showAlter table (_, DropReference cname) = concat
    [ "ALTER TABLE "
    , escapeDBName table
    , " DROP FOREIGN KEY "
    , escapeDBName cname
    ]
showAlter table (_, DropReference cname) = concat
    [ "ALTER TABLE "
    , escapeDBName table
    , " DROP FOREIGN KEY "
    , escapeDBName cname
    ]
showAlter table (_, DropReference cname) = concat
    [ "ALTER TABLE "
    , escapeDBName table
    , " DROP FOREIGN KEY "
    , escapeDBName cname
    ]