2020-04-03 13:23:32 +00:00
|
|
|
|
---
|
2020-04-08 14:22:25 +00:00
|
|
|
|
machine_translated: true
|
|
|
|
|
machine_translated_rev: b111334d6614a02564cf32f379679e9ff970d9b1
|
|
|
|
|
toc_priority: 38
|
|
|
|
|
toc_title: SHOW
|
2020-04-03 13:23:32 +00:00
|
|
|
|
---
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
# 显示查询 {#show-queries}
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
## SHOW CREATE TABLE {#show-create-table}
|
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW CREATE [TEMPORARY] [TABLE|DICTIONARY] [db.]table [INTO OUTFILE filename] [FORMAT format]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
返回单 `String`-类型 ‘statement’ column, which contains a single value – the `CREATE` 用于创建指定对象的查询。
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
## SHOW DATABASES {#show-databases}
|
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW DATABASES [INTO OUTFILE filename] [FORMAT format]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
打印所有数据库的列表。
|
|
|
|
|
这个查询是相同的 `SELECT name FROM system.databases [INTO OUTFILE filename] [FORMAT format]`.
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
## SHOW PROCESSLIST {#show-processlist}
|
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW PROCESSLIST [INTO OUTFILE filename] [FORMAT format]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-30 18:19:18 +00:00
|
|
|
|
输出的内容 [系统。流程](../../operations/system-tables.md#system_tables-processes) 表,包含目前正在处理的查询列表,除了 `SHOW PROCESSLIST` 查询。
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
该 `SELECT * FROM system.processes` 查询返回有关所有当前查询的数据。
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
提示(在控制台中执行):
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` bash
|
|
|
|
|
$ watch -n1 "clickhouse-client --query='SHOW PROCESSLIST'"
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## SHOW TABLES {#show-tables}
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
显示表的列表。
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW [TEMPORARY] TABLES [{FROM | IN} <db>] [LIKE '<pattern>' | WHERE expr] [LIMIT <N>] [INTO OUTFILE <filename>] [FORMAT <format>]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
如果 `FROM` 如果未指定子句,则查询返回当前数据库中的表列表。
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
你可以得到相同的结果 `SHOW TABLES` 通过以下方式进行查询:
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SELECT name FROM system.tables WHERE database = <db> [AND name LIKE <pattern>] [LIMIT <N>] [INTO OUTFILE <filename>] [FORMAT <format>]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
**示例**
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
下面的查询从表的列表中选择前两行 `system` 数据库,其名称包含 `co`.
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW TABLES FROM system LIKE '%co%' LIMIT 2
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
``` text
|
|
|
|
|
┌─name───────────────────────────┐
|
|
|
|
|
│ aggregate_function_combinators │
|
|
|
|
|
│ collations │
|
|
|
|
|
└────────────────────────────────┘
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## SHOW DICTIONARIES {#show-dictionaries}
|
|
|
|
|
|
2020-04-30 18:19:18 +00:00
|
|
|
|
显示列表 [外部字典](../../sql-reference/dictionaries/external-dictionaries/external-dicts.md).
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW DICTIONARIES [FROM <db>] [LIKE '<pattern>'] [LIMIT <N>] [INTO OUTFILE <filename>] [FORMAT <format>]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
如果 `FROM` 如果未指定子句,则查询从当前数据库返回字典列表。
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
你可以得到相同的结果 `SHOW DICTIONARIES` 通过以下方式进行查询:
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SELECT name FROM system.dictionaries WHERE database = <db> [AND name LIKE <pattern>] [LIMIT <N>] [INTO OUTFILE <filename>] [FORMAT <format>]
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
**示例**
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
下面的查询从表的列表中选择前两行 `system` 数据库,其名称包含 `reg`.
|
2020-04-03 13:23:32 +00:00
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SHOW DICTIONARIES FROM db LIKE '%reg%' LIMIT 2
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
``` text
|
|
|
|
|
┌─name─────────┐
|
|
|
|
|
│ regions │
|
|
|
|
|
│ region_names │
|
|
|
|
|
└──────────────┘
|
|
|
|
|
```
|
|
|
|
|
|
2020-04-08 14:22:25 +00:00
|
|
|
|
[原始文章](https://clickhouse.tech/docs/en/query_language/show/) <!--hide-->
|