意義的大型mysql命令

Question

任何人都可以通過描述這個PHP MySQL命令請幫助： -

SELECT itm.*,mem.username as username,cpn.* 
    FROM aw_rdw_items itm,members mem,aw_rdw_items_coupons cpn 
    WHERE itm.item_id=cpn.item_id 
     and item_special_type != 'g' 
     and itm.item_id=cpn.item_id 
     and itm.memberid=mem.memberid 
     and item like('%".addslashes($_REQUEST["item_name"])."%') 
     $prs1 $prs2 $greenget $subsql 
    ORDER BY Display_Order,itm.item_id ASC 

Answer 1

SELECT 
    itm.*, // all columns of table itm 
    mem.username as username, // column username and assign the values to a variable called username 
    cpn.* // columns of table con 
FROM aw_rdw_items itm, members mem, aw_rdw_items_coupons, cpn // tables where execute the research 
WHERE itm.item_id=cpn.item_id // various conditions 
    and item_special_type != 'g' 
    and itm.item_id=cpn.item_id 
    and itm.memberid=mem.memberid 
    and item like('%".addslashes($_REQUEST["item_name"])."%') // item must contain the specified variable 
    $prs1 $prs2 $greenget $subsql // some php variables 
ORDER BY Display_Order, itm.item_id ASC // order by Dispay_Order and itm.item_id in ascendant mode 

Answer 2

返回所有記錄誰item_special_type是從"g"和item不同包含item_name請求值值。

Where子句中包含另一個條件，包含$prs1,$prs2,$greenget和$subsql變量。