SQL Server²éѯһÖÜÄڵļǼ
select * from tableName where datediff(week,dateField,getdate())=0
ÕâÑù²é³öÀ´µÄ½á¹ûÊÇ´ÓÐÇÆÚÌìµ½ÐÇÆÚÁù(ÀÏÍâĬÈÏÐÇÆÚÌìÊÇÒ»ÖܵĵÚÒ»Ìì).
Èç¹ûÏëÒÔÐÇÆÚÒ»×÷ΪµÚÒ»ÌìµÄ»°,Á½¸öʱ¼ä¶¼ÐèÒª¼õÒ»,ÈçÏÂ:
select * from tableName where datediff(week,dateField-1,getdate()-1)=0
Ïà¹ØÎĵµ£º
SQL Server 2000 ¸÷ÖÖ¶ÔÏóµÄ×î´óÖµ(ÊýÁ¿»ò´óС)
¹ÜÀíµÄÒ»¸öÊý¾Ý¿â´óС½«½ü10G£¬¿ªÊ¼µ£ÐÄÊý¾Ý¿â»á²»»á¹ý´ó£¬²éѯSQL ServerµÄÁª»ú´ÔÊéºó·¢ÏÖ×Ô¼ºµÄµ£ÐÄÕæµÄÊǶàÓàµÄ¡£
SQL Server 2000Êý¾Ý¿âÎļþ´óС£¨Êý¾Ý¡¢ÈÕÖ¾£©×î´ó¿ÉÒÔÖ§³Ö 32 TB µÄÎļþ
½ØÈ¡SQL Server 2000Áª»ú´ÔÊéÖеÄ×î´óÈÝÁ¿ËµÃ÷·½±ã´ó¼Ò²éÔÄ¡£
SQL ServerÊý¾Ý ......
1¡¢ËµÃ÷£º¸´ÖƱí(Ö»¸´Öƽṹ,Ô´±íÃû£ºa бíÃû£ºb) (Access¿ÉÓÃ)
·¨Ò»£ºselect * into b from a where 1<>1
·¨¶þ£ºselect top 0 * into b from a
2¡¢ËµÃ÷£º¿½±´±í(¿½±´Êý¾Ý,Ô´±íÃû£ºa Ä¿±ê±íÃû£ºb) (Access¿ÉÓÃ)
insert into b(a, b, c) select d,e,f from b;
3¡¢ËµÃ÷£º¿çÊý¾Ý¿âÖ®¼ä±íµÄ¿½±´(¾ßÌåÊý¾ÝʹÓþø¶Ô· ......
×Ö·ûÀàÐÍ
Char: ¶¨³¤·ÇUnicodeµÄ×Ö·ûÐÍÊý¾Ý£¬×î´ó³¤¶ÈΪ8000
Varchar:±ä³¤·ÇUnicodeµÄ×Ö·ûÐÍÊý¾Ý£¬×î´ó³¤¶ÈΪ8000
Text(varchar(max)):±ä³¤·ÇUnicodeµÄ×Ö·ûÐÍÊý¾Ý£¬×î´ó³¤¶ÈΪ2G
Nchar:¶¨³¤UnicodeµÄ×Ö·ûÐÍÊý¾Ý£¬×î´ó³¤¶ÈΪ8000
Nvarchar:±ä³¤UnicodeµÄ×Ö·ûÐÍÊý¾Ý£¬×î´ó³¤¶ÈΪ8000
Ntext(nvarchar(max)):± ......
ͨ³££¬ÄãÐèÒª»ñµÃµ±Ç°ÈÕÆںͼÆËãһЩÆäËûµÄÈÕÆÚ£¬ÀýÈ磬ÄãµÄ³ÌÐò¿ÉÄÜÐèÒªÅжÏÒ»¸öÔµĵÚÒ»Ìì»òÕß×îºóÒ»Ìì¡£ÄãÃǴ󲿷ÖÈË´ó¸Å¶¼ÖªµÀÔõÑù°ÑÈÕÆÚ½øÐзָÄê¡¢Ô¡¢Èյȣ©£¬È»ºó½ö½öÓ÷ָî³öÀ´µÄÄê¡¢Ô¡¢ÈյȷÅÔÚ¼¸¸öº¯ÊýÖмÆËã³ö×Ô¼ºËùÐèÒªµÄÈÕÆÚ£¡ÔÚÕâƪÎÄÕÂÀÎÒ½«¸æËßÄãÈçºÎʹÓÃDATEADDºÍ DATEDIFFº¯ÊýÀ´¼ÆËã³öÔÚÄãµÄ³ÌÐò ......
Using Oracle Trace Analyzer (trcanlzr.sql)
Dave Moore: Author of Oracle Utilities
Oracle has provided another utility initially designed for performance tuning Oracle Applications. Trace Analyzer is provided in the form of a PL/SQL package (TRCA$ ). The Trace Analyzer utility i ......