The SHOW CONSTRAINTS statement lists all named constraints as well as any unnamed CHECK constraints on a table.

Required privileges

The user must have any privilege on the target table.

Aliases

SHOW CONSTRAINT is an alias for SHOW CONSTRAINTS.

Synopsis

SHOW CONSTRAINT CONSTRAINTS FROM table_name

Parameters

Parameter Description
table_name The name of the table for which to show constraints.

Response

The following fields are returned for each constraint.

Field Description
table_name The name of the table.
constraint_name The name of the constraint.
constraint_type The type of constraint.
details The definition of the constraint, including the column(s) to which it applies.
validated Whether values in the column(s) match the constraint.

Example

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> CREATE TABLE orders (
    id INT PRIMARY KEY,
    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)
);
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> SHOW CONSTRAINTS FROM orders;
+------------+------------------------+-----------------+--------------------------------------------------------------------------+-----------+
| table_name |    constraint_name     | constraint_type |                                 details                                  | validated |
+------------+------------------------+-----------------+--------------------------------------------------------------------------+-----------+
| orders     | check_priority         | CHECK           | CHECK (priority BETWEEN 1 AND 5)                                         |   true    |
| orders     | check_status           | CHECK           | CHECK (status IN ('open':::STRING, 'in progress':::STRING,               |   true    |
|            |                        |                 | 'done':::STRING, 'cancelled':::STRING))                                  |           |
| orders     | orders_customer_id_key | UNIQUE          | UNIQUE (customer_id ASC)                                                 |   true    |
| orders     | primary                | PRIMARY KEY     | PRIMARY KEY (id ASC)                                                     |   true    |
+------------+------------------------+-----------------+--------------------------------------------------------------------------+-----------+
(4 rows)

See also



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