SHOW

SHOW 关键字提供数据库和表信息。

SHOW DATABASES

展示所有数据库：

sql

  1. SHOW DATABASES;

sql

  1. +---------+
  2. | Schemas |
  3. +---------+
  4. | public  |
  5. +---------+
  6. 1 row in set (0.01 sec)

展示名称符合 LIKE 模式的数据库：

sql

  1. SHOW DATABASES LIKE 'p%';

根据 where 表达式展示数据库：

sql

  1. SHOW DATABASES WHERE Schemas='test_public_schema';

SHOW TABLES

展示所有表：

sql

  1. SHOW TABLES;

sql

  1. +---------+
  2. | Tables  |
  3. +---------+
  4. | numbers |
  5. | scripts |
  6. +---------+
  7. 2 rows in set (0.00 sec)

展示 test 数据库中的所有表：

sql

  1. SHOW TABLES FROM test;

展示名称符合 LIKE 模式的表：

sql

  1. SHOW TABLES like '%prometheus%';

根据 where 表达式展示表：

sql

  1. SHOW TABLES FROM test WHERE Tables='numbers';

SHOW CREATE TABLE

展示创建指定表的 CREATE TABLE 语句：

sql

  1. SHOW CREATE TABLE [table]

例如：

sql

  1. SHOW CREATE TABLE system_metrics;

sql

  1. +----------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  2. | Table          | Create Table                                                                                                                                                                                                                                                                                            |
  3. +----------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  4. | system_metrics | CREATE TABLE IF NOT EXISTS system_metrics (
  5.   host STRING NULL,
  6.   idc STRING NULL,
  7.   cpu_util DOUBLE NULL,
  8.   memory_util DOUBLE NULL,
  9.   disk_util DOUBLE NULL,
  10.   ts TIMESTAMP(3) NOT NULL DEFAULT current_timestamp(),
  11.   TIME INDEX (ts),
  12.   PRIMARY KEY (host, idc)
  13. )
  14. ENGINE=mito
  15. WITH(
  16.   regions = 1
  17. ) |
  18. +----------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+