| coalesce() | Returns the first argument that is not null, while the remaining arguments from the first non-null argument are not evaluated |
| current_database() | Returns the current database’s name |
| current_schema() | Returns the schema’s name (first in the search path) |
| has_schema_privilege() | Checks whether the current user has specific privileges on a schema |
| nullif() | Replaces a given value with null if it matches a specific criterion |
| pg_get_expr() | Retrieves the internal form of an individual expression (such as the default value for a column) |
| pg_total_relation_size() | Retrieves the size of a table |
| pg_typeof() | Retrieves the data type of any given value |
| pg_encoding_to_char() | Converts an encoding internal identifier to a human-readable name |
| pg_get_indexdef() | Reconstructs the PostgreSQL command used to retrieve the definition of a specified index |
| pg_get_userbyid() | Retrieves that name of a user (role) given its unique identifier (OID) |
| pg_relation_is_publishable() | Determines whether a specified relation (table) can be published in a publication |
| pg_size_pretty() | Converts sizes in bytes into a human-readable format |
| pg_table_size() | Retrieves that size of a specific table, including its associated storage components but excluding indexes |
| pg_table_is_visible() | Checks whether a specified table (or other database object) is visible in the current schema search path |
| pg_get_constraintdef() | Retrieves the definition of a specific constraint in a human-readable format |
| pg_get_statisticsobjdef_columns() | Retrieves the definitions of columns associated with a specified statistics object |
| obj_description() | Returns the comment associated with a specific database object |
| col_description() | Retrieves the comment associated with a specified table column based on its name |
| shobj_description() | Retrieves the comment associated with a shared database object |
| pg_backend_pid() | Returns the process ID (PID) of Oxla’s node handling the current session |
