SHOW
SHOW 关键字提供数据库和表信息。
SHOW DATABASES
展示所有数据库：
sql
SHOW DATABASES;SHOW DATABASES;sql
+---------+
| Schemas |
+---------+
| public |
+---------+
1 row in set (0.01 sec)+---------+
| Schemas |
+---------+
| public |
+---------+
1 row in set (0.01 sec)展示名称符合 LIKE 模式的数据库：
sql
SHOW DATABASES LIKE 'p%';SHOW DATABASES LIKE 'p%';根据 where 表达式展示数据库：
sql
SHOW DATABASES WHERE Schemas='test_public_schema';SHOW DATABASES WHERE Schemas='test_public_schema';SHOW TABLES
展示所有表：
sql
SHOW TABLES;SHOW TABLES;sql
+---------+
| Tables |
+---------+
| numbers |
| scripts |
+---------+
2 rows in set (0.00 sec)+---------+
| Tables |
+---------+
| numbers |
| scripts |
+---------+
2 rows in set (0.00 sec)展示 test 数据库中的所有表：
sql
SHOW TABLES FROM test;SHOW TABLES FROM test;展示名称符合 LIKE 模式的表：
sql
SHOW TABLES like '%prometheus%';SHOW TABLES like '%prometheus%';根据 where 表达式展示表：
sql
SHOW TABLES FROM test WHERE Tables='numbers';SHOW TABLES FROM test WHERE Tables='numbers';SHOW CREATE TABLE
展示创建指定表的 CREATE TABLE 语句：
sql
SHOW CREATE TABLE [table]SHOW CREATE TABLE [table]例如：
sql
SHOW CREATE TABLE system_metrics;SHOW CREATE TABLE system_metrics;sql
+----------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 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 | 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
) |
+----------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+