Ò»¸öSQL²éѯÓï¾ä
±íÐÅÏ¢ÈçÏÂid,name
1,b
2,a
3,c
4,b
Ïëдһ¸ösqlÓï¾ä²éѯ³öÈçϽá¹û
id,name
1,b
4,b
2,a
3,c
¾ÍÊÇnameÊý¾ÝÏàͬµÄ·Åµ½Ò»Æð£¬Ë³ÐòºÍ֮ǰ±íÀïµÄÊý¾Ý˳Ðò¾¡Á¿Ò»Ñù£¬ÎÒ²»ÖªµÀSQLÓï¾äÄܲ»ÄÜʵÏÖ£¬Èç¹ûÄÜʵÏÖÇëÖ¸µãһϡ£
SQL code:
declare @a table(id int,NAME varchar(20))
insert @a select 1,'b'
union all select 2,'a'
union all select 3,'c'
union all select 4,'b'
SELECT * from @a a ORDER BY (SELECT count(*) from @a WHERE NAME=a.name) DESC,id
--result
/*id NAME
----------- --------------------
1 b
4 b
2 a
3 c
£¨ËùÓ°ÏìµÄÐÐÊýΪ 4 ÐУ©
*/
SQL code:
select *
from tb t
order by
(select count(1) from tb where name=t.name) desc,
id
/**
id name
----------- ----
1
Ïà¹ØÎÊ´ð£º
³¡¾°ÈçÏ£º
¿Í»§°Ñ±¸·ÝºÃµÄÊý¾Ý¿â£¬·¢¸øÎÒ£¬ÎÒÔÚ±¾»ú»¹Ôºó£¬ÔËÐÐдºÃµÄ´æ´¢¹ý³Ì£¬±È½Ï¿ì£¬²¢ÇÒÔÚʵʩÄDZßÔËÐÐͬÑù±È½Ï¿ì¡£µ«Êǵ±ÊµÊ©ÔÚ¿Í»§ÄDZßÔËÐеÄʱºòËٶȾͷdz£µÄÂý£¬Ê±¼ä³¬³öÁ˳ÌÐòµÄʱ¼äÏÞÖÆ¡£Ô¶³ÌÔÚ¿Í»§ÄÇ ......
sqlÎÒÏëµÃµ½Ò»×Ö·û´®Îª:
sldkf|||sdeww
erkv|||rltdk
jemcl|||ligf
¾ÍÊÇ|||ºóÃæµÄ×Ö·ûÓÐʲôº¯ÊýÄܵõ½Âð£¿ÊÇÔÚsqlÓï¾äдµÄ£¬²»ÊÇÔÚÒ³ÃæÐ´µÄ£¬ÄÇλ¸ßÊÖÀ´Ö¸½ÌÏ£¬ÐÂÊÖ£¬Ð»Ð»
ÔνñÌì²»ÊÇдÁËô
select parsen ......
Êý¾Ý¿âÒªÔõôѧ²Å²»»áÏԵóéÏó°¡£¿
Õâ¾ÍÒª¿´ÄãÊʺÏʲô·½·¨ÁË£¬Õâ¾ßÌå²»ºÃ˵µÄ.....
ÔõôÁË£¬ÄѵÀ´ó¼Ò¶¼²»»á£¬»¹ÊÇÕæµÄÌ«³éÏó´ó¼Ò²»ÖªµÀÔõô˵°¡
½áºÏÄã²Ù×÷Êý¾Ý¿âµÄÌå»áºÍÀí½â£¬Ó¦¸ÃЧ¹û»á¸üºÃ¡£·ñÔò£¬Ò ......
¿ÉÄÜÒòΪ¹¤×÷µÄÔÒò ½Ó´¥Êý¾Ý¿âÕâ¿é±È½ÏÉÙ£¬Ö®Ç°¶¼ÊÇ×ö³ÌÐòÕâ¿é£¬Êý¾Ý¿âÕâ¿é¶¼ÓÐרÃŵÄÈËÀ´×ö ·Ö¹¤¶¼ºÜÃ÷ϸ ËùÒÔ¶ÔÊý¾Ý¿âÕâÒ»¿éÍêÈ«²»Á˽⡣ǰ¶Îʱ¼ä È¥ÃæÊÔÁ˼¸¼Ò¹«Ë¾ ¼¸ºõ¶¼ÊÇÔÚÊý¾Ý¿âÕâ¿é¹ÒµôµÄ Á¬¸ö¼òµ¥µÄSQ ......
ÎÒÃÇC#×öÒ»¸ö´°Ìå ÍùÊý¾Ý¿âÀï²åÈëÊý¾Ý
SqlConnection cn = new SqlConnection("Data Source=20090713-1752\\SQLEXPRESS;Initial Catalog=goods;Integrated Security=True");
......