function db_drop_unique_key

7.x database.inc	`db_drop_unique_key($table, $name)`
6.x database.pgsql.inc	`db_drop_unique_key(&$ret, $table, $name)`
6.x database.mysql-common.inc	`db_drop_unique_key(&$ret, $table, $name)`

Drop a unique key.

Parameters

$ret: Array to which query results will be added.

$table: The table to be altered.

$name: The name of the key.

Related topics

Schema API: A Drupal schema definition is an array structure representing one or more tables and their related keys and indexes. A schema is defined by hook_schema(), which usually lives in a modulename.install file.

6 calls to db_drop_unique_key()

system_update_6005 in drupal-6.x/modules/system/system.install: Add language to url_alias table and modify indexes.
system_update_6019 in drupal-6.x/modules/system/system.install: Reconcile small differences in the previous, manually created mysql and pgsql schemas so they are the same and can be represented by a single schema structure.
system_update_6032 in drupal-6.x/modules/system/system.install: profile_fields.name used to be nullable but is part of a unique key and so shouldn't be.
system_update_6043 in drupal-6.x/modules/system/system.install: Update table indices to make them more rational and useful.
system_update_6044 in drupal-6.x/modules/system/system.install: RC1 to RC2 index cleanup.

... See full list

File

drupal-6.x/includes/database.pgsql.inc, line 796: Database interface code for PostgreSQL database servers.

Code

function db_drop_unique_key(&$ret, $table, $name) {
  $name = '{' . $table . '}_' . $name . '_key';
  $ret[] = update_sql('ALTER TABLE {' . $table . '} DROP CONSTRAINT ' . $name);
}