(ÍøÕª)SQL·ÖÒ³Óï¾ä
֮ǰżȻ¹äÍøÒ³µÄʱºò¿´µ½µÄ,ÏêϸµÄÍøÖ·Íü¼Çcopy¹ýÀ´ÁË£¬ÕæÊDZ§Ç¸¡£¾õµÃ¼òµ¥Ò×¶®,ËùÒÔתÁË,ÎûÎû
ÓйطÖÒ³ SQL µÄ×ÊÁϺܶ࣬ÓеÄʹÓô洢¹ý³Ì£¬ÓеÄʹÓÃÓαꡣ±¾È˲»Ï²»¶Ê¹ÓÃÓα꣬ÎÒ¾õµÃËüºÄ×Ê¡¢Ð§Âʵͣ»Ê¹Óô洢¹ý³ÌÊǸö²»´íµÄÑ¡Ôñ£¬ÒòΪ´æ´¢¹ý³ÌÊǾ¹ýÔ¤±àÒëµÄ£¬Ö´ÐÐЧÂʸߣ¬Ò²¸üÁé»î¡£ÏÈ¿´¿´µ¥Ìõ SQL Óï¾äµÄ·ÖÒ³ SQL °É¡£
·½·¨1£º
ÊÊÓÃÓÚ SQL Server 2000/2005
SELECT TOP Ò³´óС *
from table1
WHERE id NOT IN
(
SELECT TOP Ò³´óС*(Ò³Êý-1) id from table1 ORDER BY id
)
ORDER BY id
·½·¨2£º
ÊÊÓÃÓÚ SQL Server 2000/2005
SELECT TOP Ò³´óС *
from table1
WHERE id >
(
SELECT ISNULL(MAX(id),0)
from
(
SELECT TOP Ò³´óС*(Ò³Êý-1) id from table1 ORDER BY id
) A
)
ORDER BY id
·½·¨3£º
ÊÊÓÃÓÚ SQL Server 2005
SELECT TOP Ò³´óС *
from
(
SELECT ROW_NUMBER() OVER (ORDER BY id) AS RowNumber,* from table1
) A
WHERE RowNumber > Ò³´óС*(Ò³Êý-1)
˵Ã÷£¬Ò³´óС£ºÃ¿Ò³µÄÐÐÊý£»Ò³Êý£ºµÚ¼¸Ò³¡£Ê¹ÓÃʱ£¬Çë°Ñ&ldq
Ïà¹ØÎĵµ£º
SQL :Structured Query Language½á¹¹»¯²éѯÓïÑÔ
1.Select [Predicate] *(filed) from table/view Where ... Group by ... Having... Order by ... With ...
Predicate£º°üÀ¨all/Distinct/Distinctrow/Top£¬ÏÞÖÆ²éѯ½á¹û£»
As¿ÉÒÔÃüÃû±ðÃû£»
Where ... Ö¸¶¨Ä³Ð©Ìõ¼þ£¬½«ËùÓ ......
SQL SERVERµÇ¼Óû§ÔÚ·þÎñÆ÷ÉϵÄȨÏÞ
Ò»¸öµÇ¼Óû§µ½µ×ÔÚSQL SERVERʵÀýÉÏÓÐʲôÑùµÄȨÏÞ£¬ÏÂÃæÒÔSQL SERVER2005ΪÀýÀ´Ï¸Êýһϡ£
Ò»£®
Ê×ÏȲ鿴¸ÃµÇ¼Óû§ÊôÓÚÄĸö¹Ì¶¨·þÎñÆ÷½ÇÉ«¡£ËùÓÐSQL SERVERµÄµÇ¼Óû§ºÍ½ÇÉ«¶¼»áÔÚmaster.sys.server_principalÊÓͼÉÏÓÐÒ»Ìõ¼Ç¼¡£¶ø¼Ç¼µÇ¼Óû§ÊôÓÚʲô·þÎñÆ÷½ÇÉ«µÄÊÓͼÊÇmaster. ......
ºÜ¶à¼¼Êõ°®ºÃÕߵĵçÄÔÉÏ×ÜÊǰ²×°Á˺ܶàÈí¼þ£¬°üÀ¨Ó¦ÓÃÈí¼þ¡¢¿ª·¢¹¤¾ßÈí¼þ¼°Êý¾Ý¿âÈí¼þ£¬µ«ÊÇËæ×Åʱ¼äµÄÁ÷ÊÅ£¬ÂýÂýµØµçÄÔÉÏ×°µÄÈí¼þÒѾ³¬³öÁ˵çÄÔ±¾ÉíËùÄÜ
³ÐÔØµÄÁ¿ÁË£¬Òò¶ø³öÏÖÁ˵çÄÔÔËÐÐËÙ¶ÈÂýµÈÎÊÌ⡣ͬʱ£¬Ò²ÓÐһЩµ¥Î»»ò¸öÈ˵ĵçÄÔÓÉÓÚ³ö³§Äê´úÓÐЩ¾ÃÔ¶£¬¼´Ê¹Ö»°²×°Ò»ÖÖ»ò¼«ÉÙÊýÈí¼þʱҲ»áÏÔʾ³öÔËÐÐËÙ¶ÈÂý
µÄÏÖÏó¡£ ......
ÔÚsqlÖд´½¨Óû§×Ô¶¨Ò寴Òôº¯Êý£º
create function f_GetPy(@Str nvarchar(400))
returns nvarchar(4000)
as
begin
declare @strlen int,@re nvarchar(4000)
declare @t table(chr nchar(1) collate Chinese_PRC_CI_AS,letter nchar(1))
insert @t select 'ß¹','A' union all select '°Ë','B'
union all select 'àê ......
ÏÂÁÐÓï¾ä²¿·ÖÊÇMssqlÓï¾ä£¬²»¿ÉÒÔÔÚaccessÖÐʹÓá£
SQL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(CREATE£¬ALTER£¬DROP£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(SELECT£¬DELETE£¬UPDATE£¬INSERT)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)
Ê×ÏÈ,¼òÒª½éÉÜ»ù´¡Óï¾ä£º
1¡¢ËµÃ÷£º´´½¨Êý¾Ý¿â
CREATE DATABASE data ......