Same name in this branch
  1. 6.x includes/database.pgsql.inc \db_drop_primary_key()
  2. 6.x includes/database.mysql-common.inc \db_drop_primary_key()
Same name and namespace in other branches
  1. 7.x includes/database/database.inc \db_drop_primary_key()
  2. 8.9.x core/includes/database.inc \db_drop_primary_key()

Drop the primary key.

Parameters

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

$table: The table to be altered.

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.
5 calls to db_drop_primary_key()
system_update_6001 in modules/system/system.install
Add version id column to {term_node} to allow taxonomy module to use revisions.
system_update_6002 in modules/system/system.install
Increase the maximum length of variable names from 48 to 128.
system_update_6019 in 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_6022 in modules/system/system.install
Update files tables to associate files to a uid by default instead of a nid. Rename file_revisions to upload since it should only be used by the upload module used by upload to link files to nodes.
system_update_6043 in modules/system/system.install
Update table indices to make them more rational and useful.

File

includes/database.mysql-common.inc, line 394
Functions shared between mysql and mysqli database engines.

Code

function db_drop_primary_key(&$ret, $table) {
  $ret[] = update_sql('ALTER TABLE {' . $table . '} DROP PRIMARY KEY');
}