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¤ÀÃþ: SQL SERVER
§@ªÌ: lutuni (11:38 am)
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¤ÀÃþ: SQL SERVER
§@ªÌ: lutuni (4:35 pm)
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¤ÀÃþ: SQL SERVER
§@ªÌ: lutuni (10:59 am)
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¬d¸ß«È¤á SELECT * FROM [Leader].[dbo].[COPMA] ¬d¸ß¼t°Ó SELECT * FROM [Leader].[dbo].[PURMA] |
¤ÀÃþ: SQL SERVER
§@ªÌ: lutuni (1:46 pm)
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UPDATE table SET field1=value1, field2=value2 WHERE condition_field=condition_value ¨ÑÀ³¼t°Ó¸ê®Æ§ó§ï¸ê®Æ ¥I´Ú±ø¥ó¡GPAY12 ¥[¤u¶O¥Î¬ì¥Ø¡G5522 À³¥I±b´Ú¬ì¥Ø¡G2143 À³¥I²¼¾Ú¬ì¥Ø¡G2121 µ²±b¤é´Á¡GÓ¤ë³{25¤é UPDATE [DEMO].[dbo].[PURMA] SET [MA025]='·í¤ë²¼60¤Ñ',[MA055]='PAY12',[MA042]='5522',[MA041]='2143',[MA043]='2121',[MA035]='25' UPDATE [Leader].[dbo].[PURMA] SET [MA025]='·í¤ë²¼60¤Ñ',[MA055]='PAY12',[MA042]='5522',[MA041]='2143',[MA043]='2121',[MA035]='25' «È¤áÀÉ¸ê®Æ§ó§ï¸ê®Æ ±b´Ú¬ì¥Ø:1143 ²¼¾Ú¬ì¥Ø:1121 UPDATE [DEMO].[dbo].[COPMA] SET [MA047]='1143',[MA074]='1121' UPDATE [Leader].[dbo].[COPMA] SET [MA047]='1143',[MA074]='1121' §ó§ï¹ô§O «È¤á 1. UPDATE [Leader].[dbo].[COPMA] SET [MA014]='NTD' WHERE [MA014]='NT$' 2. UPDATE [Leader].[dbo].[COPMA] SET [MA014]='USD' WHERE [MA014]='US$' ¼t°Ó 1. UPDATE [Leader].[dbo].[PURMA] SET [MA021]='NTD' WHERE [MA021]='NT$' 2. UPDATE [Leader].[dbo].[PURMA] SET [MA021]='USD' WHERE [MA021]='US$' ²£«~ UPDATE [Leader].[dbo].[INVMB] SET [COMPANY]='Leader',[CREATOR]='DS',[USR_GROUP]='0000',[CREATE_DATE]='20120419',[FLAG]=1 |
¤ÀÃþ: SQL SERVER
§@ªÌ: lutuni (1:34 pm)
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SQL»yªk°Ñ¦Ò¤â¥U(SQL) DB2 ´£¨Ñ¤FÃö³s¦¡¸ê®Æ®wªº¬d¸ß»y¨¥ ¢á¢ß¢Ú (Structured Query Language)¡A¬O¤@ºØ«D±`¤f»y¤Æ¡B¬J©ö¾Ç¤S©öÀ´ªº»yªk¡C¦¹¤@»y¨¥´X¥G¬O¨CÓ¸ê®Æ®w¨t²Î³£¥²¶·´£¨Ñªº¡A¥Î¥Hªí¥ÜÃö³s¦¡ªº*§@¡A¥]§t¤F¸ê®Æªº©w¸q¡]¢Ò¢Ò¢Ú¡^¥H¤Î¸ê®Æªº³B²z¡]¢Ò¢Û¢Ú¡^¡CSQLì¨Ó«÷¦¨SEQUEL¡A³o»y¨¥ªºì«¬¥H¡§¨t²Î R¡§ªº¦W¦r¦b IBM ¸t²ü¦è¹êÅç«Ç§¹¦¨¡A¸g¹LIBM¤º³¡¤Î¨ä¥Lªº³\¦h¨Ï¥Î©Ê¤Î®Ä²v´ú¸Õ¡A¨äµ²ªG¬Û·í¥O¤Hº¡·N¡A¨Ã¨M©w¦b¨t²ÎR ªº§Þ³N°ò¦µo®i¥X¨Ó IBM ªº²£«~¡C¦Ó¥B¬ü°ê°ê®a¼Ð·Ç¾Ç·|¡]ANSI¡^¤Î°ê»Ú¼Ð·Ç¤Æ²Õ´¡]ISO¡^¦b1987¿í´`¤@Ó´X¥G¬O¥H IBM SQL ¬°°ò¦ªº¼Ð·ÇÃö³s¦¡¸ê®Æ»y¨¥©w¸q¡C ¤@¡B¸ê®Æ©w¸q ¢Ò¢Ò¢Ú¡]Data Definition Language) ¸ê®Æ©w»y¨¥¬O«ü¹ï¸ê®Æªº®æ¦¡©M§ÎºA¤U©w¸qªº»y¨¥¡A¥L¬O¨CÓ¸ê®Æ®wn«Ø¥ß®ÉԮɺ¥ýn±¹ïªº¡AÁ|¤Z¸ê®Æ¤Àþ¨Çªí®æÃö«Y¡Bªí®æ¤ºªº¦³¤°麽Äæ¦ì¤¸¥DÁä¡Bªí®æ©Mªí®æ¤§¶¡¤¬¬Û°Ñ¦ÒªºÃö«Yµ¥µ¥¡A³£¬O¦b¶}©lªº®ÉÔ©Ò¥²¶·³W¹º¦nªº¡C ¢°¡B«Øªí®æ¡G CREATE TABLE table_name( column1 DATATYPE [NOT NULL] [NOT NULL PRIMARY KEY], column2 DATATYPE [NOT NULL], ...¡^ »¡©ú¡G¡@ DATATYPE --¬O¸ê®Æªº®æ¦¡¡A¸Ô¨£ªí¡C NUT NULL --¥i¤£¥i¥H¤¹³\¸ê®Æ¦³ªÅªº¡]©|¥¼¦³¸ê®Æ¶ñ¤J¡^¡C PRIMARY KEY --¬O¥»ªíªº¥DÁä¡C ¢±¡B§ó§ïªí®æ¡@ ALTER TABLE table_name ADD COLUMN column_name DATATYPE »¡©ú¡G¼W¥[¤@ÓÄæ¦ì¡]¨S¦³§R°£¬YÓÄæ¦ì¤¸ªº»yªk¡C ALTER TABLE table_name ADD PRIMARY KEY (column_name) »¡©ú¡G§ó§ïªí±oªº©w¸q§â¬YÓÄæ¦ì³]¬°¥DÁä¡C ALTER TABLE table_name DROP PRIMARY KEY (column_name) »¡©ú¡G§â¥DÁ䪺©w¸q§R°£¡C ¢²¡B«Ø¥ß¯Á¤Þ¡@ CREATE INDEX index_name ON table_name (column_name) »¡©ú¡G¹ï¬YÓªí®æªºÄæ¦ì¤¸«Ø¥ß¯Á¤Þ¥H¼W¥[¬d¸ß®Éªº³t«×¡C ¢³¡B§R°£¡@ DROP table_name DROP index_name ¤G¡Bªº¸ê®Æ§ÎºA DATATYPEs smallint 16 ¦ì¤¸¤¸ªº¾ã¼Æ¡C interger 32 ¦ì¤¸¤¸ªº¾ã¼Æ¡C decimal(p,s) p ºë½TÈ©M s ¤j¤pªº¤Q¶i¦ì¤¸¾ã¼Æ¡Aºë½TÈp¬O«ü¥þ³¡¦³´XÓ¼Æ(digits)¤j¤pÈ¡As¬O«ü¤p¼Æ ÂI«á¦³´X¦ì¼Æ¡C¦pªG¨S¦³¯S§O«ü©w¡A«h¨t²Î·|³]¬° p=5; s=0 ¡C float 32¦ì¤¸ªº¹ê¼Æ¡C double 64¦ì¤¸ªº¹ê¼Æ¡C char(n) n ªø«×ªº¦r¦ê¡An¤£¯à¶W¹L 254¡C varchar(n) ªø«×¤£©T©w¥B¨ä³Ì¤jªø«×¬° n ªº¦r¦ê¡An¤£¯à¶W¹L 4000¡C graphic(n) ©M char(n) ¤@¼Ë¡A¤£¹L¨ä³æ¦ì¬O¨âÓ¦r¤¸ double-bytes¡A n¤£¯à¶W¹L127¡C³oӧκA¬O¬° ¤F¤ä´©¨âÓ¦r¤¸ªø«×ªº¦rÅé¡A¨Ò¦p¤¤¤å¦r¡C vargraphic(n) ¥iÅܪø«×¥B¨ä³Ì¤jªø«×¬° n ªºÂù¦r¤¸¦r¦ê¡An¤£¯à¶W¹L 2000¡C date ¥]§t¤F ¦~¥÷¡B¤ë¥÷¡B¤é´Á¡C time ¥]§t¤F ¤p®É¡B¤ÀÄÁ¡B¬í¡C timestamp ¥]§t¤F ¦~¡B¤ë¡B¤é¡B®É¡B¤À¡B¬í¡B¤d¤À¤§¤@¬í¡C ¤T¡B¸ê®Æ*§@ ¢Ò¢Û¢Ú ¡]Data Manipulation Language) ¸ê®Æ©w¸q¦n¤§«á±µ¤U¨Óªº´N¬O¸ê®Æªº*§@¡C¸ê®Æªº*§@¤£¥~¥G¼W¥[¸ê®Æ¡]insert)¡B¬d¸ß¸ê®Æ¡]query¡^¡B§ó§ï¸ê®Æ¡]update) ¡B§R°£¸ê®Æ¡]delete¡^¥|ºØ¼Ò¦¡¡A¥H¤U¤À §O¤¶²Ð¥L̪º»yªk¡G ¢°¡B¼W¥[¸ê®Æ¡G INSERT INTO table_name (column1,column2,...) valueS ( value1,value2, ...) »¡©ú¡G 1.Y¨S¦³«ü©wcolumn ¨t²Î«h·|«öªí®æ¤ºªºÄæ¦ì¤¸¶¶§Ç¶ñ¤J¸ê®Æ¡C 2.Äæ¦ì¤¸ªº¸ê®Æ§ÎºA©M©Ò¶ñ¤Jªº¸ê®Æ¥²¶·§k¦X¡C 3.table_name ¤]¥i¥H¬O´ºÆ[ view_name¡C INSERT INTO table_name (column1,column2,...) SELECT columnx,columny,... FROM another_table »¡©ú¡G¤]¥i¥H¸g¹L¤@Ó¤l¬d¸ß¡]subquery¡^§â§Oªºªí®æªº¸ê®Æ¶ñ¤J¡C ¢±¡B¬d¸ß¸ê®Æ¡G °ò¥»¬d¸ß SELECT column1,columns2,... FROM table_name »¡©ú¡G§âtable_name ªº¯S©wÄæ¦ì¤¸¸ê®Æ¥þ³¡¦C¥X¨Ó SELECT * FROM table_name WHERE column1 = xxx [AND column2 > yyy] [OR column3 <> zzz] »¡©ú¡G 1.¡¦*¡¦ªí¥Ü¥þ³¡ªºÄæ¦ì¤¸³£¦C¥X¨Ó¡C 2.WHERE ¤§«á¬O±µ±ø¥ó¦¡¡A§â²Å¦X±ø¥óªº¸ê®Æ¦C¥X¨Ó¡C SELECT column1,column2 FROM table_name ORDER BY column2 [DESC] »¡©ú¡GORDER BY ¬O«ü©w¥H¬YÓÄæ¦ì°µ±Æ§Ç¡A[DESC]¬O«ü±q¤j¨ì¤p±Æ¦C¡AY¨S¦³«ü©ú¡A«h¬O±q¤p¨ì¤j ±Æ¦C ²Õ¦X¬d¸ß ²Õ¦X¬d¸ß¬O«ü©Ò¬d¸ß±o¸ê®Æ¨Ó·½¨Ã¤£¥u¦³³æ¤@ªºªí®æ¡A¦Ó¬OÁp¦X¤@Ó¥H¤Wªº ªí®æ¤~¯à°÷±o¨ìµ²ªGªº¡C SELECT * FROM table1,table2 WHERE table1.colum1=table2.column1 »¡©ú¡G 1.¬d¸ß¨âÓªí®æ¤¤¨ä¤¤ column1 ȬۦPªº¸ê®Æ¡C 2.·íµM¨âÓªí®æ¬Û¤¬¤ñ¸ûªºÄæ¦ì¤¸¡A¨ä¸ê®Æ§ÎºA¥²¶·¬Û¦P¡C 3.¤@Ó½ÆÂøªº¬d¸ß¨ä°Ê¥Î¨ìªºªí®æ¥i¯à·|«Ü¦hÓ¡C ¾ã¦X©Êªº¬d¸ß¡G SELECT COUNT (*) FROM table_name WHERE column_name = xxx »¡©ú¡G ¬d¸ß²Å¦X±ø¥óªº¸ê®Æ¦@¦³´Xµ§¡C SELECT SUM(column1) FROM table_name »¡©ú¡G 1.pºâ¥XÁ`©M¡A©Ò¿ïªºÄæ¦ì¥²¶·¬O¥i¼Æªº¼Æ¦ì§ÎºA¡C 2.°£¦¹¥H¥~ÁÙ¦³ AVG() ¬Opºâ¥§¡¡BMAX()¡BMIN()pºâ³Ì¤j³Ì¤pȪº¾ã¦X©Ê¬d¸ß¡C SELECT column1,AVG(column2) FROM table_name GROUP BY column1 HAVING AVG(column2) > xxx »¡©ú¡G 1.GROUP BY: ¥Hcolumn1 ¬°¤@²Õpºâ column2 ªº¥§¡È¥²¶·©M AVG¡BSUMµ¥¾ã¦X©Ê¬d¸ßªºÃöÁä¦r ¤@°_¨Ï¥Î¡C 2.HAVING : ¥²¶·©M GROUP BY ¤@°_¨Ï¥Î§@¬°¾ã¦X©Êªº¨î¡C ½Æ¦X©Êªº¬d¸ß SELECT * FROM table_name1 WHERE EXISTS ( SELECT * FROM table_name2 WHERE conditions ) »¡©ú¡G 1.WHERE ªº conditions ¥i¥H¬O¥t¥~¤@Óªº query¡C 2.EXISTS ¦b¦¹¬O«ü¦s¦b»P§_¡C SELECT * FROM table_name1 WHERE column1 IN ( SELECT column1 FROM table_name2 WHERE conditions ) »¡©ú¡G¡@ 1. 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SELECT ¥X¨Óªº¸ê®Æ§ÎºA¥²¶·²Å¦X column1¡C ¨ä¥L¬d¸ß SELECT * FROM table_name1 WHERE column1 LIKE ¡¦x%¡¦ »¡©ú¡GLIKE ¥²¶·©M«á±ªº¡¦x%¡¦ ¬Û©IÀ³ªí¥Ü¥H x¬°¶}ÀYªº¦r¦ê¡C SELECT * FROM table_name1 WHERE column1 IN (¡¦xxx¡¦,¡¦yyy¡¦,..) »¡©ú¡GIN «á±±µªº¬O¤@Ó¶°¦X¡Aªí¥Ücolumn1 ¦s¦b¶°¦Xùر¡C SELECT * FROM table_name1 WHERE column1 BETWEEN xx AND yy »¡©ú¡GBETWEEN ªí¥Ü column1 ªºÈ¤¶©ó xx ©M yy ¤§¶¡¡C ¢²¡B§ó§ï¸ê®Æ¡G UPDATE table_name SET column1=¡¦xxx¡¦ WHERE conditoins »¡©ú¡G 1.§ó§ï¬YÓÄæ¦ì³]©w¨äȬ°¡¦xxx¡¦¡C 2.conditions ¬O©Òn²Å¦Xªº±ø¥ó¡BY¨S¦³ WHERE «h¾ãÓ table ªº¨ºÓÄæ¦ì¤¸³£·|¥þ³¡³Q§ó§ï¡C ¢³¡B§R°£¸ê®Æ¡G DELETE FROM table_name WHERE conditions »¡©ú¡G§R°£²Å¦X±ø¥óªº¸ê®Æ¡C »¡©ú¡GÃö©óWHERE±ø¥ó«á±¦pªG¥]§t¦³¤é´Áªº¤ñ¸û¡A¤£¦P¸ê®Æ®w¦³¤£¦Pªº¹Bºâ¦¡¡C¨ãÅé¦p¤U¡G (1)¦pªG¬OACCESS¸ê®Æ®w¡A«h¬°¡GWHERE mydate>#2000-01-01# (2)¦pªG¬OORACLE¸ê®Æ®w¡A«h¬°¡GWHERE mydate>cast(¡¦2000-01-01¡¦ as date) ©Î¡GWHERE mydate>to_date(¡¦2000-01-01¡¦,¡¦yyyy-mm-dd¡¦) ¦bDelphi¤¤¼g¦¨¡G thedate=¡¦2000-01-01¡¦; query1.SQL.add(¡¦select * from abc where mydate>cast(¡¦+¡¦¡¦¡¦¡¦+thedate+¡¦¡¦¡¦¡¦+¡¦ as date)¡¦); ¦pªG¤ñ¸û¤é´Á®É¶¡«¬¡A«h¬°¡G WHERE mydatetime>to_date(¡¦2000-01-01 10:00:01¡¦,¡¦yyyy-mm-dd hh24:mi:ss¡¦) |