37.48. sql_features

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37.48. sql_features

37.48. `sql_features`

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 37.46. sql_features Columns

Column 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` `yes_or_no` `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

Column 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 yes_or_no

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

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37.48. sql_features

37.48. `sql_features`

Table 37.46. sql_features Columns

Column 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` `yes_or_no` `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

Column 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 yes_or_no

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

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Chapter 11. Indexes

Table of Contents

11.1. Introduction

11.2. Index Types

11.2.1. B-Tree
11.2.2. Hash
11.2.3. GiST
11.2.4. SP-GiST
11.2.5. GIN
11.2.6. BRIN

11.3. Multicolumn Indexes

11.4. Indexes and ORDER BY

11.5. Combining Multiple Indexes

11.6. Unique Indexes

11.7. Indexes on Expressions

11.8. Partial Indexes

11.9. Index-Only Scans and Covering Indexes

11.10. Operator Classes and Operator Families

11.11. Indexes and Collations

11.12. Examining Index Usage

Indexes are a common way to enhance database performance. An index allows the database server to find and retrieve specific rows much faster than it could do without an index. But indexes also add overhead to the database system as a whole, so they should be used sensibly.

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Chapter 11. Indexes

Table of Contents

11.1. Introduction

11.2. Index Types

11.2.1. B-Tree
11.2.2. Hash
11.2.3. GiST
11.2.4. SP-GiST
11.2.5. GIN
11.2.6. BRIN

11.3. Multicolumn Indexes

11.4. Indexes and ORDER BY

11.5. Combining Multiple Indexes

11.6. Unique Indexes

11.7. Indexes on Expressions

11.8. Partial Indexes

11.9. Index-Only Scans and Covering Indexes

11.10. Operator Classes and Operator Families

11.11. Indexes and Collations

11.12. Examining Index Usage

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3.7. Conclusion

PostgreSQL has many features not touched upon in this tutorial introduction, which has been oriented toward newer users of SQL . These features are discussed in more detail in the remainder of this book.

If you feel you need more introductory material, please visit the PostgreSQL web site for links to more resources.

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3.7. Conclusion

If you feel you need more introductory material, please visit the PostgreSQL web site for links to more resources.

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Database-PostgreSQL

37.48. sql_features

37.48. `sql_features`

37.48. sql_features

37.48. `sql_features`

Chapter 11. Indexes

Chapter 11. Indexes

Chapter 11. Indexes

Chapter 11. Indexes

3.7. Conclusion

3.7. Conclusion

3.7. Conclusion

3.7. Conclusion

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