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DESCRIBE TABLE

DESCRIBE TABLE [db.]table describes the table structure in the db or the current database in-use.

Examples

Describes the table monitor:

sql
DESCRIBE TABLE monitor;
sql
+--------+----------------------+------+---------+---------------+
| Field  | Type                 | Null | Default | Semantic Type |
+--------+----------------------+------+---------+---------------+
| host   | String               | YES  |         | PRIMARY KEY   |
| ts     | TimestampMillisecond | NO   |         | TIME INDEX    |
| cpu    | Float64              | YES  | 0       | VALUE         |
| memory | Float64              | YES  |         | VALUE         |
+--------+----------------------+------+---------+---------------+
4 rows in set (0.00 sec)

It produces the table structure:

  • Field: the column names
  • Type: the column types
  • Null: yes means nullable, otherwise no
  • Default: default value of the column
  • Semantic Type: the semantic type of column, such as TAG, VALUE,TIME INDEX or PRIMARY KEY.