Pinal Dave is a SQL Server Performance Tuning Expert and an independent consultant.
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.
When you look at this it looks very simple but when we try to think the solution, I have seen developers coming up with many different solutions for example sometime they write cursor, table variables, local variables etc.
00000 - "%s: invalid identifier"update ( select old. What if i need to update a table using data from an external table?
WORKEXTENSION; But I was getting following error, by the Im on 10g R2 SQL Error: ORA-00904: "NEW"."WORKEXTENSION": invalid identifier 00904. Dear Tom, You mentioned previously that we need to have the table we are updating from to have a unique or primary key constraint.
qty I want to update ORDERED_ITEMS table for a few records but exclude any book where BOOKS.bk_flag='X' Would you do this UPDATE ordered_item SET qty = new_qty WHERE order_date = xxxx and cust_id = xxxx and bkno not in (select bkno from books where bk_flag May 06, 2008 - am UTC tell me how you would do an update on a join here? ITEM_NO * ERROR at line 4: ORA-00904: "CLASS_TEST"."ITEM_NO": invalid identifier Any help will be appreciated. If i am updating & using non key preserved tables then exists seems to be quicker one! update account_allocation2 set (sup_hyg_acc_policy,sup_hyg_acc_add)= ( select sup_hyg_acc_policy,sup_hyg_acc_add from acc_hyg_driver where acc_hyg_driver.account_number = account_allocation2.account_number and exists ( select '1' from acc_hyg_driver where acc_hyg_driver.account_number = account_allocation2.account_number )) any ideas?? merge into account_allocation2 using acc_hyg_driver on (acc_hyg_driver.account_number = account_allocation2.account_number) when matched then update set sup_hyg_acc_policy = acc_hyg_driver.sup_hyg_acc_policy, sup_hyg_acc_add = acc_hyg_driver.sup_hyg_acc_addmerge into account_allocation2 using (select * from acc_hyg_driver where account_number in (select account_number from account_allocation2) acc_hyg_driver on (acc_hyg_driver.account_number = account_allocation2.account_number) when matched then update set sup_hyg_acc_policy = acc_hyg_driver.sup_hyg_acc_policy, sup_hyg_acc_add = acc_hyg_driver.sup_hyg_acc_add when not matched then insert (account_number) values ( null )the "using" query only needs to use the IN if acc_hyg_driver might have account numbers that are NOT IN account_allocation2, if acc_hyp_driver only has account numbers in that set, you can just use that table. But the volumes dealt with are account_allocation has 16 million acc_hyg_driver has 6 million and the update does around 6 million records, The current merge takes more than 5 hours with other bottle necks ( includes CPU sharing) which cant be helped!
ID = @parameter Hope I succeded in making it clearer.
It will be vastly faster and more understandable.i have two tables names DETAILS and STATUS DETALIS contains eid,ename,sal and STATUS contains eid,sal,updationdate. Only nc type amt2 column in table1 should be updated 2.
You have 200 over them in the dictionary, generate code for run said code Tony Fernandez, if you are merging data into another table, don't use a cursor at all - If at all possible, query user_tab_columns to build a native dynamic MERGE statement to do the data move. :) Hi Tom, There are 2 tables Table1 type cpty amt1 amt2 c a 10 0 c a 20 0 nc a 30 0 nc a 40 0 c b 50 0 c b 60 0 nc b 70 0 nc b 80 0 Table2 amt A cpty 100 a 115 a 120 a 125 b 130 b 140 b Trying to write an single update statement that will do the following 1.
If you are at the conference, drop into the Groundbreaker area and say Hello. etc I have a mapping table where "ALL" old account number and new account numbers are present.
Check out all our database development sessions at OOW19 Thanks for the question, Parag Jayant Patankar. I have to update a transaction table where mapping is existing with old account no and new account number.
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.