Updating columns in oracle

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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.

Given that, we can: [email protected] select * from a 2 / ID A1 ---------- ------------------------- 1 Hello 2 World The following updates are equivalent as well - they do the same thing differently. REGISTRATION); RUN and Computer in BIG Busy mood(Hang). REGISTRATION(BIN, NAME, NAME_ALIAS, COR_GROUP, AUTHOBY, AUTHODATE, CG_NAME, ADD1, ADD2, ADD3, TEL1, FAX1, ADD5, ADD6, ADD7, TEL2, FAX2, ADD9, ADD10, ADD11, TEL3, FAX3, TP_TYPE, TRD_LINC, TRD_FY, TRD_AUTH, IMP_REG, EXP_REG, REG_TYPE, TIN, STATUS, PRE_BIN, DATREG, STAT_CHNG, ACT_CODE, ACT_MULT, ITEM_TYPE, OLD_ACT, APP_CAT, LCODE, ISSUE_DATE, VREG, M_POSI, MFUNC, SFUNC, LAST_USER, LAST_ACCS, TREG, PAY_FREQ, CREG, EREG, OREG, OP_BAL, OP_BAL_DT)select BIN, NAME, NAME_ALIAS,---- from VIS. In update portion i am facing another problem by ur recomended code. INSERT into abc values (RTRIM(col1), RTRIM(col2) .) There is another option where I can use SELECT RTRIM(col1), RTRIM(col2) from xxx where RTRIM(col1) = ‘yyy’ and then directly use insert into target table without RTRIM.

It is best to use the above update of a JOIN if possible (optimizer has best chance of getting a good plan). REGISTRATION where not exists (select null from VIStemp. b)in privious question i told u that i am exporting incremental and edited data by using system date. In my B(big table record-79186) and in S(small table record-12871). Can you please tell me which option performs better if the number of records are in millions. I have a table t1 which is having all orders information.

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.

I am think of the way without using cursor, script as below. I don't understand what's the problem.i am going to give u full overview of my problem. The software is available in different portion of the country for data entry and report generation etc. What about: create global temporary table gtt ( id int primary key, cnt int ) on commit delete rows / you'll add that ONCE, it'll become part of your schema forever....

The performance degrade when T1 has all rows for update. ") committing in for loop == terrible, horrible, really truly BAD idea. Anyway -- my suggestion -- lose the procedural code. COM begin 2 update ( select t1.object_name t1_oname, t2.object_name t2_oname 3 from t1, t2 4 where t1.object_id = t2.object_id ) 5 set t1_oname = t2_oname; 6 7 dbms_output.put_line( 'Updated '

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