Oracle cursor for updating in oracle

Have you ever had one of those moments where you’ve just completed importing 1.7 million user records from flat files into an normalized set of ATG Personalization tables, plus some custom tables, and you only then realize that the passwords from the old system, while in the compatible md5sum format, are all UPPERCASE, while ATG uses all lowercase hashes? I’m happy to override ATG behavior when I should, but this just felt wrong. I figured the two possible solutions were as follows: The issue with option 1 is that it means overriding the perfectly good out of the box behavior of ATG Profiles for the life of the application due to a set of awkward initial data.Cheers." id="ctl00_m_m_i_ctl00_gr_ctl01_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="2758306" / You need to check new records against existing records for some uniqueness value.If you're already loading it by cursor, adding a simple IF check shouldn't be difficult.It can also looks like this: select id, a, b from tb_target union all select id, a, b from tb_source Then, we've group records by all columns in this view and counting appearance by primary key (i.e.: id): select id, count(1) cnt group by id, a, b In group clause You must specify all columns, which can be updated/insert, and in counting specify only pk fields.SQL, SQL Server, Tutorials, Oracle, PL/SQL, Interview Questions & Answers, Joins, Multiple Choice Questions, Quiz, Stored Procedures, Select, Insert, Update, Delete and other latest topics on SQL, SQL Server and Oracle.Count returns two of possible values: 1 - record exists only in one of table (source or target) - potential case of insert 2 - record exists in both tables and has differend values - definitive case for update.Next step joins prepared view with source table, for exclude records, which exists only in target table: where = and cbn.cnt=1 -- <-cnt=1 - records for update/insert only group by After that, we join result once more with sourcet table, to gets insert/update values select src2.id, src2.a, src2.b, cbn2where src2= cbn2Then part of merge clause, which join our set of data with target table = and = 2 '= 2' means that record will be updating. If cnt=2 the record in target table will be updating, if not (cnt=1) record will be inserting into target table." id="ctl00_m_m_i_ctl00_gr_ctl15_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="2764488" / Let's take look from most nestled statement: /* combine records of both tables */ (select id, count(1) cnt from ( __select * from tb_target __union all __select * from tb_source) group by id, a, b) cbn --specify all columns tb_source - table with records to load tb_target - table with records for update or insert from tb_source Say, we have 3 columns: id, a and b.

oracle cursor for updating in oracle-86

One DML instruction - nothing else: /* trg: target table to update/insert into */ merge into tb_target trg using __/* base query with wanted records */ __(select src2.id, src2.a, src2.b, cbn2__from tb_source src2, ____/* choosing records for update/insert only */ ____(select cbn.id, count(1) cnt ____from ______/* combine records of both tables */ ______(select id, count(1) cnt ______from ( ________select * from tb_target ________union all ________select * from tb_source) ______group by id, a, b) cbn, --specify all columns ______tb_source src ____/* cnt=1 : different rec in source table (or not exists in target) */ ____where = and cbn.cnt=1 ____group by cbn.id) cbn2 __where src2= cbn2.id) fin /* condition for matches: cnt=2/update; cnt=1/insert */ on (= and = 2) when matched then __update set trg.a=fin.a, trg.b=fin.b when not matched then __insert (trg.id,trg.a,trg.b) values (fin.id, fin.a, fin.b)" id="ctl00_m_m_i_ctl00_gr_ctl11_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="2761431" / '...Since you haven't included any kind of table describe, you'll have to come up with the uniqueness check yourself. if i use merge then if i found a match then i would have to update record or else insert would again be the same case.i just want to insert new records and update the existing records only if they have changed..." id="ctl00_m_m_i_ctl00_gr_ctl05_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="2759530" / Hi if i use merge then if i found a match then i would have to update record or else insert would again be the same case.i just want to insert new records and update the existing records only if they have changed... Insert all records to be loaded into a Staging Table. Substract new Staging Table records from existing Target Table records 3.Insert only new records into Target Table" id="ctl00_m_m_i_ctl00_gr_ctl07_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="2760717" / I am not clear how your cursor is generated, but could you: 1.Create a view as union of all records from table 1 and 2.It can also looks like this: select id, a, b from tb_target union all select id, a, b from tb_source Then, we've group records by all columns in this view and counting appearance by primary key (i.e.: id): select id, count(1) cnt group by id, a, b In group clause You must specify all columns, which can be updated/insert, and in counting specify only pk fields.

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