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  • mysql和sqlserver的区别

      1 show variables like 'version'        查看版本
      2 
      3 1  4 DELIMITER $$ 开始   $$ DELIMITER 结束     其实就是告诉mysql解释器,该段命令是否已经结束了,mysql是否可以执行了。 
      5 默认情况下,delimiter是分号;。
      6 
      7 2:创建表:
      8 
      9 创建表:
     10         CREATE TABLE tb_student (
     11             id INT PRIMARY KEY auto_increment,                    //主键约束,自动增长
     12             NAME VARCHAR (18) NOT NULL,                            //非空约束
     13             sex VARCHAR (2) check(sex = '' or sex =''),
     14             age INT CHECK (age>18 AND age<60),                    //检查约束
     15             address VARCHAR (200),
     16             email VARCHAR (200) UNIQUE,                            //唯一约束
     17             tb_id  int,
     18         //外键约束, 自己的表名(自己的外键) REFERENCES 外部表名(字段)
     19         //CONSTRAINT FOREIGN KEY 外键名【表名+约束】(外键) REFERENCES 主表(字段)
     20             CONSTRAINT foreign KEY tb_student_fk(tb_id) REFERENCES tb_demp(id)
     21             )
     22     
     23 //建表之后添加外键约束
     24     ALTER TABLE tb_student
     25     ADD CONSTRAINT foreign KEY tb_student_fk(tb_id) REFERENCES tb_temp(id)    
     26 
     27 //设置自动增长
     28     alter table tb_student 
     29     modify column id int auto_increment
     30 
     31 
     32 mysql:
     33             DROP TABLE IF EXISTS Privilege;        删除表如果有,mysql判断存在不存在    用法:
     34                     1drop tableviewfunction.. if exists 名称
     35                     2, if exists(select * from ...)    then  end if
     36                     3,mysql判断表是否存在:
     37                     if EXISTS (select 1 from `INFORMATION_SCHEMA`.`TABLES` WHERE table_name ='AdvMaterial' and TABLE_SCHEMA=database())
     38                     database() :获取当前数据库的名称
     39                     4if (SELECT COUNT(*) FROM AdvMaterial) = NULL     判断记录是否为空,是空则不存在,但是括号中如果没有这张表则会报错
     40             
     41             CREATE TABLE Privilege(
     42                 PL_nPrivilegeID int NOT NULL,
     43                 PL_strDescription varchar(80) NOT NULL,
     44                 PL_nObjectID int NOT NULL DEFAULT 0,
     45                 PL_nObjectStatusID int NOT NULL DEFAULT 0,
     46                 PL_nOperationID int NOT NULL DEFAULT 0,
     47                 PL_nScope int NOT NULL DEFAULT 0,
     48                 PL_nParentOperation int NULL,
     49                 PL_nFunctionClass int NOT NULL DEFAULT 0,
     50                 CONSTRAINT PK_Privilage PRIMARY KEY CLUSTERED 
     51                 (
     52                     PL_nPrivilegeID ASC
     53                 )
     54             );
     55             
     56 创建表的知识点:
     57 1,默认0约束,default 0 ,不为空 not null 
     58 2,主键:primary key     asc 是递增,desc 是递减, PRIMARY KEY CLUSTERED  主键索引 ,CONSTRAINT约束
     59 3,FT_nTemplateID int IDENTITY(1,1) NOT NULL,        列3,FT_nTemplateID int类型 自动增长,每次增加1,不为空
     60 IDENTITY(1,1) 写为mysql是:
     61 FT_nTemplateID int  AUTO_INCREMENT NOT NULL,        mysql默认每次增加1
     62 4declare Mon int;   declare 申明 Mon 是int类型        sqlserver中直接把[],@等删掉 declare @pubdate datetime   declare pubdate datetime
     63 5,删除:
     64 delete PubInsertionDefine where PID_nPublicationID=@publicationid and PID_dtInsertion between @begindate and @enddate            //sqlserver
     65 delete PubInsertionDefine FROM PubInsertionDefine where PID_nPublicationID=publicationid and PID_dtInsertion between begindate and enddate;    //mysql
     66 
     67 -------------------------------------------------------------------------------------------------------------------------------------------------------
     68 触发器区别:
     69 1,mysql不能这样写   AFTER INSERT, UPDATE,不能after后面两个修改的操作
     70 mysql触发器用法:
     71 create trigger 触发器名称 on 表名 after insert/update for each row
     72 begin
     73 ...
     74 end;
     75 2, select @pubdate=@pubdate+1    ==   set pubdate=pubdate+1
     76 
     77 有定义declare就要有begin end
     78 
     79 sqlserver:    
     80     CREATE TRIGGER tri_PubDateInsert 
     81            ON  PubDate AFTER INSERT, UPDATE
     82         AS 
     83         BEGIN
     84         declare @pubdate datetime
     85         declare @publicationid int
     86         declare @begindate datetime
     87         declare @enddate datetime
     88         declare @Mon int
     89         declare @Tues int
     90         declare @Wed int
     91         declare @Thur int
     92         declare @Fri int
     93         declare @Sat int
     94         declare @Sun int
     95         declare @wday int
     96         declare @delete int
     97         select @publicationid=E_PDID, @begindate=E_BeginDate, @enddate=E_EndDate,
     98                @Mon=E_Mon, @Tues=E_Tues, @Wed=E_Wed, @Thur=E_Thur, @Fri=E_Fri, @Sat=E_Sat, @Sun=E_Sun, @delete=SYS_DELETEFLAG
     99           from INSERTED
    100         delete PubInsertionDefine where PID_nPublicationID=@publicationid and PID_dtInsertion between @begindate and @enddate
    101         select @pubdate=@begindate
    102         if @delete=0
    103         while @pubdate<=@enddate
    104         begin
    105           select @wday=datepart(weekday,@pubdate)
    106           if (@wday=1 and @Sun=1) or (@wday=2 and @Mon=1) or (@wday=3 and @Tues=1) or (@wday=4 and @Wed=1) or
    107              (@wday=5 and @Thur=1) or (@wday=6 and @Fri=1) or (@wday=7 and @Sat=1) 
    108             insert PubInsertionDefine values (@publicationid,@pubdate,'系统自动插')
    109           select @pubdate=@pubdate+1
    110         end
    111         END;
    112 
    113 mysql:
    114         DROP TRIGGER IF EXISTS `tri_PubDateInsert`;
    115         CREATE TRIGGER tri_PubDateInsert AFTER INSERT
    116            ON  PubDate 
    117         FOR EACH ROW
    118         BEGIN
    119         declare pubdate datetime;
    120         declare publicationid int;
    121         declare begindate datetime;
    122         declare enddate datetime;
    123         declare Mon int;
    124         declare Tues int;
    125         declare Wed int;
    126         declare Thur int;
    127         declare Fri int;
    128         declare Sat int;
    129         declare Sun int;
    130         declare wday int;
    131         declare deletee int;
    132         SET publicationid=E_PDID, begindate=E_BeginDate, enddate=E_EndDate,
    133                Mon=E_Mon, Tues=E_Tues, Wed=E_Wed, Thur=E_Thur, Fri=E_Fri, Sat=E_Sat, Sun=E_Sun, deletee=SYS_DELETEFLAG;
    134         delete PubInsertionDefine FROM PubInsertionDefine where PID_nPublicationID=publicationid and PID_dtInsertion between begindate and enddate;
    135         SET pubdate=begindate;
    136         if deletee=0 AND pubdate<=enddate 
    137         then set wday=datepart(weekday,pubdate);
    138         end if;
    139          
    140           if (wday=1 and Sun=1) or (wday=2 and Mon=1) or (wday=3 and Tues=1) or (wday=4 and Wed=1) or
    141              (wday=5 and Thur=1) or (wday=6 and Fri=1) or (wday=7 and Sat=1) 
    142             then insert PubInsertionDefine values (publicationid,pubdate,'系统自动插');
    143         end if;
    144           set pubdate=pubdate+1;
    145         END;
    146 
    147         
    148 -----------------------------------------------------------------------------------------------------------------------------------------------------
    149 视图的区别:
    150 mysql 视图的用法:create view 视图名 as select ..from .. where  ...
    151 条件判断语句  case when152 
    153 1154 IF  EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[AdDocument]'))
    155 DROP VIEW [dbo].[AdDocument];                    //判断是否有AdDocument这个视图,如果有就删除
    156 mysql:        DROP VIEW  if EXISTS AdDocument;
    157 
    158 2159     其中:
    160         convert(float,AI_PagePointX)        在msyql中convert 用法与sqlserver中正好相反  convert(float,AI_PagePointX) 变成convert(AI_PagePointX,DECIMAL)
    161         数据类型有几种不一样,分别是:decimal signed varchar   对应int float money char 等类型
    162 sqlserver:        
    163         IF NOT EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[PubDetail]'))
    164         EXEC dbo.sp_executesql @statement = N'create view [dbo].[PubDetail] as
    165         select SYS_DOCUMENTID PD_nDetailID, AI_InnerPageName PD_strPageName,
    166                convert(float,AI_PagePointX) PD_fPosX, convert(float,AI_PagePointY) PD_fPosY, case AI_IfFigSign when 1 then ''y'' else ''n'' end PD_bFigSign
    167           from AdvItem
    168          where SYS_DELETEFLAG=0';
    169 mysql:         
    170          DROP VIEW if EXISTS PubDetail ;
    171         create view   PubDetail as
    172         select SYS_DOCUMENTID PD_nDetailID, AI_InnerPageName PD_strPageName,
    173                convert(AI_PagePointX,DECIMAL) as PD_fPosX, convert(AI_PagePointY,DECIMAL) as PD_fPosY,
    174          case  when AI_IfFigSign = 1 then "y" else "n" end PD_bFigSign
    175           from AdvItem
    176          where SYS_DELETEFLAG=0 ;
    177          
    178 ------------------------------------
    179 3''n''''y'' 变成 "n" :
    180  
    181 IF NOT EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[AdItem]'))
    182 EXEC dbo.sp_executesql @statement = N'CREATE view [dbo].[AdItem] as
    183 select SYS_DOCUMENTID AI_nAdItemID, AI_OrderID AI_nOrderNo, case AI_IfFigSign when 0 then ''n'' else ''y'' end AI_cIfFigSign, 
    184        AI_PublishTime AI_dtPublishTime, ''y'' AI_cIfValid, AI_FlowReviseStatus+1 AI_nLockStatus,
    185        AI_Publication_ID AI_nPublicationID, AI_Edition_ID AI_nEditionID, AI_TradeID AI_nAdCategoryID,
    186        AI_ArticleID AI_nDocumentID, AI_PayMode_ID AI_nPayingCategory, convert(money,AI_AmountReceivable) AI_mAccountReceivable,
    187        convert(money,AI_AmountReceived) AI_mPayment, AI_Memo AI_strMemo, ''n'' AI_cIfChecked, 0 AI_nIfExam, AI_Brand_ID AI_nBrandID,
    188        AI_Customer_ID AI_nPayerID, case AI_IfCanceled when 0 then ''n'' else ''y'' end AI_cIfCanceled, 
    189        AI_AdType_ID AI_nAdTypeID, AI_Field_ID AI_nFieldID, AI_PubMemo AI_strPubMemo, AI_PageName AI_strPageName
    190   from AdvItem
    191  where SYS_DELETEFLAG=0';
    192 
    193   DROP VIEW if EXISTS AdItem ;
    194 create view   AdItem as 
    195 select SYS_DOCUMENTID AI_nAdItemID, AI_OrderID AI_nOrderNo, case AI_IfFigSign when 0 then "n" else "y" end AI_cIfFigSign, 
    196        AI_PublishTime AI_dtPublishTime, "y" AI_cIfValid, AI_FlowReviseStatus+1 AI_nLockStatus,
    197        AI_Publication_ID AI_nPublicationID, AI_Edition_ID AI_nEditionID, AI_TradeID AI_nAdCategoryID,
    198        AI_ArticleID AI_nDocumentID, AI_PayMode_ID AI_nPayingCategory, convert(AI_AmountReceivable,DECIMAL) AI_mAccountReceivable,
    199        convert(AI_AmountReceived,DECIMAL) AI_mPayment, AI_Memo AI_strMemo, "n" AI_cIfChecked, 0 AI_nIfExam, AI_Brand_ID AI_nBrandID,
    200        AI_Customer_ID AI_nPayerID, case AI_IfCanceled when 0 then "n" else "y" end AI_cIfCanceled, 
    201        AI_AdType_ID AI_nAdTypeID, AI_Field_ID AI_nFieldID, AI_PubMemo AI_strPubMemo, AI_PageName AI_strPageName
    202   from AdvItem
    203  where SYS_DELETEFLAG=0;
    204 
    205 
    206 ---------------------------------------------------------------------------------------------------------------------------------
    207 PROCEDURE  过程的区别:
    208 mysql不支持返回表,可以用其他方法代替,如临时表
    209 
    210 游标:
    211 select 要放在declare下面,
    212     qxCursor;游标的用法,如下:
    213     
    214     sqlserver:
    215                     CREATE  PROCEDURE [dbo].[usp_CheckUserPrivilege] 
    216                 @strUserID varchar(16), @nPrivilegeId INT AS
    217                 DECLARE @strName varchar(32)
    218                 DECLARE @chOk char(1)
    219                 SELECT @strName=user_strName FROM Users
    220                 WHERE user_strLoginName = @strUserID
    221                 declare @str varchar(255)
    222                 declare qxCursor cursor for 
    223                 select NRESOURCEID from FSYS_PERMISSION, FSYS_ROLEUSERRELATIONS
    224                  where NID=ROLEID
    225                    and NRESOURCETYPE='ADV_FIGOUT'
    226                    and USERCODE=@strUserID
    227                 open qxCursor
    228                 fetch next from qxCursor into @str
    229                 while (@@FETCH_STATUS <> -1) 
    230                 begin
    231                   IF EXISTS (select * from dbo.ufn_SplitToTable(@str) where n=@nPrivilegeId) 
    232                   BEGIN
    233                     SELECT @chOk='Y' 
    234                     break
    235                   END
    236                   ELSE
    237                     SELECT @chOk='N' 
    238                   fetch next from qxCursor into @str
    239                 end
    240                 close qxCursor
    241                 deallocate qxCursor
    242                 IF @strName is NULL
    243                 SELECT @chOk='F' 
    244                 SELECT @strName, @chOk;
    245     mysql:
    246     
    247 while 的用法:
    248 while do
    249 end while
    250 
    251 if:用法
    252 if then;
    253 else
    254  
    255 end if
    256   
    257  while 例子:
    258 DROP PROCEDURE if EXISTS test_while;
    259 CREATE PROCEDURE test_while(in in_count INT)
    260 BEGIN
    261 DECLARE count int DEFAULT 0;
    262 WHILE count<10    do 
    263 set count = count +1;
    264 end WHILE;
    265 SELECT count;
    266 END
    267 
    268 exg:
    269             DROP PROCEDURE IF EXISTS usp_CheckUserPrivilege;
    270             CREATE  PROCEDURE usp_CheckUserPrivilege 
    271                     (
    272                     strUserID varchar(16), nPrivilegeId INT 
    273                     )
    274                     BEGIN
    275                     DECLARE strName varchar(32);
    276                     DECLARE chOk char(1);
    277 
    278                     declare str varchar(255);
    279                     declare qxCursor cursor for             申明一个游标
    280                     select NRESOURCEID from FSYS_PERMISSION, FSYS_ROLEUSERRELATIONS
    281                      where NID=ROLEID
    282                          and NRESOURCETYPE='ADV_FIGOUT'
    283                          and USERCODE=strUserID;
    284                     SELECT strName=user_strName FROM Users
    285                     WHERE user_strLoginName = strUserID;
    286 
    287                     open qxCursor;                        打开
    288             READ_loop:LOOP                                开始遍历
    289                     fetch next from qxCursor into str;
    290                     while (FETCH_STATUS <> -1) DO
    291                      IF (  EXISTS (select * from ufn_SplitToTable where n=nPrivilegeId))        -- ---ufn_SplitToTable(这个方法未完成,返回表),ufn_SplitToTable(str),参数没有传str
    292             THEN 
    293 
    294             SELECT chOk='Y' ;
    295             ELSE 
    296                 SELECT chOk='N';
    297             END IF;
    298             FETCH next FROM qxCursor into str;            
    299                     END WHILE;
    300             END LOOP;                                    关闭
    301                     --  close qxCursor;
    302                                                                                                                 -- deallocate qxCursor
    303                     IF strName is NULL
    304             THEN
    305                     SELECT chOk='F' ;
    306                     SELECT strName, chOk;
    307             END IF;
    308                     END;
    309 ------------------------------------------
    310 临时表:(3,usp_CopyReserve)
    311 
    312 直接将查询结果导入临时表
    313 CREATE TEMPORARY TABLE tempresv AS SELECT * FROM FigReserve;
    314      truncate TABLE tmpTable;  -- 使用前先清空临时表。
    315 ltrim(AI_ArticleID),        去掉左边空格字符
    316 
    317 临时表实例:
    318 CREATE PROCEDURE sp_test_tt(IN i_chars VARCHAR(50),OUT o_counts BIGINT)  
    319 BEGIN  
    320          create temporary table if not exists tmpTable 
    321          (  
    322            objChk varchar(255) primary key,  
    323            ModelName varchar(50),  
    324            Operator varchar(500),  
    325            PModelName varchar(50)  
    326          );  
    327          truncate TABLE tmpTable;  -- 使用前先清空临时表。  
    328    
    329          insert into tmpTable values(i_chars,i_chars,i_chars,i_chars);  
    330          insert into tmpTable values(i_chars,i_chars,i_chars,i_chars); -- 语句1  
    331          select * from tmpTable; -- 语句2  
    332          select count(*) into o_counts from tmpTable; -- 语句3  
    333 END; 
    334 
    335 
    336     sqlserver:
    337             CREATE  PROCEDURE [dbo].[usp_CopyReserve]
    338             @nPubMask INT, @nGridID INT,@nEditionID INT,
    339             @strOldDay VARCHAR(16), @strNewDay VARCHAR(16) AS
    340             SELECT * INTO #tempresv FROM FigReserve
    341             WHERE
    342             FigReserve.FR_dtPubDate = @strOldDay and
    343             FigReserve.FR_nPubMask = @nPubMask and
    344             FigReserve.FR_nGridID = @nGridID and
    345             FigReserve.FR_nEditionMask = @nEditionID
    346             UPDATE #tempresv
    347             SET FR_dtPubDate=@strNewDay
    348             INSERT INTO FigReserve
    349             SELECT * FROM #tempresv;
    350     mysql:
    351             DROP PROCEDURE IF EXISTS usp_CopyReserve;
    352             CREATE  PROCEDURE usp_CopyReserve
    353             (
    354             nPubMask INT, nGridID INT,nEditionID INT,
    355             strOldDay VARCHAR(16), strNewDay VARCHAR(16) 
    356             )
    357             BEGIN
    358             DROP TABLE IF EXISTS tempresv;
    359             CREATE TEMPORARY TABLE tempresv AS SELECT * FROM FigReserve;
    360              truncate TABLE tmpTable; 
    361 
    362             INSERT INTO tmpTable SELECT * FROM FigReserve
    363             WHERE
    364             FigReserve.FR_dtPubDate = strOldDay and
    365             FigReserve.FR_nPubMask = nPubMask and
    366             FigReserve.FR_nGridID = nGridID and
    367             FigReserve.FR_nEditionMask = nEditionID;
    368 
    369             UPDATE  tempresv
    370             SET FR_dtPubDate=strNewDay;
    371             INSERT INTO FigReserve
    372             SELECT * FROM tempresv;
    373 
    374             END;
    375 
    376 
    377 事务:
    378     sqlserver:
    379             CREATE PROCEDURE [dbo].[usp_getserialex] @serialname varchar(20), @nResult INT OUTPUT AS
    380             begin
    381             declare @serialno int
    382             begin transaction
    383             select @serialno = E5VALUE from E5ID with(TABLOCKX HOLDLOCK) where E5IDENTIFIER = @serialname
    384             if @serialno is null
    385             begin
    386             commit
    387             --raiserror 50010 'SystemVariable lack record'
    388             end
    389             else
    390             begin
    391             update E5ID set E5VALUE = @serialno+1 where E5IDENTIFIER = @serialname
    392             commit
    393             SELECT @nResult = @serialno+1    
    394             end
    395             end;
    396             end;
    397 
    398     mysql:
    399 
    400             DROP PROCEDURE if EXISTS usp_getserialex;                                                                        
    401             CREATE PROCEDURE usp_getserialex 
    402             (
    403             serialname varchar(20), OUT nResult INT  
    404             )
    405             begin
    406             declare serialno int;
    407             START transaction;                -- TRANSACTION   mysql用start(开始事务)                where 前with(TABLOCKX HOLDLOCK)
    408             select serialno = E5VALUE from E5ID  where E5IDENTIFIER = serialname;
    409             if serialno is null
    410             then
    411             commit;
    412             -- raiserror 50010 'SystemVariable lack record'
    413             else
    414             update E5ID set E5VALUE = serialno+1 where E5IDENTIFIER = serialname;
    415             commit;
    416             SELECT nResult = serialno+1    ;
    417             end if;
    418             end;
    419 
    420 function 的区别:
    421 mysql function中不能用select
    422 
    423 ifnull:的用法,代替sqlserver中的isnull
    424 ifnull函数,如果字段不为null,则取第二个值,如果为空,取第三个值
    425 select comm,ifnull(comm,comm+100,100)    as comm2 from tb_emp;
    426 
    427 ifnull函数,如果字段不为null,则直接返回该值,如果为空,取第二个
    428 select comm,ifnull (comm,100)as comm2 from tb_demp;
    429 
    430 
    431     sqlserver:
    432                         CREATE FUNCTION [dbo].[oms_getAdvMaterialOriginalPath] 
    433                 ( 
    434                     @AdvID numeric(10,0)
    435                 ) 
    436                 RETURNS VARCHAR(4000) 
    437                 AS
    438                 BEGIN
    439                    DECLARE @matUrl VARCHAR(4000)
    440                    IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[AdvMaterial]') AND type in (N'U'))
    441                    begin
    442                         RETURN @matUrl
    443                    end
    444 
    445                    select @matUrl=isnull(@matUrl+',','')+AdvMaterial_Attachment.ATT_OriginalPath
    446                    from AdvItem,AdvMaterial,AdvMaterial_Attachment
    447                    where AdvItem.AI_ArticleID=AdvMaterial.SYS_DOCUMENTID 
    448                    and AdvMaterial.SYS_DOCUMENTID=AdvMaterial_Attachment.ATT_MaterialID
    449                    and AdvItem.SYS_DOCUMENTID=@advID
    450                    and AdvMaterial.SYS_DELETEFLAG=0
    451                    and AdvMaterial_Attachment.SYS_DELETEFLAG=0
    452 
    453                    RETURN @matUrl 
    454                 END;
    455 
    456     mysql:
    457                     CREATE FUNCTION oms_getAdvMaterialOriginalPath 
    458             ( 
    459                 AdvID numeric(10,0)
    460             ) 
    461             RETURNS VARCHAR(4000) 
    462             BEGIN
    463                DECLARE matUrl VARCHAR(4000);
    464              -- if (select table_name from `INFORMATION_SCHEMA`.`TABLES` where table_name ='AdvMaterial' and TABLE_SCHEMA='omstest') = NULL
    465              if EXISTS (select 1 from `INFORMATION_SCHEMA`.`TABLES` WHERE table_name ='AdvMaterial' and TABLE_SCHEMA=database())        //判断存在
    466 
    467             THEN
    468                select ifnull(matUrl+',','')+AdvMaterial_Attachment.ATT_OriginalPath into matUrl                    //isnull,ifnull
    469                from AdvItem,AdvMaterial,AdvMaterial_Attachment
    470                where AdvItem.AI_ArticleID=AdvMaterial.SYS_DOCUMENTID 
    471                and AdvMaterial.SYS_DOCUMENTID=AdvMaterial_Attachment.ATT_MaterialID
    472                and AdvItem.SYS_DOCUMENTID=advID
    473                and AdvMaterial.SYS_DELETEFLAG=0
    474                and AdvMaterial_Attachment.SYS_DELETEFLAG=0;
    475             end if;
    476               RETURN matUrl;
    477             END;
    478     ----------------------------        
    479     select区别:
    480     
    481 1SELECT @A_Area=ISNULL(SUM(AI_AdvPages),0) FROM AdvItem WHERE SYS_DELETEFLAG=0 AND AI_IfCanceled=0 AND AI_PublishTime=@APubDate AND AI_Publication_ID=@APubID
    482     
    483 2SELECT IFNULL(SUM(AI_AdvPages),0) into A_Area
    484 FROM AdvItem 
    485 WHERE SYS_DELETEFLAG=0 AND AI_IfCanceled=0 AND AI_PublishTime=APubDate AND AI_Publication_ID=APubID;
    486     
    487 ------------------------------------------------------------------------------------------------------------------------------------------------    
    488     index区别(p5):
    489     索引:
    490 作用:在数据库中来加速对表的查询
    491 创建:自动在主键和唯一键上面创建索引
    492 
    493 手动创建:create index index_tb_student_name
    494 on tb_student(stu_name)
    495 
    496 使用索引,在where之后加上索引,提高查询效率
    497 
    498 
    499 SHOW INDEX FROM AdvDoc;                显示这张表中的所有索引
    500 
    501 CREATE INDEX IDX01_AdvDoc ON AdvDoc(F_OrderID);            添加这张表的索引
    502 
    503 CREATE INDEX IDX01_AdvDoc ON AdvDoc(F_OrderID, F_Size_ID, F_Color_ID, F_Width, F_Height, F_Content);
    504 
    505 SHOW INDEX FROM AdvDoc;                    显示所有索引
    506 
    507 DROP INDEX IDX01_AdvDoc ON AdvDoc;            删除索引,根据索引名称
    508 
    509     
    510         ALTER TABLE [dbo].[AdvItem] DROP CONSTRAINT [PK_AdvItem];  
    511     变:
    512         ALTER TABLE AdvItem DROP primary key;
    513         
    514     
    515     ALTER TABLE [dbo].[AdvItem] ADD  CONSTRAINT [PK_AdvItem] PRIMARY KEY NONCLUSTERED 
    516 (
    517     [SYS_DOCUMENTID] ASC
    518 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY];
    519 
    520 Alter table AdvItem add primary key(SYS_DOCUMENTID);
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  • 原文地址:https://www.cnblogs.com/xiaoxiao5ya/p/4866483.html
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