Sql updating a table from another table
Sql updating a table from another table - arab dating powered by azdg ru
The query would in fact execute without any error messages since the correlated subquery in SET clause returns EXACTLY one row for each row in B and the where clause executes without error. Lets say you have a table A ( id int, a1 varchar2(25) ) and a table B ( id int PRIMARY KEY, b1 varchar2(25) ). REGISTRATION where BIN NOT IN (select BIN from VIS. 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. d) I don't program forms -- you can try otn.-Thank u very much for ur nice reply. 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.
It is best to use the above update of a JOIN if possible (optimizer has best chance of getting a good plan). 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? I this updation I want to find the equalent date/day in previous year corresponding to current year date and update the amount.
It will need the primary key constraint on B though, if you do not have one BUT is unique, you can: [email protected] 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. " 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? For this I am using another table to find previous year dates for current year dates.
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. But I am not able to identify the correct record to update. Thanks hi tom , desc child_table ------------------- child_id number ; child_birth_date date; child_20_flag number(1) ; where the child_20_flag should indicate if the child reach 20 years old or not.
Oracle will return ORA-01031 (insufficient privileges). Hi Tom, I have a related question for an UPDATE - that takes unexpected long time. You said to use Oracle9I Merge statement when inserting or updating the data from a stagging table to history table. now , what is the best way to handle it automaticlly ? they are derived columns and should not be stored -- especially something like "20 years old flag" as that can change at any second.
This may seem like a simple question: Update Column a1 in Table A with all data in Column b1 in Table B. 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. 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?
But I am trapped by the method that without using cursor to achieve it. --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 ... 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.
There are one column in each table, call id, to link them. end loop End; It's working but taking a huge time/sometimes hang the computer. 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....Using cursor is ok, but it brings with a un-toleratable speed when operating on a large table. 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. Now, you "two step" it: insert into gtt select b.id, count(*) cnt from tabb b, taba a where = and a.cycle = b.cycle and b.site_id = 44 and b.rel_cd in ( 'code1', 'code2', 'code3' ) and b.groupid = '123' and is null group by / that gets all of the id/cnts for only the rows of interest.Even the idea create a temporary table holding only primary key and Column b, and then apply cursor to it is slow. 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. Now we can update the join: update ( select a.pop, from taba a, gtt b where = ) set pop = cnt / and thats it. Hi Tom, Im selecting approximately 1 million records from some tables and populating another set of tables.I am think of the way without using cursor, script as below. Every month the client office is to give data(NEW & EDITED) "BY DATE RANGWISE" to the headoffice in CD. Here the source tables have data with leading spaces and the target data should be without spaces.But the 2nd Where clause simply return the message of `more than one row is return', since the id is unpredictable and this create a `many to many' relationship in both tables. Many Thanks, (script) REM* the where-clause of the update cannot work UPDATE table b SET column_b1 = ( SELECT MAX(column_a1) FROM table_a a, table_b b WHERE a.id=GROUP BY a.id) WHERE table_IN (SELECT MIN(id) FROM table_a GROUP BY id); Your example is somewhat confusing -- you ask "update column a1 in table a where data in column b1 in table b" but your update shows you updating column b1 in table B with some data from table a. 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 code insert into VISTEMP. I plan to use RTRIM function in the WHERE clause to get specific set records and then after fetching, Ill insert with a RTRIM on each column.Additionally -- given the way the where and set clauses are CODED in the above -- it would succeed. 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---- from VIS. Thank u very much for ur kind & very helpful reply. 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.