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數(shù)據(jù)庫常用函數(shù)(存儲(chǔ)版)

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【正文】 類型選擇自動(dòng)啟動(dòng)確定. ,定時(shí)同步 在srv1中創(chuàng)建如下的同步處理存儲(chǔ)過程 create proc p_process as 更新修改過的數(shù)據(jù) update b set name=,telphone= from b,author i where = and( or ) 插入新增的數(shù)據(jù) insert (id,name,telphone) select id,name,telphone from author i where not exists( select * from where id=) 刪除已經(jīng)刪除的數(shù)據(jù)(如果需要的話) delete b from b where not exists( select * from author where id=)go17。srv239。srv239。如果存儲(chǔ)過程中包含的一些語句并不返回許多實(shí)際的數(shù)據(jù),則該設(shè)置由于大量減少了網(wǎng)絡(luò)流量,因此可顯著提高性能。SQLOLEDB 39。SELECT * FROM 39。SQLOLEDB 39。用戶名 39。用戶名 39。用戶名 39。用戶名 39。ITSV 39。ITSV 39。ITSV 39。%表名%39。u39。 select top 10 recid from A where recid not in(select top 30 recid from A)分析:如果這樣寫會(huì)產(chǎn)生某些問題,如果recid在表中存在邏輯索引。SQL profiler39。+right(list,len(list)1)+39。,39。,39。 set OwnerName = OldOwner + 39。 = name, FROM sysfiles WHERE name = LogicalFileNameDROP TABLE DummyTransSET NOCOUNT OFF 說明:更改某個(gè)表exec sp_changeobjectowner 39。 ENDSELECT 39。 AND (OriginalSize * 8 /1024) NewSize INT, StartTime DATETIME, TruncLog LOG is 39。E:\39。select type,sum(case vender when 39。minute39。 二、提升說明:復(fù)制表(只復(fù)制結(jié)構(gòu),源表名:a 新表名:b) (Access可用)法一:select * into b from a where 11(僅用于SQlServer)法二:select top 0 * into b from a說明:拷貝表(拷貝數(shù)據(jù),源表名:a 目標(biāo)表名:b) (Access可用)insert into b(a, b, c) select d,e,f from b。 SQL: select , , , , , from a LEFT OUT JOIN b ON = B:right (outer) join: 右外連接(右連接):結(jié)果集既包括連接表的匹配連接行,也包括右連接表的所有行。當(dāng) ALL 隨 UNION 一起使用時(shí)(即 UNION ALL),不消除重復(fù)行。說明:創(chuàng)建視圖:create view viewname as select statement 刪除視圖:drop view viewname說明:幾個(gè)簡單的基本的sql語句選擇:select * from table1 where 范圍插入:insert into table1(field1,field2) values(value1,value2)刪除:delete from table1 where 范圍更新:update table1 set field1=value1 where 范圍查找:select * from table1 where field1 like ’%value1%’ like的語法很精妙,查資料!排序:select * from table1 order by field1,field2 [desc]總數(shù):select count as totalcount from table1求和:select sum(field1) as sumvalue from table1平均:select avg(field1) as avgvalue from table1最大:select max(field1) as maxvalue from table1最?。簊elect min(field1) as minvalue from table11說明:幾個(gè)高級查詢運(yùn)算詞A: UNION 運(yùn)算符 UNION 運(yùn)算符通過組合其他兩個(gè)結(jié)果表(例如 TABLE1 和 TABLE2)并消去表中任何重復(fù)行而派生出一個(gè)結(jié)果表。 1說明:使用外連接 A、left (outer) join: 左外連接(左連接):結(jié)果集幾包括連接表的匹配行,也包括左連接表的所有行。new_name39。說明:between的用法,between限制查詢數(shù)據(jù)范圍時(shí)包括了邊界值,not between不包括select * from table1 where time between time1 and time2select a,b,c, from table1 where a not between 數(shù)值1 and 數(shù)值2說明:in 的使用方法select * from table1 where a [not] in (‘值1’,’值2’,’值4’,’值6’)說明:兩張關(guān)聯(lián)表,刪除主表中已經(jīng)在副表中沒有的信息 delete from table1 where not exists ( select * from table2 where = )1說明:四表聯(lián)查問題:select * from a left inner join b on = right inner join c on = inner join d on = where .....1說明:日程安排提前五分鐘提醒 SQL: select * from 日程安排 where datediff(39。)2說明:列示type、vender、pcs字段,以type字段排列,case可以方便地實(shí)現(xiàn)多重選擇,類似select 中的case。go檢查備份集RESTORE VERIFYONLY from disk=39。 + db_name() + 39。MB39。 as NVARCHAR(128)DECLARE Owner = user_name(uid)from sysobjectswhere user_name(uid)=OldOwnerorder by nameOPEN insert into test (userid) values(i)原始密碼39。原始密碼39。select 39。+RTRIM(spid) FROM WHERE program_name IN(39。 DescN到結(jié)尾記錄Select Top N * From 表 Order by ID Desc案例例如1:一張表有一萬多條記錄,表的第一個(gè)字段 RecID 是自增長字段, 寫一個(gè)SQL語句, 找出表的第31到第40個(gè)記錄。print s exec sp_executesql s9:獲取當(dāng)前數(shù)據(jù)庫中的所有用戶表select Name from sysobjects where xtype=39。)兩種方式的效果相同11:查看與某一個(gè)表相關(guān)的視圖、存儲(chǔ)過程、函數(shù)select a.* from sysobjects a, sysments b where = and like 39。 15:不同服務(wù)器數(shù)據(jù)庫之間的數(shù)據(jù)操作創(chuàng)建
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