Ms sql updating one table from another ashley green and jackson dating

The staging instance tables looks exactly like the main tables other than a timestamp and an update_type column are added. I need to update 1 column (number) with a column from another table (around 350,000 records) based on a join value in the 2 tables. Can you think of a good way to do this in as little time as possible? you do realize your update sets a.mid_table_id to either: a) itself (you selected a.mid_table_id again) b) null if nothing exists in b probably *not* what you meant?

The records must be processed in order so that for instance, if a record is updated, deleted, inserted, then updated again (not likely, but it *could* happen) those operations should happen in the correct order. In the first table (the 5,000,000 record table) all the records will be updated. (I'll be happy with anything under 20 minutes) Thanks in advance. I'll assume you *meant* b.mid_table_id as long as that column is not indexed, this won't take very long at all.

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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. 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.

If the user has update permission on table A, but only has select permission on table B, they cannot update via the first example. I tried the MERGE command and it is 10 fold fast, however i have few questions. " c)if i have a composite key then "---where a.key1=b.key1 and a.key2=b.key2 and----) am i right for both insert/update by given ur advice? I am getting current year data first into above table after I am trying to update previous year amount.

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.

Hi Tom, I have a huge table similar to the following: eno ename dno sal mgr --------------------------------- 101 A 1 100 102 B 1 200 103 C 1 300 104 D 2 100 105 E 2 200 --------------------------------- Here I want to update the 'mgr' column with 'eno' value having largest 'sal' for each dno. ELIGIBILITY_KEY FROM STG_F_ELIGIBILITY_TRY B, stg_claim_try a WHERE A. your update speed will necessarily be gated by the performance of those queries... ELIGIBILITY_KEY B_ELIG_KEY FROM STG_F_ELIGIBILITY_TRY B, TMP_STG_CLAIM_TRY a WHERE A. PRIMARY KEY ) on commit delete rows; once in your database, then to update: insert into that gtt the job of A and B as above (add client_id to the select list) and the update the join of the gtt to the A table. DATE_SERVICE FROM STG_CLAIM_TRY A, STG_F_ELIGIBILITY_TRY B WHERE A. updating millions of rows is a couple minute process if o column is not indexed o you are not contending for the data updating millions of rows is a couple (hour|day|week|month|year) process potentially otherwise.