@ -55,7 +55,7 @@ This query retrieves the entire hierarchy of categories using a recursive CTE.
PostgreSQL has support for JSON and JSONB data types. JSON functions enable you to create, manipulate, and query JSON data directly in your SQL queries.
```sql
SELECT json_object('name', name, 'age', age) as json_data
SELECT json_build_object('name', name, 'age', age) as json_data
FROM users;
```
@ -95,4 +95,4 @@ CREATE INDEX idx_users_city ON users (city);
This command creates an index on the `city` column of the `users` table to speed up queries involving that column.
These advanced topics can help you become a highly skilled PostgreSQL user and tackle complex real-world problems effectively. As you become more comfortable with these advanced concepts, you will unleash the full power of SQL and PostgreSQL.
These advanced topics can help you become a highly skilled PostgreSQL user and tackle complex real-world problems effectively. As you become more comfortable with these advanced concepts, you will unleash the full power of SQL and PostgreSQL.