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銆銆SQL鍒嗙被錛? 銆銆DDL鈥旀暟鎹畾涔夎璦(CREATE錛孉LTER錛孌ROP錛孌ECLARE) 銆銆棣栧厛,綆瑕佷粙緇嶅熀紜璇彞錛?/p> 銆銆1銆佽鏄庯細(xì)鍒涘緩鏁版嵁搴?/p> CREATE DATABASE database-name 銆銆2銆佽鏄庯細(xì)鍒犻櫎鏁版嵁搴?/p> drop database dbname 銆銆3銆佽鏄庯細(xì)澶囦喚sql server 銆銆--- 鍒涘緩 澶囦喚鏁版嵁鐨?device USE master 銆銆--- 寮濮?澶囦喚 BACKUP DATABASE pubs TO testBack 銆銆4銆佽鏄庯細(xì)鍒涘緩鏂拌〃 create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..) 銆銆鏍規(guī)嵁宸叉湁鐨勮〃鍒涘緩鏂拌〃錛? A錛歝reate table tab_new like tab_old (浣跨敤鏃ц〃鍒涘緩鏂拌〃) 銆銆5銆佽鏄庯細(xì) 銆銆鍒犻櫎鏂拌〃錛歞rop table tabname 銆銆6銆佽鏄庯細(xì) 銆銆澧炲姞涓涓垪錛欰lter table tabname add column col type 銆銆娉細(xì)鍒楀鍔犲悗灝嗕笉鑳藉垹闄ゃ侱B2涓垪鍔犱笂鍚庢暟鎹被鍨嬩篃涓嶈兘鏀瑰彉錛屽敮涓鑳芥敼鍙樼殑鏄鍔爒archar綾誨瀷鐨勯暱搴︺?/p> 銆銆7銆佽鏄庯細(xì) 銆銆娣誨姞涓婚敭錛欰lter table tabname add primary key(col) 銆銆璇存槑錛?/p> 銆銆鍒犻櫎涓婚敭錛欰lter table tabname drop primary key(col) 銆銆8銆佽鏄庯細(xì) 銆銆鍒涘緩绱㈠紩錛歝reate [unique] index idxname on tabname(col鈥?) 銆銆鍒犻櫎绱㈠紩錛歞rop index idxname 銆銆娉細(xì)绱㈠紩鏄笉鍙洿鏀圭殑錛屾兂鏇存敼蹇呴』鍒犻櫎閲嶆柊寤恒?/p> 銆銆9銆佽鏄庯細(xì) 銆銆鍒涘緩瑙嗗浘錛歝reate view viewname as select statement 銆銆鍒犻櫎瑙嗗浘錛歞rop view viewname 銆銆10銆佽鏄庯細(xì)鍑犱釜綆鍗曠殑鍩烘湰鐨剆ql璇彞 銆銆閫夋嫨錛歴elect * from table1 where 鑼冨洿 銆銆鎻掑叆錛歩nsert into table1(field1,field2) values(value1,value2) 銆銆鍒犻櫎錛歞elete from table1 where 鑼冨洿 銆銆鏇存柊錛歶pdate table1 set field1=value1 where 鑼冨洿 銆銆鏌ユ壘錛歴elect * from table1 where field1 like 鈥?value1%鈥?---like鐨勮娉曞緢綺懼錛屾煡璧勬枡! 銆銆鎺掑簭錛歴elect * from table1 order by field1,field2 [desc] 銆銆鎬繪暟錛歴elect count * as totalcount from table1 銆銆姹傚拰錛歴elect sum(field1) as sumvalue from table1 銆銆騫沖潎錛歴elect avg(field1) as avgvalue from table1 銆銆鏈澶э細(xì)select max(field1) as maxvalue from table1 銆銆鏈灝忥細(xì)select min(field1) as minvalue from table1 銆銆11銆佽鏄庯細(xì)鍑犱釜楂樼駭鏌ヨ榪愮畻璇?/p> 銆銆A錛?UNION 榪愮畻絎? 銆銆UNION 榪愮畻絎﹂氳繃緇勫悎鍏朵粬涓や釜緇撴灉琛紙渚嬪 TABLE1 鍜?TABLE2錛夊茍娑堝幓琛ㄤ腑浠諱綍閲嶅琛岃屾淳鐢熷嚭涓涓粨鏋滆〃銆傚綋 ALL 闅?UNION 涓璧蜂嬌鐢ㄦ椂錛堝嵆 UNION ALL錛夛紝涓嶆秷闄ら噸澶嶈銆備袱縐嶆儏鍐典笅錛屾淳鐢熻〃鐨勬瘡涓琛屼笉鏄潵鑷?TABLE1 灝辨槸鏉ヨ嚜 TABLE2銆?/p> 銆銆B錛?EXCEPT 榪愮畻絎? 銆銆EXCEPT 榪愮畻絎﹂氳繃鍖呮嫭鎵鏈夊湪 TABLE1 涓絾涓嶅湪 TABLE2 涓殑琛屽茍娑堥櫎鎵鏈夐噸澶嶈鑰屾淳鐢熷嚭涓涓粨鏋滆〃銆傚綋 ALL 闅?EXCEPT 涓璧蜂嬌鐢ㄦ椂 (EXCEPT ALL)錛屼笉娑堥櫎閲嶅琛屻? 銆銆C錛?INTERSECT 榪愮畻絎?/p> 銆銆INTERSECT 榪愮畻絎﹂氳繃鍙寘鎷?TABLE1 鍜?TABLE2 涓兘鏈夌殑琛屽茍娑堥櫎鎵鏈夐噸澶嶈鑰屾淳鐢熷嚭涓涓粨鏋滆〃銆傚綋 ALL 闅?INTERSECT 涓璧蜂嬌鐢ㄦ椂 (INTERSECT ALL)錛屼笉娑堥櫎閲嶅琛屻?/p> 銆銆娉細(xì)浣跨敤榪愮畻璇嶇殑鍑犱釜鏌ヨ緇撴灉琛屽繀欏繪槸涓鑷寸殑銆?/p> 銆銆12銆佽鏄庯細(xì)浣跨敤澶栬繛鎺? 銆銆A銆乴eft outer join錛? 銆銆宸﹀榪炴帴錛堝乏榪炴帴錛夛細(xì)緇撴灉闆嗗嚑鍖呮嫭榪炴帴琛ㄧ殑鍖歸厤琛岋紝涔熷寘鎷乏榪炴帴琛ㄧ殑鎵鏈夎銆? SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c 銆銆B錛歳ight outer join: 銆銆鍙沖榪炴帴(鍙寵繛鎺?錛氱粨鏋滈泦鏃㈠寘鎷繛鎺ヨ〃鐨勫尮閰嶈繛鎺ヨ錛屼篃鍖呮嫭鍙寵繛鎺ヨ〃鐨勬墍鏈夎銆?/p> 銆銆C錛歠ull outer join錛? 銆銆鍏ㄥ榪炴帴錛氫笉浠呭寘鎷鍙瘋繛鎺ヨ〃鐨勫尮閰嶈錛岃繕鍖呮嫭涓や釜榪炴帴琛ㄤ腑鐨勬墍鏈夎褰曘?/p> 銆銆鍏舵錛屽ぇ瀹舵潵鐪嬩竴浜涗笉閿欑殑sql璇彞 銆銆1銆佽鏄庯細(xì)澶嶅埗琛?鍙鍒剁粨鏋?婧愯〃鍚嶏細(xì)a 鏂拌〃鍚嶏細(xì)b) (Access鍙敤) 銆銆娉曚竴錛歴elect * into b from a where 1<>1 銆銆娉曚簩錛歴elect top 0 * into b from a 銆銆2銆佽鏄庯細(xì)鎷瘋礉琛?鎷瘋礉鏁版嵁,婧愯〃鍚嶏細(xì)a 鐩爣琛ㄥ悕錛歜) (Access鍙敤) insert into b(a, b, c) select d,e,f from b; 銆銆3銆佽鏄庯細(xì)璺ㄦ暟鎹簱涔嬮棿琛ㄧ殑鎷瘋礉(鍏蜂綋鏁版嵁浣跨敤緇濆璺緞) (Access鍙敤) insert into b(a, b, c) select d,e,f from b in 鈥樺叿浣撴暟鎹簱鈥?where 鏉′歡 銆銆渚嬪瓙錛?.from b in '"&Server.MapPath(".")&"\data.mdb" &"' where.. 銆銆4銆佽鏄庯細(xì)瀛愭煡璇?琛ㄥ悕1錛歛 琛ㄥ悕2錛歜) select a,b,c from a where a IN (select d from b ) 鎴栬? select a,b,c from a where a IN (1,2,3) 銆銆5銆佽鏄庯細(xì)鏄劇ず鏂囩珷銆佹彁浜や漢鍜屾渶鍚庡洖澶嶆椂闂?/p> select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b 銆銆6銆佽鏄庯細(xì)澶栬繛鎺ユ煡璇?琛ㄥ悕1錛歛 琛ㄥ悕2錛歜) select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c 銆銆7銆佽鏄庯細(xì)鍦ㄧ嚎瑙嗗浘鏌ヨ(琛ㄥ悕1錛歛 ) select * from (SELECT a,b,c FROM a) T where t.a > 1; 銆銆8銆佽鏄庯細(xì)between鐨勭敤娉?between闄愬埗鏌ヨ鏁版嵁鑼冨洿鏃跺寘鎷簡(jiǎn)杈圭晫鍊?not between涓嶅寘鎷?/p> select * from table1 where time between time1 and time2 select a,b,c, from table1 where a not between 鏁板? and 鏁板? 銆銆9銆佽鏄庯細(xì)in 鐨勪嬌鐢ㄦ柟娉?/p> select * from table1 where a [not] in (鈥樺?鈥?鈥欏?鈥?鈥欏?鈥?鈥欏?鈥? 銆銆10銆佽鏄庯細(xì)涓ゅ紶鍏寵仈琛紝鍒犻櫎涓昏〃涓凡緇忓湪鍓〃涓病鏈夌殑淇℃伅 delete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 ) 銆銆11銆佽鏄庯細(xì)鍥涜〃鑱旀煡闂錛?/p> select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where ..... 銆銆12銆佽鏄庯細(xì)鏃ョ▼瀹夋帓鎻愬墠浜斿垎閽熸彁閱?/p> SQL: select * from 鏃ョ▼瀹夋帓 where datediff('minute',f寮濮嬫椂闂?getdate())>5 銆銆13銆佽鏄庯細(xì)涓鏉ql 璇彞鎼炲畾鏁版嵁搴撳垎欏?/p> select top 10 b.* from (select top 20 涓婚敭瀛楁,鎺掑簭瀛楁 from 琛ㄥ悕 order by 鎺掑簭瀛楁 desc) a,琛ㄥ悕 b where b.涓婚敭瀛楁 = a.涓婚敭瀛楁 order by a.鎺掑簭瀛楁 銆銆14銆佽鏄庯細(xì)鍓?0鏉¤褰?/p> select top 10 * form table1 where 鑼冨洿 銆銆15銆佽鏄庯細(xì)閫夋嫨鍦ㄦ瘡涓緇刡鍊肩浉鍚岀殑鏁版嵁涓搴旂殑a鏈澶х殑璁板綍鐨勬墍鏈変俊鎭?綾諱技榪欐牱鐨勭敤娉曞彲浠ョ敤浜庤鍧涙瘡鏈堟帓琛屾,姣忔湀鐑攢浜у搧鍒嗘瀽,鎸夌鐩垚緇╂帓鍚?絳夌瓑.) select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b) 銆銆16銆佽鏄庯細(xì)鍖呮嫭鎵鏈夊湪 TableA 涓絾涓嶅湪 TableB鍜孴ableC 涓殑琛屽茍娑堥櫎鎵鏈夐噸澶嶈鑰屾淳鐢熷嚭涓涓粨鏋滆〃 (select a from tableA ) except (select a from tableB) except (select a from tableC) 銆銆17銆佽鏄庯細(xì)闅忔満鍙栧嚭10鏉℃暟鎹?/p> select top 10 * from tablename order by newid() 銆銆18銆佽鏄庯細(xì)闅忔満閫夋嫨璁板綍 select newid() 銆銆19銆佽鏄庯細(xì)鍒犻櫎閲嶅璁板綍 Delete from tablename where id not in (select max(id) from tablename group by col1,col2,...) 銆銆20銆佽鏄庯細(xì)鍒楀嚭鏁版嵁搴撻噷鎵鏈夌殑琛ㄥ悕 select name from sysobjects where type='U' 銆銆21銆佽鏄庯細(xì)鍒楀嚭琛ㄩ噷鐨勬墍鏈夌殑 select name from syscolumns where id=object_id('TableName') 銆銆22銆佽鏄庯細(xì)鍒楃ずtype銆乿ender銆乸cs瀛楁錛屼互type瀛楁鎺掑垪錛宑ase鍙互鏂逛究鍦板疄鐜板閲嶉夋嫨錛岀被浼約elect 涓殑case銆?/p> select type,sum(case vender when 'A' then pcs else 0 end),sum(case vender when 'C' then pcs else 0 end),sum(case vender when 'B' then pcs else 0 end) FROM tablename group by type 銆銆鏄劇ず緇撴灉錛?/p> type聽(tīng)聽(tīng)聽(tīng) vender pcs 銆銆23銆佽鏄庯細(xì)鍒濆鍖栬〃table1 TRUNCATE TABLE table1 銆銆24銆佽鏄庯細(xì)閫夋嫨浠?0鍒?5鐨勮褰?/p> select top 5 * from (select top 15 * from table order by id asc) table_鍒悕 order by id desc 銆銆闅忔満閫夋嫨鏁版嵁搴撹褰曠殑鏂規(guī)硶錛堜嬌鐢≧andomize鍑芥暟錛岄氳繃SQL璇彞瀹炵幇錛?/p> 銆銆瀵瑰瓨鍌ㄥ湪鏁版嵁搴撲腑鐨勬暟鎹潵璇達(dá)紝闅忔満鏁扮壒鎬ц兘緇欏嚭涓婇潰鐨勬晥鏋滐紝浣嗗畠浠彲鑳藉お鎱簡(jiǎn)浜涖備綘涓嶈兘瑕佹眰ASP鈥滄壘涓殢鏈烘暟鈥濈劧鍚庢墦鍗板嚭鏉ャ傚疄闄呬笂甯歌鐨勮В鍐蟲(chóng)柟妗堟槸寤虹珛濡備笅鎵紺虹殑寰幆錛?/p> Randomize 銆銆榪欏緢瀹規(guī)槗鐞嗚В銆傞鍏堬紝浣犲彇鍑?鍒?00鑼冨洿涔嬪唴鐨勪竴涓殢鏈烘暟錛堝亣璁?00灝辨槸鏁版嵁搴撳唴璁板綍鐨勬繪暟錛夈傜劧鍚庯紝浣犻亶鍘嗘瘡涓璁板綍鏉ユ祴璇旾D 鐨勫箋佹鏌ュ叾鏄惁鍖歸厤RNumber銆傛弧瓚蟲(chóng)潯浠剁殑璇濆氨鎵ц鐢盩HEN 鍏抽敭瀛楀紑濮嬬殑閭d竴鍧椾唬鐮併傚亣濡備綘鐨凴Number 絳変簬495錛岄偅涔堣寰幆涓閬嶆暟鎹簱鑺辯殑鏃墮棿鍙氨闀夸簡(jiǎn)銆傝櫧鐒?00榪欎釜鏁板瓧鐪嬭搗鏉ュぇ浜?jiǎn)浜涘Q屼絾鐩告瘮鏇翠負(fù)紼沖浐鐨勪紒涓氳В鍐蟲(chóng)柟妗堣繖榪樻槸涓皬鍨嬫暟鎹簱浜?jiǎn)锛屽悗鑰呴氬父鍦ㄤ竴涓暟鎹簱鍐呭氨鍖呭惈浜?jiǎn)鎴愬崈涓婁竾鏉¤褰曘傝繖鏃跺欎笉灝辨瀹氫簡(jiǎn)錛? 銆銆閲囩敤SQL錛屼綘灝卞彲浠ュ緢蹇湴鎵懼嚭鍑嗙‘鐨勮褰曞茍涓旀墦寮涓涓彧鍖呭惈璇ヨ褰曠殑recordset錛屽涓嬫墍紺猴細(xì) Randomize 銆銆涓嶅繀鍐欏嚭RNumber 鍜孖D錛屼綘鍙渶瑕佹鏌ュ尮閰嶆儏鍐靛嵆鍙傚彧瑕佷綘瀵逛互涓婁唬鐮佺殑宸ヤ綔婊℃剰錛屼綘鑷彲鎸夐渶鎿嶄綔鈥滈殢鏈衡濊褰曘俁ecordset娌℃湁鍖呭惈鍏朵粬鍐呭錛屽洜姝や綘寰堝揩灝辮兘鎵懼埌浣犻渶瑕佺殑璁板綍榪欐牱灝卞ぇ澶ч檷浣庝簡(jiǎn)澶勭悊鏃墮棿銆?br /> 銆銆鍐嶈皥闅忔満鏁?/p> 銆銆鐜板湪浣犱笅瀹氬喅蹇?jī)瑕佹Θ骞睷andom 鍑芥暟鐨勬渶鍚庝竴婊存補(bǔ)錛岄偅涔堜綘鍙兘浼?xì)涓嬈″彇鍑哄鏉¢殢鏈鴻褰曟垨鑰呮兂閲囩敤涓瀹氶殢鏈鴻寖鍥村唴鐨勮褰曘傛妸涓婇潰鐨勬爣鍑哛andom 紺轟緥鎵╁睍涓涓嬪氨鍙互鐢⊿QL搴斿涓婇潰涓ょ鎯呭喌浜?jiǎn)銆?/p> 銆銆涓轟簡(jiǎn)鍙栧嚭鍑犳潯闅忔満閫夋嫨鐨勮褰曞茍瀛樻斁鍦ㄥ悓涓recordset鍐咃紝浣犲彲浠ュ瓨鍌ㄤ笁涓殢鏈烘暟錛岀劧鍚庢煡璇㈡暟鎹簱鑾峰緱鍖歸厤榪欎簺鏁板瓧鐨勮褰曪細(xì) 銆銆SQL = "SELECT * FROM Customers WHERE ID = " & RNumber & " OR ID = " & RNumber2 & " OR ID = " & RNumber3 銆銆鍋囧浣犳兂閫夊嚭10鏉¤褰曪紙涔熻鏄瘡嬈¢〉闈㈣杞芥椂鐨?0鏉¢摼鎺ョ殑鍒楄〃錛夛紝浣犲彲浠ョ敤BETWEEN 鎴栬呮暟瀛︾瓑寮忛夊嚭絎竴鏉¤褰曞拰閫傚綋鏁伴噺鐨勯掑璁板綍銆傝繖涓鎿嶄綔鍙互閫氳繃濂藉嚑縐嶆柟寮忔潵瀹屾垚錛屼絾鏄?SELECT 璇彞鍙樉紺轟竴縐嶅彲鑳斤紙榪欓噷鐨処D 鏄嚜鍔ㄧ敓鎴愮殑鍙風(fēng)爜錛夛細(xì) 銆銆娉ㄦ剰錛氫互涓婁唬鐮佺殑鎵ц鐩殑涓嶆槸媯(gè)鏌ユ暟鎹簱鍐呮槸鍚︽湁9鏉″茍鍙戣褰曘?/p> 銆銆闅忔満璇誨彇鑻ュ共鏉¤褰曪紝嫻嬭瘯榪?/p> Access璇硶錛歋ELECT top 10 * From 琛ㄥ悕 ORDER BY Rnd(id) 銆銆Access宸﹁繛鎺ヨ娉?鏈榪戝紑鍙戣鐢ㄥ乏榪炴帴,Access甯姪浠涔堥兘娌℃湁,緗戜笂娌℃湁Access鐨凷QL璇存槑,鍙湁鑷繁嫻嬭瘯, 鐜板湪璁頒笅浠ュ鍚庢煡) 銆銆璇硶 select table1.fd1,table1,fd2,table2.fd2 From table1 left join table2 on table1.fd1,table2.fd1 where ... 銆銆浣跨敤SQL璇彞 鐢?..浠f浛榪囬暱鐨勫瓧絎︿覆鏄劇ず 銆銆璇硶錛?/p> 銆銆SQL鏁版嵁搴擄細(xì)select case when len(field)>10 then left(field,10)+'...' else field end as news_name,news_id from tablename 銆銆Conn.Execute璇存槑 銆銆Execute鏂規(guī)硶 銆銆璇ユ柟娉曠敤浜庢墽琛孲QL璇彞銆傛牴鎹甋QL璇彞鎵ц鍚庢槸鍚﹁繑鍥炶褰曢泦錛岃鏂規(guī)硶鐨勪嬌鐢ㄦ牸寮忓垎涓轟互涓嬩袱縐嶏細(xì) 銆銆1錛庢墽琛孲QL鏌ヨ璇彞鏃訛紝灝嗚繑鍥炴煡璇㈠緱鍒扮殑璁板綍闆嗐傜敤娉曚負(fù)錛?/p> 銆銆Set 瀵硅薄鍙橀噺鍚?榪炴帴瀵硅薄.Execute("SQL 鏌ヨ璇█") 銆銆Execute鏂規(guī)硶璋冪敤鍚庯紝浼?xì)鑷姩鍒涘圾櫘板綍闆嗗璞″Q屽茍灝嗘煡璇㈢粨鏋滃瓨鍌ㄥ湪璇ヨ褰曞璞′腑錛岄氳繃Set鏂規(guī)硶錛屽皢璁板綍闆嗚祴緇欐寚瀹氱殑瀵硅薄淇濆瓨錛屼互鍚庡璞″彉閲忓氨浠h〃浜?jiǎn)璇ヨ褰曢泦瀵硅薄銆?/p> 銆銆2錛庢墽琛孲QL鐨勬搷浣滄ц璦鏃訛紝娌℃湁璁板綍闆嗙殑榪斿洖銆傛鏃剁敤娉曚負(fù)錛?/p> 銆銆榪炴帴瀵硅薄.Execute "SQL 鎿嶄綔鎬ц鍙? 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鏂扮敤鎴?#8220;testcamds”鎴愬姛鐧婚檰錛?/p>
6銆佸鍏ュ鍑烘暟鎹簱
鍏堣繍琛宑md鍛戒護(hù)錛岃繘鍏ュ懡浠よ妯″紡錛岃漿鍒頒笅闈㈢殑鐩綍錛欴:"oracle"product"10.2.0"db_1"BIN銆愯鐩綍涓嬫湁exp.exe鏂囦歡銆?br />
1錛夊鍏?/h3>
2錛夊鍑猴細(xì)
id int not null,
name char(20)
);
2銆佸甫涓婚敭鐨勶細(xì)
a錛?br>
id int not null primary key,
name char(20)
);
b錛氬鍚堜富閿?br>
id int not null,
name char(20),
primary key (id,name)
);
3銆佸甫榛樿鍊肩殑錛?br>
id int not null default 0 primary key,
name char(20) default '1'
);
杞創(chuàng)鐨勶細(xì)
(PLAYERNO INTEGER NOT NULL PRIMARY KEY,
NAME CHAR(15) NOT NULL,
INITIALS CHAR(3) NOT NULL,
BIRTH_DATE DATE,
SEX CHAR(1) NOT NULL
CHECK(SEX IN ('M','F')),
JOINED SMALLINT NOT NULL
CHECK(JOINED > 1969) ,
STREET CHAR(30) NOT NULL,
HOUSENO CHAR(4),
POSTCODE CHAR(6) CHECK(POSTCODE LIKE '______'),
TOWN CHAR(10) NOT NULL,
PHONENO CHAR(13),
LEAGUENO CHAR(4))
;
CREATE TABLE TEAMS
(TEAMNO INTEGER NOT NULL PRIMARY KEY,
PLAYERNO INTEGER NOT NULL,
DIVISION CHAR(6) NOT NULL
CHECK(DIVISION IN ('first','second')),
FOREIGN KEY (PLAYERNO) REFERENCES PLAYERS (PLAYERNO))
;
CREATE TABLE MATCHES
(MATCHNO INTEGER NOT NULL PRIMARY KEY,
TEAMNO INTEGER NOT NULL,
PLAYERNO INTEGER NOT NULL,
WON SMALLINT NOT NULL
CHECK(WON BETWEEN 0 AND 3),
LOST SMALLINT NOT NULL
CHECK(LOST BETWEEN 0 AND 3),
FOREIGN KEY (TEAMNO) REFERENCES TEAMS (TEAMNO),
FOREIGN KEY (PLAYERNO) REFERENCES PLAYERS (PLAYERNO))
;
CREATE TABLE PENALTIES
(PAYMENTNO INTEGER NOT NULL PRIMARY KEY,
PLAYERNO INTEGER NOT NULL,
PAYMENT_DATE DATE NOT NULL
CHECK(PAYMENT_DATE >= DATE('1969-12-31')),
AMOUNT DECIMAL(7,2) NOT NULL
CHECK (AMOUNT > 0),
FOREIGN KEY (PLAYERNO) REFERENCES PLAYERS (PLAYERNO))
;
CREATE TABLE COMMITTEE_MEMBERS
(PLAYERNO INTEGER NOT NULL,
BEGIN_DATE DATE NOT NULL,
END_DATE DATE,
POSITION CHAR(20),
PRIMARY KEY (PLAYERNO, BEGIN_DATE),
FOREIGN KEY (PLAYERNO) REFERENCES PLAYERS (PLAYERNO),
CHECK(BEGIN_DATE < END_DATE),
CHECK(BEGIN_DATE >= DATE('1990-01-01')))
;
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銆銆DML鈥旀暟鎹搷綰佃璦(SELECT錛孌ELETE錛孶PDATE錛孖NSERT)
銆銆DCL鈥旀暟鎹帶鍒惰璦(GRANT錛孯EVOKE錛孋OMMIT錛孯OLLBACK)
EXEC sp_addumpdevice 'disk', 'testBack', 'c:\mssql7backup\MyNwind_1.dat'
B錛歝reate table tab_new as select col1,col2鈥?from tab_old definition only
鐢?shù)鑴?A 1
鐢?shù)鑴?A 1
鍏夌洏 B 2
鍏夌洏 A 2
鎵嬫満 B 3
鎵嬫満 C 3
RNumber = Int(Rnd*499) +1
銆
While Not objRec.EOF
If objRec("ID") = RNumber THEN
... 榪欓噷鏄墽琛岃剼鏈?...
end if
objRec.MoveNext
Wend
RNumber = Int(Rnd*499) + 1
銆
SQL = "SELECT * FROM Customers WHERE ID = " & RNumber
銆
set objRec = ObjConn.Execute(SQL)
Response.WriteRNumber & " = " & objRec("ID") & " " & objRec("c_email")
SQL = "SELECT * FROM Customers WHERE ID BETWEEN " & RNumber & " AND " & RNumber & "+ 9"
Sql server:select top n * from 琛ㄥ悕 order by newid()
mysql select * From 琛ㄥ悕 Order By rand() Limit n
銆銆Access鏁版嵁搴擄細(xì)SELECT iif(len(field)>2,left(field,2)+'...',field) FROM tablename;
鎴戜滑鍙互閫氳繃緙栧啓瀛樺偍榪囩▼鏉ュ疄鐜拌嚜鍔ㄧ敓鎴怚d鐨勫姛鑳斤細(xì)
涓銆侀鍏堝緩绔嬫暟鎹簱鍜岃〃錛屽茍鍚戝叾涓彃鍏ヤ竴鏉℃暟鎹細(xì)
鍦ㄦ暟鎹被鍨嬬殑浼樺厛欏哄簭涓紝int聽(tīng)姣?varchar 楂橈紝璁$畻鏃跺洖寰楀埌int緇撴灉銆?/p>
聽(tīng)
鏌ヨ緇撴灉錛?br />
2銆佷笅闈㈡煡璇㈡煇寮犵壒瀹氳〃鐨勭粨鏋?/font>
鏌ヨ緇撴灉錛?br />
3銆佸鏋滆鏌ョ湅瑙嗗浘淇℃伅錛屽彧闇瑕佸皢SO.xtype = 'U'璇ヤ負(fù)SO.xtype = 'V' 鍗沖彲錛?/font>