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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. )" would return more than one row in general leading to an error).... I have a table with about 5,000,000 records, the table have about 70 columns. I tried all kinds of variations with loading the data into collections and using index-by-varchar tables with no suceess in improving preformance by much.
I put a primary key on B(id) because if there is NO SUCH constraint -- the update is totally ambigous -- if there is more then 1 value of B1 in B for a given ID -- we cannot tell what row in B should be used to update the row in A. dear sir , Acually my problem is huge that that simple , i just try to give u a sample of my problem.i just need to know the best way to update some column value that depends on other columns value in same table (or /and ) in other tables .specially when one of them is a date.i do made a script that run every day at 5 am. March 21, 2004 - pm UTC they are derived columns and should not be stored -- especially something like "20 years old flag" as that can change at any is, and will remain, my answer unless you give me a real world scenario that would demand otherwise (the 20 year old flag should NOT be stored, period) Hi I have three tables, A, B and CA is parent of B and C, A has a composite PK deptno and dname I would like to know if following delete SQLs are equivalent1.------------------------------------------delete bwhere(deptno, dept_name) in (select a.deptno, dname from a, c where a.deptno = c.deptno and a.dname = c.dept_name);2.-----------------------------------------delete bwheredeptno = (select a.deptno from a, c where a.deptno = c.deptno and dname = dpt_name)and dept_name = (select a.dname from a, c where a.deptno = c.deptno and a.dname = c.dpt_name); Are they :-?Check out all our database development sessions at OOW19 This may seem like a simple question: Update Column a1 in Table A with all data in Column b1 in Table B. The Headoffice is merge the data into their system. For migration data first of all i create another temporary user named VISTEMP then cotinuing this kinds of codeinsert into VISTEMP. Its working very nicely.i will greateful to u forever.i was suffering by this problem for a long i am using the following /insert into VISTEMP. i could envision problems with only a second of granularity on a clock -- you could miss a record or two due to that.c) er? Here the source tables have data with leading spaces and the target data should be without spaces.