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版本:0.8

SHOW

SHOW 关键字提供数据库和表信息。

SHOW DATABASES

展示所有数据库:

SHOW DATABASES;
+---------+
| Schemas |
+---------+
| public |
+---------+
1 row in set (0.01 sec)

展示名称符合 LIKE 模式的数据库:

SHOW DATABASES LIKE 'p%';

根据 where 表达式展示数据库:

SHOW DATABASES WHERE Schemas='test_public_schema';

SHOW TABLES

展示所有表:

SHOW TABLES;
+---------+
| Tables |
+---------+
| numbers |
| scripts |
+---------+
2 rows in set (0.00 sec)

展示 test 数据库中的所有表:

SHOW TABLES FROM test;

展示名称符合 LIKE 模式的表:

SHOW TABLES like '%prometheus%';

根据 where 表达式展示表:

SHOW TABLES FROM test WHERE Tables='numbers';

SHOW FULL TABLES

SHOW FULL TABLES [IN | FROM] [DATABASE] [LIKE pattern] [WHERE query]

将会展示指定数据库(或者默认 public)中所有的表及其类型:

SHOW FULL TABLES;
+---------+------------+
| Tables | Table_type |
+---------+------------+
| monitor | BASE TABLE |
| numbers | TEMPORARY |
+---------+------------+
2 rows in set (0.00 sec)
  • Tables: 表的名称
  • Table_type: 表的类型,例如 BASE_TABLE, TEMPORARYVIEW 等等。

同样也支持 likewhere 查询:

SHOW FULL TABLES FROM public like '%mo%';
+---------+------------+
| Tables | Table_type |
+---------+------------+
| monitor | BASE TABLE |
+---------+------------+
1 row in set (0.01 sec)
SHOW FULL TABLES WHERE Table_type='BASE TABLE';
+---------+------------+
| Tables | Table_type |
+---------+------------+
| monitor | BASE TABLE |
+---------+------------+
1 row in set (0.01 sec)

SHOW CREATE TABLE

展示创建指定表的 CREATE TABLE 语句:

SHOW CREATE TABLE [table]

例如:

SHOW CREATE TABLE system_metrics;
+----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| system_metrics | CREATE TABLE IF NOT EXISTS `system_metrics` (
`host` STRING NULL,
`idc` STRING NULL,
`cpu_util` DOUBLE NULL,
`memory_util` DOUBLE NULL,
`disk_util` DOUBLE NULL,
`ts` TIMESTAMP(3) NOT NULL DEFAULT current_timestamp(),
TIME INDEX (`ts`),
PRIMARY KEY (`host`, `idc`)
)

ENGINE=mito
WITH(
regions = 1
) |
+----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  • Table: 表的名称
  • Create Table: 用于创建该表的 SQL