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UNION Ö¸ÁîµÄÄ¿µÄÊǽ«Á½¸ö SQL Óï¾äµÄ½á¹ûºÏ²¢ÆðÀ´¡£´ÓÕâ¸ö½Ç¶ÈÀ´¿´£¬ UNION ¸ú JOIN ÓÐЩÐíÀàËÆ£¬ÒòΪÕâÁ½¸öÖ¸Á¿ÉÒÔÓɶà¸ö±í¸ñÖÐߢȡ×ÊÁÏ¡£ UNION µÄÒ»¸öÏÞÖÆÊÇÁ½¸ö SQL Óï¾äËù²úÉúµÄÀ¸Î»ÐèÒªÊÇͬÑùµÄ×ÊÁÏÖÖÀà¡£ÁíÍ⣬µ±ÎÒÃÇÓà UNIONÕâ¸öÖ¸Áîʱ£¬ÎÒÃÇÖ»»á¿´µ½²»Í¬µÄ×ÊÁÏÖµ (ÀàËÆ SELECT DISTINCT)¡£ unionÖ»Êǽ«Á½¸ö½á¹ûÁª½áÆðÀ´Ò»ÆðÏÔʾ£¬²¢²»ÊÇÁª½áÁ½¸ö±í………… UNION µÄÓï·¨ÈçÏ£º
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Store_Information ±í¸ñ
Sql´úÂë
store_name     Sales    Date  
Los Angeles   $1500  Jan-05-1999   
San Diego     $250   Jan-07-1999   
Los Angeles   $300   Jan-08-1999   
Boston       $700    Jan-08-1999  
store_name Sales Date
Los Angeles $1500 Jan-05-1999
San Diego $250 Jan-07-1999
Los Angeles $300 Jan-08-1999
Boston $700 Jan-08-1999
Internet Sales ±í¸ñ
Sql´úÂë
Date    Sales   
Jan-07-1999  $250   
Jan-10-1999  $535   
Jan-11-1999  $320   
Jan-12-1999  $750  
Date Sales
Jan-07-1999 $250
Jan-10-1999 $535
Jan-11-1999 $320
Jan-12-1999 $750
¶øÎÒÃÇÒªÕÒ³öÀ´ËùÓÐÓÐÓªÒµ¶î (sales) µÄÈÕ×Ó¡£Òª´ïµ½Õâ¸öÄ¿µÄ£¬ÎÒÃÇÓÃÒÔÏ嵀 SQL Óï¾ä£º
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SELECT Date from Store_Information   
UNION  
SELECT Date from Internet_Sales  
SELECT Date from Store_Information
UNION
SELECT Date from Internet_Sales
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Date
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Jan-05-1999  
Jan-07-1999  
Jan-08-1999  
Jan-10-1999  
Jan-11-1999  
Jan-12-1999  
Jan-05-1999
Jan-07-1999
Jan-08-1999
Jan-10-1999
Jan-11-1999
Jan-12-1999
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