Full-Featured SQL

Do not be misled by the "Lite" in the name. SQLite has a full-featured SQL implementation, including:

• Tables, indexes, triggers, and views in unlimited quantity
• Up to 32K columns in a table and unlimited rows
• Multi-column indexes
• Indexes can use DESC and COLLATE
• Partial indexes
• Indexes On Expressions
• Clustered indexes
• Covering indexes
• CHECK, UNIQUE, NOT NULL, and FOREIGN KEY constraints.
• ACID transactions using BEGIN, COMMIT, and ROLLBACK
• Nested transactions using SAVEPOINT, RELEASE, and ROLLBACK TO
• Subqueries, including correlated subqueries
• Up to 64-way joins
• LEFT JOIN
• DISTINCT, ORDER BY, GROUP BY, HAVING, LIMIT, and OFFSET
• UNION, UNION ALL, INTERSECT, and EXCEPT
• A rich library of standard SQL functions
• Aggregate functions including DISTINCT aggregates
• Window functions
• UPDATE, DELETE, and INSERT (of course)
• Common table expressions including recursive common table expressions
• Row values
• UPSERT
• An advanced query planner
• Full-text search
• R-tree indexes
• JSON support
• The IS operator
• Table-valued functions
• REPLACE INTO
• VACUUM
• REINDEX
• The GLOB operator
• Hexadecimal integer literals
• The ON CONFLICT clause
• The INDEXED BY clause
• Virtual tables
• Multiple databases on the same database connection using ATTACH DATABASE
• The ability to add application-defined SQL functions, including aggregate and table-valued functions.
• Application-defined collating functions

There are many more features not listed above. SQLite may be small in size and have "Lite" in its name, but it is not lacking in capability.