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Warning:
As of October 4, 2019, CockroachDB v2.0 is no longer supported. For more details, refer to the Release Support Policy.
The DROP CONSTRAINT statement is part of ALTER TABLE and removes Check and Foreign Key constraints from columns.
Note:
For information about removing other constraints, see Constraints: Remove Constraints.Synopsis
Required Privileges
The user must have the CREATE privilege on the table.
Parameters
| Parameter | Description |
|---|---|
table_name |
The name of the table with the constraint you want to drop. |
name |
The name of the constraint you want to drop. |
Viewing Schema Changes
Whenever you initiate a schema change, CockroachDB registers it as a job, which you can view with SHOW JOBS.
Example
> SHOW CONSTRAINTS FROM orders;
+--------+---------------------------+-------------+-----------+----------------+
| Table | Name | Type | Column(s) | Details |
+--------+---------------------------+-------------+-----------+----------------+
| orders | fk_customer_ref_customers | FOREIGN KEY | customer | customers.[id] |
| orders | primary | PRIMARY KEY | id | NULL |
+--------+---------------------------+-------------+-----------+----------------+
> ALTER TABLE orders DROP CONSTRAINT fk_customer_ref_customers;
ALTER TABLE
> SHOW CONSTRAINTS FROM orders;
+--------+---------+-------------+-----------+---------+
| Table | Name | Type | Column(s) | Details |
+--------+---------+-------------+-----------+---------+
| orders | primary | PRIMARY KEY | id | NULL |
+--------+---------+-------------+-----------+---------+
See Also
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