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The column values returned by the subquery are assigned to the columns in the column list in order. WHERE search_condition Chooses which rows to update in the database table.The first value is assigned to the first column in the list, the second value is assigned to the second column in the list, and so on. Only rows that meet the search condition are updated.Hi Tom, Due to migration to new system we have to change all our account numbers. June 28, 2005 - pm UTC yes, the predicate in the join for the fictional question without a sample table and data was wrong (everytime I wing it, try to answer WITHOUT TESTING, it comes out wrong. test cases are relevant :) Hi Tom, Thanks for answering my question. ( Client number is consist of branch, Number, Sub Number Currency Code ) We have one big transaction table around 1 million records, having many columns, and at many places client numbers are stored from account master under various columns 1. You told me to use update ( select old.old_account_number, new.new_account_number from old_table old, mapping_table new where old.old_account_number = new.old_account_number ) set old_account_number = new_account_number; But I think my questions still reamin unanswered 1. In your answer only one number say client number will get updated. If it does, then only one of the join rows will be used to update the target row, but which one will be used is not readily predictable.Because of this indeterminacy, referencing other tables only within sub-selects is safer, though often harder to read and slower than using a join. [1] Set the value of column C1 in table T to 1, only in those rows where the value of column C2 is "a".

In the case where the application server and database server are on different hosts, the round-trip will involve network latency as well.Secondly you have shown me to update table with "KEY PRESERVED" method. IT NEEDS THIS LOGICALLY regardless of the method used, so just add it (for if a row in OLD joins to more than one row in NEW -- you are hosed, you cannot update this data, therefore NEW has a unique/primary key, add it to facilitate the update) I had a similiar query and i tried applying to my tables. If it is not possible can you show me how to write "GOOD" sql ? i.e, one column of a table should get updated from another column of another table. Let us start with a simple table: UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1200 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1200 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1250 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1250 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; We are no longer setting all the salary fields to the same value, so we can’t collapse it into a single statement.But we can group the updates according to the value being set, and then do one UPDATE statement per distinct value.I would like to update the "Location Code" values in one table with the the "Location Code" of the other table. It is impractical for me to update one row at a time. found the solutions...actually if the tables lie in different dbs then create temp table in db X that contain the data of table B from db Y this way our both tables now in same db as X now simply we can update from one table to another as usual Varinder Sandhu, found the solutions...actually if the tables lie in different dbs then create temp table in db X that contain the data of table B from db Y this way our both tables now in same db as X now simply we can update from one table to another as usual found the solutions...actually if the tables lie in different dbs then create temp table in db X that contain the data of table B from db Y this way our both tables now in same db as X now simply we can update from one table to another as usual hi 999baz,it depends, doing this update you will lock a big chunk of data.First of all you must test it, use your development DB and test with 10000 rows, 100000 rows, or yours 2500000 rows, and estimate the time needed to complete the task.I have two tables which are different with the exception of a single field (column name = "Location Code").Both tables can also be joined with a common id field. The subquery must return exactly one row that includes all the columns listed.The column values returned by the subquery are assigned to the columns in the column list in order. etc I have a mapping table where "ALL" old account number and new account numbers are present. But Sales Supplier, Purchase supplier, Wholesale Supplier ..many other columns how can i update in single SQL ( I have to update around 70 columns and some columns may have null values such as Purchase supplier ..) 2. You need to have the table you are updating from have a unique or primary key constraint. If you omit this clause, all rows in the table are updated. In some databases, such as Postgre SQL, when a FROM clause is present, what essentially happens is that the target table is joined to the tables mentioned in the fromlist, and each output row of the join represents an update operation for the target table.




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