sql query to compare two columns in same table

No matter what database I use, duplicate data exists. Next I will introduce in detail various methods and Performance Analysis for deleting duplicate records in Oracle tables, for more information, see. Method: The Code is as follows: Copy code Group by XX having count (*)> 1, rowid, distinct, temporary table, procedure The following statement can query the data that is duplic

/*Normal row and column conversionsLet's say a student score table (TB) is as follows:Name Subject ResultZhang San language 74Zhang San Mathematics 83Zhang San Physics 93John Doe Language 74John Doe Mathematics 84John Doe Physics 94*/-------------------------------------------------------------------------/*Want to becomeName Chinese mathematics Physics---------- ----------- ----------- -----------Lee 474 84 94Sheet 374 83 93*/CreateTable TB(Name varc

Tags: assign ble. com ROM Presence nbsp query condition ASEMaster these, it's more advanced. Using the same Table twice such as the Branch field in the following query SELECTa.account_id, e.emp_id, B_a.name open_branch, B_e.name emp_branch fromAccount asAINNER JOINBranch asB_a ona.open_branch_id=b_a.branch_idINNER JOINEmployee asE ona.open_emp_id=e.emp_idINNER JO

There are three of tablesDiscuss_tableTalk_tableUser_tableYou can then query all the contents of three tables or query some of the contents. The following statement is tested, take it out and share it!SELECT * FROM (select Row_number () over (order by d_id Desc) as rownum,a.*,b.*,c.* from (discuss_table as a inner join TALK_TA ble as B on a.titleid=b.t_id) join User_table as C on a.user_id=c.u_id where c.us

Three sheets Title Table topic, field to_id to_title Knowledge Point table tag, field t_id T_title Association table relation, field to_id t_id Each topic can have multiple knowledge points Now the Web interface provides search box, 10 small questions per page, users can choose more knowledge points, encountered the problem is that there is duplicate

--Cross join produces a Cartesian value (x*y) SELECT * from Student crosses Join dbo. ClassInfo--Another way of writing select * from Student, ClassInfo--INNER join (Inner can omit) select *from Student JOIN dbo. ClassInfo on dbo. Student.class = dbo. classinfo.id;--Inner Join SELECT *from Student Inner join dbo. ClassInfo on dbo. Student.class = dbo. Classinfo.id; --on condition, usually the primary foreign key, but not limited to the primary foreign key--on condition, which allows multiple, a

1 Public functionGet_search ($page=1){2 $slide=$_post[' Slide '];3 $page=Trim($page);4 $arr=$this->m->get_all ("Select a.* from ' Lx_z_news ' as a where a. ' title ' like '% ').$slide." % ' UNION ALL SELECT b.* from ' lx_z_product ' as B where B. ' title ' Like '% '.$slide." %‘ ");5 $row=Count($arr);6 $page 2=page ($page,$row, 10);7 $select _from=$page 2[' Select_from '];8 $select _limit=$page 2[' Select_limit '];9 $arr 1=$this->m->get_all ("Select ' A ' tbname,a.title,a

Label: string text = "SELECT * from [admin] where aa=1 and cc= ' B ' ORDER by AA Desc";Regex reg = null; reg = new Regex (@ "\s+from\s+.*?" ( \s+where\s+|\s+order\s+|\s+group\s+) |\s+from\s+.+ ", regexoptions.ignorecase);string table = Reg. Match (text). Value; Table = Regex.Replace (table. ToLower (), @ "\s+from\s+|\s+where\s+|\[|\]|\s+order\s+|\s+group\

SQL Script: DECLARE @ tablespaceinfo TABLE (Nameinfo varchar (50 ),Rowsinfo int,Reserved varchar (20 ),Datainfo varchar (20 ),Index_size varchar (20 ),Unused varchar (20)) DECLARE @ tablename varchar (255 );DECLARE Info_cursor CURSORSELECT [name] FROM sys. tables WHERE type = 'U ';OPEN Info_cursorFetch next from Info_cursor INTO @ tablenameWHILE @ FETCH_STATUS = 0BEGINInsert into @ tablespaceinfo exec sp_

1 SelectB.name2 fromdbo.syscomments A, dbo.sysobjects b3 wherea.ID=b.ID andB.xtype='P' andA.text like '% @tempGoods%'4 Order byNameXtype representative TypeC = CHECK ConstraintD = defaults or DEFAULT constraintsF = FOREIGN KEY constraintL = LogFN = Scalar functionIF = Inline Table functionP = Stored ProcedurePK = PRIMARY KEY constraint (type is K)RF = copy Filter stored procedureS = System tableTF = Table