Sql updating joined tables
In particular, filter or join conditions applied on the result of one of those calls have no effect on the results of the other. The Microsoft SQL Server ODBC driver and OLE DB Provider for SQL Server automatically set ANSI_PADDING ON for each connection.
Specifies the condition to be met for the rows to be updated. This can be configured in ODBC data sources or by setting connection attributes or properties.
Bill Koster CSC/DECC" id="ctl00_m_m_i_ctl00_gr_ctl07_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5190413" / update (select a.i as a, b.i as b from a,b where a.i=b.i) set b=-1; HTH Ananthram" id="ctl00_m_m_i_ctl00_gr_ctl09_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5190429" / update a,b set a.col5=-1,a.col7=b.col7, a.col8 = b.col8 where a.col1 =b.col1 and a.col2=b.col2 it works much faster then using "exists" if there are indexes on link columns.
thanks Helen" id="ctl00_m_m_i_ctl00_gr_ctl11_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5190984" / I use this method: update a,b set a.col5=-1,a.col7=b.col7, a.col8 = b.col8 where a.col1 =b.col1 and a.col2=b.col2 it works much faster then using "exists" if there are indexes on link columns.
In recent times I have seen a developer writing a cursor to update a table. We want to update the value from Table2 to Table1 for the rows where Col1 is 21 and 31. I resolved this by providing the alias name after update query:: UPDATE Table1 SET Col2 = t2.
When asked the reason was he had no idea how to use multiple tables with the help of the JOIN clause in the UPDATE statement. Additionally, we want to update the values of Col2 and Col3 only.
We often use join clauses to query rows in a table that have (in the case of INNER JOIN) or may not have (in the case of LEFT JOIN) corresponding rows in another table.
This is one of the most interesting questions I keep on getting on this email and I find that not everyone knows about it. Our requirement is that we have Table2 which has two rows where Col1 is 21 and 31. Can you please let me know what are the cases multipart identifier error message will be shown.
Along with 14 years of hands on experience he holds a Masters of Science degree and a number of database certifications. For any SQL Server Performance Tuning Issue send email at [email protected]
Specifies the temporary named result set or view, also known as common table expression (CTE), defined within the scope of the UPDATE statement.
The CTE result set is derived from a simple query and is referenced by UPDATE statement.
As you can see that using JOIN clause in UPDATE statement it makes it very easy to update data in one table from another table. Col2 AS _Col2 FROM T1 JOIN T2 ON T1= T2/*Where clause added to exclude rows that are the same in both tables Handles NULL values correctly*/ WHERE EXISTS(SELECT T1.
You can additionally use MERGE statement to do the same as well, however I personally prefer this method.