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Updating table from another table

How to copy values from table A to table B in the same database?What is the syntax of the SQL UPDATE statement to update field values from one table to another?Using cursor is ok, but it brings with a un-toleratable speed when operating on a large table. end loop End; It's working but taking a huge time/sometimes hang the computer. [email protected] update ( select upd.purchase_no u_pno, upd.amount u_a, 2 temp.purchase_no t_pno, temp.amount t_a 3 from upd, temp 4 where upd.urefitem = temp.urefitem ) 5 set u_pno = t_pno, u_a = t_a 6 / 635 rows updated. Is this time, 10 minutes for 12000 rows tables an acceptable (expected) time? Thanks Anandhi = b.cycle and b.site_id=44 and b.rel_cd in('code1','code2','code3') and b.groupid='123' 12,000 times?Even the idea create a temporary table holding only primary key and Column b, and then apply cursor to it is slow. Would u please help me how can i faster my procedure.u have given information 9i it same for oracle8i & dev6i.please help me Thank u very much for ur kind update information is really nice and working very insert----same prolem. That means -- just using math here -- that we have 600 seconds, 12,000 queries to run, 12000/60 = 20, so we are doing 20 per second -- or each query is taking 0.05 cpu seconds to run. do anything 12,000 times and you might have a problem tho! this might be one of the rare times that a temp table can be useful.Any sample code provided on this site is not supported under any Progress support program or service. Progress makes no warranties, express or implied, and disclaims all implied warranties including, without limitation, the implied warranties of merchantability or of fitness for a particular purpose.The entire risk arising out of the use or performance of the sample code is borne by the user.

It will need the primary key constraint on B though, if you do not have one BUT is unique, you can: [email protected] I can think of another instance (at least with v8.1.5) where the second example (updating the table via a subquery) works better than the first example (updating the joined tables). My last PL/SQL code was just a test as i was interested more in the performance during update, so i missed the commit point. REGISTRATION where vistemp.registration.bin=vis.registration.bin) /am i right? Whenever anyuser insert/update anything,system date is inserted with them and i am exporting that data by using that system date."AM I IN RIGHT WAY? Another table summary of orders tt1 which is having current year summation and respective previous year summation columns. Type ------------------------------- -------- ------------ ORDER_NUMBER NUMBER(10) ORDER_DATE DATE CY_ORD_AMT NUMBER PY_ORD_AMT NUMBER Order date is current year date.How to replicate data in SQL-92 between 2 existing tables in the same database.Following is the syntax to UPDATE the Balance field of the Customer table from the Balance field of another table my Customer.In no event shall Progress, its employees, or anyone else involved in the creation, production, or delivery of the code be liable for any damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information, or other pecuniary loss) arising out of the use of or inability to use the sample code, even if Progress has been advised of the possibility of such damages.This may seem like a simple question: Update Column a1 in Table A with all data in Column b1 in Table B. I have a table named A containing say 100000 records. HSCODELIST 5 WHERE not exists 6 (SELECT NULL FROM VIStemp. Brao what I suggest then is not to do it in a single sql statement -- just proving that "there are exceptions to every rule". Type ----------------------------------------- -------- ---------------------------- BIN VARCHAR2(10) ACT_SL VARCHAR2(3) ACT_CODE VARCHAR2(11) ACT_VAL NUMBER(14,2) ENTRY_DATE DATE SQL DESC VIS. Type ----------------------------------------- -------- ---------------------------- BIN VARCHAR2(10) ACT_SL VARCHAR2(3) ACT_CODE VARCHAR2(11) ACT_VAL NUMBER(14,2) ENTRY_DATE DATE SQL UPDATE (SELECT DBHSCODELIST. the database needs to know that each row in dbhscodelist will map to AT MOST one row in hscodelist - this mandates a primary or unqiue key constraint on the join columns this is discussed in the original answer above.But I am trapped by the method that without using cursor to achieve it. I have another table B containg 10,000 records of incremented and edited records of A table. I am using the following codes to append data from B to A. Normally, I would try to use a single sql statment -- here, due to the "data being spread all over the place", and being distributed and all. We have a 2 CPU machine where at normal times, the topmost entry in top command shows only .2 or .3 percentage of CPU use. This is on a test database where nothing else is going on concurrently.There are one column in each table, call id, to link them. --For incremental/New data----- insert into A select * from B where column_name NOT IN (select column_name from B); --For Edited Data------- cursore C_AB select * from B minus select * from A For R in C_AB loop Update A set....where ... this shows how I would approach getting the first two columns -- just add the other 2 and use merge to keep filling temp -- and then update the join: [email protected] -1 5 group by urefitem ) b 6 on (temp.urefitem = b.urefitem) 7 when matched then update set amount = b.sum_total 8 when not matched then insert (urefitem,amount) values ( b.urefitem, b.sum_total) 9 / 398 rows merged. using a cursor means you are back to "slow=very_true" you already WERE updating on a bulk basis??? But when I run the following query, it takes up 50% of CPU. tab A has these columns: id, cycle, pop tab B has these columns: id, cycle, site_id,rel_cd,groupid update tab A a set pop= (select count(*) from tab B b where b.id=and a.cycle = b.cycle and b.site_id=44 and b.rel_cd in('code1','code2','code3') and b.groupid='123') where pop is null and id in(select id from tab B); call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.00 0 0 0 0 Execute 2 496.35 499.54 7530955 9902630 76532 11444 Fetch 0 0.00 0.00 0 0 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 3 496.35 499.54 7530955 9902630 76532 11444 Misses in library cache during parse: 0 Optimizer goal: CHOOSE Parsing user id: 305 Rows Row Source Operation ------- --------------------------------------------------- 1 UPDATE tab A 11445 MERGE JOIN 5942 VIEW VW_NSO_1 5942 SORT UNIQUE 31227 TABLE ACCESS FULL tab B 17385 SORT JOIN 12601 TABLE ACCESS FULL tab A Now my questions are: 1. We have several such updates that creates the same problems on the server from time to time and I would appreciate some guidance to resolve this.How to update Columns from one table using data from another with SQL?How to UPDATE certain records from a table using data from related records in another table of the same database?Because of the restriction on the CATGROUP column, only one row qualifies for the update (although four rows qualify for the join).update category set catid=100 from event where event.catid=category.catid and catgroup='Concerts'; select * from category where catid=100; catid | catgroup | catname | catdesc ------- ---------- --------- --------------------------------- 100 | Concerts | Pop | All rock and pop music concerts (1 row) The advantage to this approach is that the join criteria are clearly separated from any other criteria that qualify rows for the update.

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  1. Sep 13, 2015. What is the syntax of the SQL UPDATE statement to update field values from one table to another? How to replicate data in SQL-92 between 2.

  2. Update the original 11 rows in the CATEGORY table by extending the previous example and adding another condition to the WHERE clause. Because of the.

  3. This tutorial shows you how to use the PostgreSQL UPDATE join syntax to update data in a table based on values in another table.

  4. I have a SQL query where I am trying to update a column in a table from data in another table. This works fine when I try to update all the records in the first table;.

  5. When updating rows based off of a JOIN with another table using a FROM clause, a target row may join against many rows in the FROM relation. When this.

  6. Note The SalesPersonID generated for your table's rows may be different than. to show you how to update's column values based on a match to another table.

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