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   1  --
   2  -- Create the new redirect table.
   3  -- For each redirect, this table contains exactly one row defining its target
   4  --
   5  CREATE TABLE /*$wgDBprefix*/redirect (
   6    -- Key to the page_id of the redirect page
   7    rd_from int unsigned NOT NULL default '0',
   8  
   9    -- Key to page_namespace/page_title of the target page.
  10    -- The target page may or may not exist, and due to renames
  11    -- and deletions may refer to different page records as time
  12    -- goes by.
  13    rd_namespace int NOT NULL default '0',
  14    rd_title varchar(255) binary NOT NULL default '',
  15  
  16    PRIMARY KEY rd_from (rd_from),
  17    KEY rd_ns_title (rd_namespace,rd_title,rd_from)
  18  ) /*$wgDBTableOptions*/;
  19  
  20  -- Import existing redirects
  21  -- Using ignore because some of the redirect pages contain more than one link
  22  INSERT IGNORE
  23    INTO /*$wgDBprefix*/redirect (rd_from,rd_namespace,rd_title)
  24    SELECT pl_from,pl_namespace,pl_title
  25      FROM /*$wgDBprefix*/pagelinks, /*$wgDBprefix*/page
  26      WHERE pl_from=page_id AND page_is_redirect=1;
  27  
  28