ʹÓÃsqlÓï¾ä»ñµÃµ±Ç°ÔÂÌìÊý
ʹÓÃsqlÓï¾ä»ñµÃµ±Ç°ÔÂÌìÊý
--»ñµÃµ±ÔÂÌìÊý
select day(dateadd(mm,1,getdate())-day(getdate())) as ±¾ÔÂÌìÊý ;
select getdate() as µ±Ç°ÈÕÆÚ;
select day(getdate()) as ĿǰµÚ¼¸Ìì;
select getdate()-day(getdate()) as ÉϸöÔÂ×îºóÒ»Ìì; -- ¼õÈ¥Á˵±Ç°µÄÌìÊý
select dateadd(mm,1,getdate())-day(getdate()) as ¼ÓÉÏÒ»¸öÔÂ; -- Ò²¾ÍÊÇÕâ¸öÔµÄ×îºóÒ»Ìì
select day(dateadd(mm,1,getdate())-day(getdate())) as »ñµÃµ±ÔÂÌìÊý;
Ïà¹ØÎĵµ£º
ÔÚ¹¤×÷ÖÐÓöµ½Ò»¸öÎÊÌâ,ÊÇÐèÒªsqlµÝ¹é²éѯµÄ.²»¶®,ÓÚÊǵ½csdnÉÏÈ¥ÎÊ,ÄÇÀïµÄЧÂÊÕæÊǷdz£¸ß,ÎÒÒÔǰҲûÔÚÉÏÃæÎʹýÎÊÌâ.
ÎÊÌâÃèÊö:
ÎÒÓÐÒ»¸ö±í½á¹¹ÈçÏÂ:
id upperid
1 2
3 2
4 1
5 3
¾ßÌå²ã´Î²»ÖªµÀ,ÎÒÏëÓõݹésqlÓ ......
Student(S#,Sname,Sage,Ssex) ѧÉú±í
Course(C#,Cname,T#) ¿Î³Ì±í
SC(S#,C#,score) ³É¼¨±í
Teacher(T#,Tname) ½Ìʦ±í
ÎÊÌ⣺
1¡¢²éѯ“001”¿Î³Ì±È“002”¿Î³Ì³É¼¨¸ßµÄËùÓÐѧÉúµÄѧºÅ£»
select a.S# from (select s#,score from SC where C#='001') a,(select s#,score
& ......
½ñÌìºÜ×ÔÈ»µÄÔÚдSqlÓï¾äµÄʱºòÓÃÁËTop£¬Ò»¿ªÊ¼Ã»·¢ÏÖÎÊÌ⣬ÒòΪÎÒ´ÓÊý¾Ý¿â¶Á³öµÄÖµÕýºÃÊÇ0£¬¶øÎÒϰ¹ß±äÁ¿¶¨ÒåµÄʱºòÒ²¶¼¸³Öµ0£¬¿ÉÊǵ½ÎÒ²»Òª0µÄʱºòÎҾͷ¢ÏÖÎÊÌâÁË¡£ºóÀ´²ÅÖªµÀ£¬¿É°®µÄСsqlite¾¹È»Óв»Ö§³ÖµÄsqlÓï·¨¡£
¡¡¡¡¿´µ½Ä³¸öÂÛ̳ÓиöÐÂÊÖÒ²·¢ÏÖÁËÕâ¸öÎÊÌâ²¢·¢ÌûÁË£¬ÏÂÃæÒ»Å£È˵Ļظ´ÊÇ“topÊÇÄļҵĹؼü´Ê?s ......
Oracle·¢²¼Ãâ·ÑÊý¾Ý¿â¿ª·¢¹¤¾ßSQL Developer 1.2
2007.09.25 À´×Ô£ºCSDN¡¡ ÄŲ»º° ¹²ÓÐÆÀÂÛ()Ìõ ·¢±íÆÀÂÛ ÊÕ²Ø
Oracle SQL DeveloperÊǼ׹ÇÎĹ«Ë¾Ãâ·ÑÌṩµÄÊý¾Ý¿â¿ª·¢¹¤¾ß£¬¿É°ïÖúÓû§¼ò»¯¿ª·¢¹¤×÷£¬Ìá¸ß±àÖÆºÍµ÷ÊÔSQLºÍPL/SQL´úÂëµÄЧÂÊ¡£ÏÖÔÚ£¬Õâ¸öÃâ·Ñ¹¤ ......
ÊÓͼ
SET¡¡NOCOUNT ON;
SET Northwind;
GO
IF OBJECT_ID('dbo.ViewName') IS NOT NULL
DROP VIEW dbo.ViewName;
GO
CREATE VIEW dbo.Viewname
AS
SELECT * from customer AS C
WHERE EXISTS
(SELECT * from dbo.Orders AS O
WHERE O.CustomerI ......