Arenadata Postgres

The simplest way to work with PostgreSQL tables is to use the psql terminal client. This client allows you to enter data queries, pass them to PostgreSQL, and view the results. Queries can also be received from a file or command line arguments. Psql becomes available on each node of the ADPG cluster immediately after its installation.

PostgreSQL offers two types to store JSON data defined in RFC 7159: JSON and JSONB. To implement efficient query mechanisms for these data types, PostgreSQL also provides the JSONPath data type.

A common table expression (CTE) is a temporary result of an SQL statement that can be referenced in another SQL statement. CTEs allow you to split complex SQL queries into simpler parts.

A view is a named query stored in a database. PostgreSQL runs the query that defines the view every time the view is referenced. Views allow you to encapsulate the structure details of your tables, which might change as your application evolves, behind consistent interfaces.

ADPG uses roles to manage database access permissions. A role represents a database user or a group of database users. Roles can own database objects (for example, tables and functions) and allow access and actions on these objects (assign privileges).

PostgreSQL creates an execution plan for each query. Since the resulting plan is critical to performance, PostgreSQL includes a complex planner that chooses the best plan based on an estimated cost of each alternative option.

You can use the UNION, INTERSECT, and EXCEPT set operators to combine the results of two queries.

The dump technique allows you to create a file with SQL commands that recreates a database in the same state as it was at the time the dump was made.

You can use the XML data type to store XML data. For this data type, ADPG/PostgreSQL validates the input value structure and provides functionality to perform type-safe operations.

The bytea data type allows you to store variable-length binary strings. A binary string is a sequence of octets (bytes).