Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

²éÑ¯ÖØ¸´¼Ç¼µÄSQLÓï¾ä

SELECT tagid, tagname from uchome_mtag WHERE tagname IN (SELECT tagname from uchome_mtag GROUP BY tagname HAVING (COUNT(tagname) > 1)) ORDER BY tagname


Ïà¹ØÎĵµ£º

mysqlÖеÄSQL·ÖÎö¹¤¾ß

Another Look at MySQL 5.1's SQL Diagnostic Tools
http://dev.mysql.com/tech-resources/articles/mysql_51_diagnostic_tools.html Êý¾Ý¿âµÄÐÔÄܾö¶¨ÒòËØ£º
£¨1£©Êý¾Ý¿âµÄÉè¼Æ
£¨2£©SQL´úÂë ¿ÉÒÔÓÃÒÔϼ¸ÖÖ·½·¨À´½â¾öһЩÐÔÄÜÎÊÌ⣺
£¨1£©Ë÷Òý
£¨2£©Ë®Æ½·ÖÇø
£¨3£©ÁÐÊÊÓ¦µÄ±í
colum ......

sqlǶÌ××Ó²éѯ

×Ó²éѯ£º
ʹÓÃ×Ó²éѯµÄÔ­Ôò
1.Ò»¸ö×Ó²éѯ±ØÐë·ÅÔÚÔ²À¨ºÅÖС£
2.½«×Ó²éѯ·ÅÔڱȽÏÌõ¼þµÄÓÒ±ßÒÔÔö¼Ó¿É¶ÁÐÔ¡£
×Ó²éѯ²»°üº¬ ORDER BY ×Ӿ䡣¶ÔÒ»¸ö SELECT Óï¾äÖ»ÄÜÓÃÒ»¸ö ORDER BY ×Ӿ䣬
²¢ÇÒÈç¹ûÖ¸¶¨ÁËËü¾Í±ØÐë·ÅÔÚÖ÷ SELECT Óï¾äµÄ×îºó¡£
ORDER BY ×Ó¾ä¿ÉÒÔʹÓ㬲¢ÇÒÔÚ½øÐÐ Top-N ·ÖÎöʱÊDZØÐëµÄ¡£
3.ÔÚ×Ó² ......

SQL Server 2005µÄ°æ±¾

¡¶SQL Sever 2005 Êý¾Ý¿â»ù´¡¼°Ó¦Óü¼Êõ½Ì³ÌÓëʵѵ ¡·  ÖÜÆæ
SQL Server 2005µÄ°æ±¾£º
1.       SQL Server 2005 Enterprise Edition ÆóÒµ°æ(32λºÍ64λ)
ÊÊÓÃÓÚ³¬´óÐÍÆóÒµ¡£Enterprise Edition ÊÇ×îÈ«ÃæµÄSQL Server°æ±¾£¬Êdz¬´óÐÍÆóÒµµÄÀíÏëÑ¡Ôñ£¬Äܹ»Âú×ã×ÔÓµÄÒªÇ󡣸ð汾»¹Í ......

SQLÖеÄCASEʹÓ÷½·¨

Case¾ßÓÐÁ½ÖÖ¸ñʽ¡£¼òµ¥Caseº¯ÊýºÍCaseËÑË÷º¯Êý¡£
--¼òµ¥Caseº¯Êý
CASE sex
         WHEN '1' THEN 'ÄÐ'
         WHEN '2' THEN 'Å®'
ELSE 'ÆäËû' END
--CaseËÑË÷º¯Êý
CASE WHEN sex = '1' THEN 'ÄÐ'
     ......

SQL SERVERµÄÉ󼯹¦ÄÜ

      ÆôÓÃc2ÉóºËÃüÁîÈçÏ£º
      EXEC sp_configure 'c2 audit mode', '1' RECONFIGURE      
      SQL ServerÒÔ128KB´óСµÄ¿éΪµ¥Î»°ÑÊý¾ÝдÈë¸ú×ÙÎļþ¡£Òò´Ë£¬µ±SQL Server·ÇÕý³£Í£Ö¹Ê±£¬×î¶à¿ÉÄܶªÊ§128
......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ