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  1. MariaDB Server
  2. MDEV-14873

ALTER TABLE DROP CONSTRAINT does not work for unique constraints

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      Description

      The syntax is supported in MariaDB 10.2.1 (https://mariadb.com/kb/en/library/alter-table/#drop-constraint), but it doesn't work for unique constraints:

      create table t (
        a int,
        b int,
        
        constraint x unique (a),
        constraint y check (b = 1)
      );
       
      -- Does not work:
      alter table t drop constraint x;
       
      -- These work:
      alter table t drop key x;
      alter table t drop constraint y;
      

      Note, this looks like a duplicate of MDEV-10038, but at the time of MDEV-10038, the syntax wasn't yet supported by MariaDB. Now it is. Feel free to close this as a duplicate of the other (and reopen the other), if you think that's the better approach.

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              Assignee:
              rucha174 Rucha Deodhar
              Reporter:
              lukas.eder Lukas Eder
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                Updated:
                Resolved:

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