Language, is a language to talk to databases. It allows you to select specific data and to build complex reports. Today, SQL is a universal language o… See more

Fetch all columns from the countrytable: Fetch id and name columns from the citytable: Fetch city names sorted by the ratingcolumn in the default ASCending order: Fetc… See more

COMPARISON OPERATORS
Fetch names of cities that have a rating above 3: Fetch names of cities that are neither Berlin nor Madrid:
TEXT OPE… See more

INNER JOIN
JOIN (or explicitly INNER JOIN) returns rows that have matching values in both tables.
LEFT JOIN… See more

GROUP BY groupstogether rows that have the same values in specified columns. It computes summaries (aggregates) for each unique combination of values. See more