Sql updating table from same table


22-May-2015 13:26

sql updating table from same table-60

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The SQL Server (Transact-SQL) UPDATE statement is used to update existing records in a table in a SQL Server database.

There are 3 syntaxes for the UPDATE statement depending on whether you are performing a traditional update or updating one table with data from another table.

As a suggestion we can use instead of coaleasce we will use with ISNULL as well.

find the below example, drop table #test1 create table #test1 (abc varchar(100) NULL) insert into #test1 values(null) update #test1 set abc=coalesce(abc,1) where abc is null select * from #test1.

Something like this: I really hated that I was using two SQL statements and all that declaring to do a simple update, so I looked up the syntax for the UPDATE statement. So I tried this: I used the same table to update and to alias and it seemed to work.

Rit Yes, your last example code will work (you don't need the parinthesis around the where clause.

Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community.

I wrote about it back on Feb 22, 2011 : Problem with My SQL subquery Performing JOINs involving SELECTs and subquery SELECTs are OK.

sql updating table from same table-63

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I had to do a very simple Microsoft SQL query in which I wanted to update some of the values in a row from a row in the same table.Actually, the query was already there, but was using two local variables to store the information, then make the update. You are currently viewing the SQL Server 2000 section of the Wrox Programmer to Programmer discussions.This is a community of tens of thousands of software programmers and website developers including Wrox book authors and readers. By joining today you can post your own programming questions, respond to other developers questions, and eliminate the ads that are displayed to guests. Hi All This sort of leads on from another post of mine: COuld anyone advise me on what the SQL syntax would be to update 1 row with another rows data within the same table. UPDATE TABLE1 (COL1, COL2, COL3) WHERE COL1 = 7 With the data from TABLE1 (COL1, COL2, COL3) WHERE COL1 = 4 Many thanks!

Join them; it only takes a minute: Sign up UPDATE products_description AS pd SET pd.products_seo = ( SELECT pd2.products_seo FROM products_description AS pd2 WHERE pd2.language_id = 1 AND pd2.products_id = pd.products_id ) WHERE pd.language_id This is rather risky business, and I can understand why.It has to do with the way My SQL processes subqueries.



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