compare two columns in sql

Tags: Io AR for on art CTI ad EF Key words: Merge compare Columns When we contact merge SQL in ETL, When we update some columns we shoshould compare the value change or not. We always write coalesce (columnname, valueifnull) But we shoshould take care of the valueifnul

How do you compare the size of two columns of numbers in an Excel table? 1, compared to the size of the two columns, such as the number of 2013 and 2012, if the 2013 month is larger than the number of 2012, the background is expressed 2, starting from C2, choose C2→c13. Note that the order is important 3. Start → conditional formatting → new r

First look at table one and table two below:Form one:Table Two:Here's how to add a column to table one, which describes the ascending and descending relationships between the first column and the second column of data and distinguishes it with arrows and colors.The first step:Insert a column, and write a name in the title, for example: Change trend, rise/fall, etc. can be.Step Two:Fill in the formula on the newly added column, such as D3=B3-C3, and then press and hold the D3 cell and drag it dow

function used to compare common CREATE FUNCTION [dbo].[fn_splitstringtotable] ( @s VARCHAR(Max), @split VARCHAR(Ten) ) RETURNS @re TABLE(IdINT IDENTITY(1,1), ValueVARCHAR( -) ) as BEGIN IF @s is NULL RETURN IF @split is NULL RETURN IF(LEN(@split)0) BEGIN INSERT into @re VALUES(@s) RETURN END DECLARE @splitlen INT SET @splitlen=LEN(@split)- 1 while CHARINDEX

Description of pseudo columns and pseudo columns in the SQL Server database. Pseudo columns in SQL Server In the afternoon, someone in the QQ group was discussing (non-clustered) index storage. For clustered index tables, the non-clustered index storage includes the index ke

Pseudo-Columns in SQL ServerQQ Group in the afternoon to see someone in the discussion (nonclustered) index storage,Say, for a clustered index table, the nonclustered index stores the index key value + the clustered index key value; For a nonclustered index table, the index stores the index key value +rowid, which should be a common sense, which is not elaborated in detail.The main point here is that the RO

Tags: arch count text EPO body TPS COM Comm ...Create and delete tables in an Access database with SQL statements; Add columns and delete columns Posted on2009-08-11 13:42 Yunbo Read (1240) Comments (0) Edit Collection Create and delete tables in an Access database with SQL statements; Add

Use SQL to change the data type of a table's columns and add new columns and ConstraintsModify a column of a database table or add a column--Add a columnALTER table name ADD column name VARCHAR (+) NULL--Delete a columnALTER table table name drop column name--Modify a columnALTER TABLE name ALTER COLUMN name VARCHAR (+) NULL--Modify the type of a columnALTER TABL

I have two tables, all of which are mobile phone numbers. Table A contains Table B. The col001 columns of both tables are mobile phone numbers, Table B of column col002 is a number and table A is 0. To compare the two tables, as long as the mobile phone number of Table B in Table A is used, Then, the number corresponding to col002 in Table B is automatically updated to col002 in table A. How can we use up

values into multiple rows, 　　 A string splitter function used to compare common CREATE FUNCTION [dbo].[fn_splitstringtotable] ( @s VARCHAR(Max), @split VARCHAR(Ten) ) RETURNS @re TABLE(IdINT IDENTITY(1,1), ValueVARCHAR( -) ) as BEGIN IF @s is NULL RETURN IF @split is NULL RETURN IF(LEN(@split)0) BEGIN INSERT into @re VALUES(@s) RETURN END DECLARE @splitlen INT S

With the introduction of new sparse column functionality in SQL Server 2008, it is now possible to declare a column as a sparse column and to enter a null value in the column at any time and it will not consume any space. One technique is to find out when to determine whether a column is defined as a sparse column. In the following example, address Lines 1 to 3 is required, address Lines 4 and 5 are not required but often used, and address Lines 6 to

, 2009 Monday pm) According to ' date of month, day of the week, morning afternoon 'Select Datename (Yy,getdate ()) + ' year ' +Datename (Mm,getdate ()) + ' month ' +Datename (Dd,getdate ()) + ' Day ' +Datename (Weekday,getdate ()) +Case when Datename (Hh,getdate ()) --2. Write the function, depending on the input time. The day of the year is outputSelect DATEPART (dy,getdate ())--3. Finding random output characters ' A-ZSelect char (97+abs (checksum (NEWID))%26)Select char (97+rand () *26)

When the beta version of the project is synchronized (deployed) to the official version, the structure of the two databases compared with the synchronization, if the database is not modified when modifying those tables, it is difficult to synchronize two of databasesRedgate SQL Compare usage Brief description:1. Compare and synchronize all objects in the database

SQL compare 10.2.0.1337 edition, one of the red gate series, database comparison tool, complete cracking + tutorial Red Gate SeriesArticle: SQL compare 10.2.0.1337 edition, one of the red gate series, database comparison tool, complete cracking + tutorial Red Gate Series ii S