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Add information_schema.statistics docs

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slvrtrn 2023-11-07 19:14:44 +01:00
parent f663228404
commit 94143ac002
1 changed files with 31 additions and 3 deletions
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docs/en/operations/system-tables/information_schema.md
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@ -18,12 +18,14 @@ SHOW TABLES FROM information_schema;
│ KEY_COLUMN_USAGE │
│ REFERENTIAL_CONSTRAINTS │
│ SCHEMATA │
| STATISTICS |
│ TABLES │
│ VIEWS │
│ columns │
│ key_column_usage │
│ referential_constraints │
│ schemata │
| statistics |
│ tables │
│ views │
└─────────────────────────┘
@ -32,11 +34,12 @@ SHOW TABLES FROM information_schema;
`INFORMATION_SCHEMA` contains the following views:
- [COLUMNS](#columns)
- [SCHEMATA](#schemata)
- [TABLES](#tables)
- [VIEWS](#views)
- [KEY_COLUMN_USAGE](#key_column_usage)
- [REFERENTIAL_CONSTRAINTS](#referential_constraints)
- [SCHEMATA](#schemata)
- [STATISTICS](#statistics)
- [TABLES](#tables)
- [VIEWS](#views)
Case-insensitive equivalent views, e.g. `INFORMATION_SCHEMA.columns` are provided for reasons of compatibility with other databases. The same applies to all the columns in these views - both lowercase (for example, `table_name`) and uppercase (`TABLE_NAME`) variants are provided.
@ -372,3 +375,28 @@ Columns:
- `delete_rule` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `table_name` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `referenced_table_name` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
## STATISTICS {#statistics}
Provides information about table indexes. Currently returns an empty result (no rows) which is just enough to provide compatibility with 3rd party tools like Tableau Online.
Columns:
- `table_catalog` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `table_schema` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `table_name` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `non_unique` [Int32](../../sql-reference/data-types/int-uint.md) — Currently unused.
- `index_schema` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `index_name` ([Nullable](../../sql-reference/data-types/nullable.md)([String](../../sql-reference/data-types/string.md))) — Currently unused.
- `seq_in_index` [UInt32](../../sql-reference/data-types/int-uint.md) — Currently unused.
- `column_name` ([Nullable](../../sql-reference/data-types/nullable.md)([String](../../sql-reference/data-types/string.md))) — Currently unused.
- `collation` ([Nullable](../../sql-reference/data-types/nullable.md)([String](../../sql-reference/data-types/string.md))) — Currently unused.
- `cardinality` ([Nullable](../../sql-reference/data-types/nullable.md)([Int64](../../sql-reference/data-types/int-uint.md))) — Currently unused.
- `sub_part` ([Nullable](../../sql-reference/data-types/nullable.md)([Int64](../../sql-reference/data-types/int-uint.md))) — Currently unused.
- `packed` ([Nullable](../../sql-reference/data-types/nullable.md)([String](../../sql-reference/data-types/string.md))) — Currently unused.
- `nullable` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `index_type` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `comment` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `index_comment` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `is_visible` ([String](../../sql-reference/data-types/string.md)) — Currently unused.
- `expression` ([Nullable](../../sql-reference/data-types/nullable.md)([String](../../sql-reference/data-types/string.md))) — Currently unused.