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If Step 1 is invalid, proceed to step 3 else stop 3.Increase the existing "Email" column length from 100 characters to maximun(8000 characters) 4./*********************************************************************** Purpose: To change the Email column from Varchar Type To Xml Type and convert the existing records from varchar to xml types. Create a new Column by the name Email_Temp of type XML into the Employee Table 2. Rename Email_Temp column to Email ***********************************************************************/--===== Create Email_Temp column of type xml into the Employee table IF NOT EXISTS ( SELECT * FROM INFORMATION_SCHEMA.columns WHERE table_name = 'Employee' AND column_name = 'Email_Temp')BEGIN ALTER TABLE [dbo].[Employee] ADD Email_Temp XML NULLENDGO--===== Copy the Email contents from Email to Email_Temp column -- after proper conversion to xml type UPDATE [dbo].[Employee]SET Email_Temp = CAST(' All of this works the first time.Copy the Email contents from Email to Email_Temp column after proper conversion N. When we run the script a second time, SQL Server gets to Step 2 and executes the ALTER TABLE statement again.I had a problem - a had to update a column "rate" but if the existince or new value is greater then 5 this "5" will be finally value in field.So, I do it in one "magick" query ;)Here an example:"3" is a some value, from form or somethingupdate item set rate = case when round((rate 3)/2) You sometimes run into the problem that you want to replace a substring occuring in a column with a different string, without touching the rest of the string.Update the data in the "Email" column to the correct format N. PDF (US Ltr) - 38.1Mb PDF (A4) - 38.1Mb PDF (RPM) - 37.3Mb HTML Download (TGZ) - 10.2Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 8.9Mb Man Pages (TGZ) - 217.1Kb Man Pages (Zip) - 330.1Kb Info (Gzip) - 3.5Mb Info (Zip) - 3.5Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 My SQL 5.7 Secure Deployment Guide option as part of a table reference.

If you want to return the value before you updated it without using a seperate select (which unless you lock the table could return a different value than is updated) then you can use a mysql variable like this:update some_table set col = col 1 where key = 'some_key_value' and @value := col The @value := col will always evaluate to true and will store the col value before the update in the @value variable. Additional information on My SQL correlated subqueries is at UPDATE can apparently be used to implement a semaphore (pardon my pseudocode):while TRUE The code above waits until the semaphore is "cleared" (value = 0) and then "sets" it (value = 1).Let us say we have a table with one Email column of Type varchar (this is just for example sake as in real time there will not be any employee table with only one email column).The column size is being specified as a length of 100 (i.e. The polulated data contains some special characters like (&, We need to generate a script file for this that needs to be pass on to the QA guys and they will run it in their QA environment for further testing.This option takes a list of one or more partitions or subpartitions (or both).Only the partitions (or subpartitions) listed are checked for matches, and a row that is not in any of these partitions or subpartitions is not updated, whether it satisfies the clause, are flagged as unsafe for statement-based replication.

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