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The table sql_features contains information about which formal features defined in the SQL standard are supported by PostgreSQL . This is the same information that is presented in Appendix D . There you can also find some additional background information.
Table 32-30. sql_features Columns
| Name | Data Type | Description |
|---|---|---|
| feature_id | character_data | Identifier string of the feature |
| feature_name | character_data | Descriptive name of the feature |
| sub_feature_id | character_data | Identifier string of the subfeature, or a zero-length string if not a subfeature |
| sub_feature_name | character_data | Descriptive name of the subfeature, or a zero-length string if not a subfeature |
| is_supported | character_data | YES if the feature is fully supported by the current version of PostgreSQL , NO if not |
| is_verified_by | character_data | Always null, since the PostgreSQL development group does not perform formal testing of feature conformance |
| comments | character_data | Possibly a comment about the supported status of the feature |