mysql - Selecting data where a column is maximum -

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मेरे पास नीचे की तरह एक MySQL तालिका है। 

  ID XYZ 1 1 1 2 2 4 2 2 9 4 3 3 2 3 1 4 2 2 1 4 2 2 2 3 3 1   
 मैं एक्स का चयन करना चाहता हूं जहां (आईडी = 2 और वाई = 4 और अधिकतम )। मैं यह कोड करता हूं लेकिन समझ नहीं पाया कि अधिकतम फ़ंक्शन कहां से जोड़ता है।  
  $ check_x = mysql_query ("एचडीडब्ल्यूएस से एक्सप्लेक्स एक्स जहां आईडी = '2' और वाई = '4'");   
 कृपया MySQL के साथ मेरी सहायता करें।   
 
 
 वहां पहले से ही सही था अगर आपको अधिकतम ज़ेड के साथ  केवल एक एक्स  की ज़रूरत होती है  
  Hamdun_Soft से SELECT X जहां आईडी = '2' और वाई = '4' ऑर्डर जेड डीईएससी की सीमा 1 < / अधिकतम कोड के साथ  न केवल एक एक्स  हो सकता है।  
  Hamdun_Soft से चुनें X जहां आईडी = '2' और वाई = '4' और जेड = (Hamdun_Soft से चुनें MAX (Z) जहां आईडी = '2' और वाई = '4')   
 पी। एस।  
 और मत भूलना कि  mysql _ *  फ़ंक्शन का फ़ैमिली अब नापसंद हो गया है। आप  mysqli _ *  या  PDO  का उपयोग कर सकते हैं।

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