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The SHOW COLUMNS statement shows details about columns in a table, including each column's name, type, default value, and whether or not it's nullable.
Required Privileges
The user must have any privilege on the target table.
Synopsis
Parameters
| Parameter | Description |
|---|---|
table_name |
The name of the table for which to show columns. |
Response
The following fields are returned for each column.
| Field | Description |
|---|---|
Field |
The name of the column. |
Type |
The data type of the column. |
Null |
Whether or not the column accepts NULL. Possible values: true or false. |
Default |
The default value for the column, or an expression that evaluates to a default value. |
Indices |
The list of indexes that the column is involved in, as an array. |
Example
> CREATE TABLE orders (
id INT PRIMARY KEY DEFAULT unique_rowid(),
date TIMESTAMP NOT NULL,
priority INT DEFAULT 1,
customer_id INT UNIQUE,
status STRING DEFAULT 'open',
CHECK (priority BETWEEN 1 AND 5),
CHECK (status in ('open', 'in progress', 'done', 'cancelled')),
FAMILY (id, date, priority, customer_id, status)
);
> SHOW COLUMNS FROM orders;
+-------------+-----------+-------+----------------+----------------------------------+
| Field | Type | Null | Default | Indices |
+-------------+-----------+-------+----------------+----------------------------------+
| id | INT | false | unique_rowid() | {primary,orders_customer_id_key} |
| date | TIMESTAMP | false | NULL | {} |
| priority | INT | true | 1 | {} |
| customer_id | INT | true | NULL | {orders_customer_id_key} |
| status | STRING | true | 'open' | {} |
+-------------+-----------+-------+----------------+----------------------------------+
(5 rows)
