upgrade_340()

1841function upgrade_340() {1842	global $wp_current_db_version, $wpdb;1843 1844	if ( $wp_current_db_version < 19798 ) {1845		$wpdb->hide_errors();1846		$wpdb->query( "ALTER TABLE $wpdb->options DROP COLUMN blog_id" );1847		$wpdb->show_errors();1848	}1849 1850	if ( $wp_current_db_version < 19799 ) {1851		$wpdb->hide_errors();1852		$wpdb->query( "ALTER TABLE $wpdb->comments DROP INDEX comment_approved" );1853		$wpdb->show_errors();1854	}1855 1856	if ( $wp_current_db_version < 20022 && wp_should_upgrade_global_tables() ) {1857		$wpdb->query( "DELETE FROM $wpdb->usermeta WHERE meta_key = 'themes_last_view'" );1858	}1859 1860	if ( $wp_current_db_version < 20080 ) {1861		if ( 'yes' === $wpdb->get_var( "SELECT autoload FROM $wpdb->options WHERE option_name = 'uninstall_plugins'" ) ) {1862			$uninstall_plugins = get_option( 'uninstall_plugins' );1863			delete_option( 'uninstall_plugins' );1864			add_option( 'uninstall_plugins', $uninstall_plugins, null, false );1865		}1866	}1867}