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If you want to update specific rows (ie where the IDs match) you probably want to do a coordinated subquery. However, since you are using Oracle, it might be easier to create a materialized view for your query table and let Oracle's transaction mechanism handle the details.
29 lis 2012 · The derived table, alias b, is used to generated the sequence via the ROW_NUMBER () function together with the primary key column (s). For each row where the column interface-id is NULL, this will generate a row with a unique sequence value together with the primary key value.
Subquery Method. The first option is to do an update of the DEST_TAB table using a subquery to pull the correct data from the SOURCE_TAB table. Notice the EXISTS predicate to exclude rows from the DEST_TAB table with no matching row in the SOURCE_TAB table.
6 gru 2017 · Using a subquery in an UPDATE statement can be a good way to improve the maintainability of your queries. It can also reduce the number of steps required to update your data by compressing two or more queries into a single query.
21 maj 2012 · If you are happy with a number starting from 1 you can use row_number(). update T set cn = rn from ( select cn, row_number() over(order by (select 1)) as rn from TableX ) T
30 lip 2023 · you'd have to use a gtt - flow the results of select ssn, max (pants) max_pants from test2 group by ssn; into a gtt with a primary key on ssn and then update the join update (select pants, max_pants from test, gtt where test.ssn = gtt.ssn and test.pants > to_date ( .... ) ) set pants = max_pants;
24 wrz 2013 · merge into tbl_reporting rep using (select distinct tmp.cmd_key, tmp.reporting_key, tmp.issuer_id, tmp.issuer_name from tmp_reporting tmp where tmp.cmd_key = v_cmd_key) comp on (rep.cmd_key = comp.cmd_key and rep.reporting_key = comp.reporting_key) when matched then update set issuer_id = comp.issuer_id, issuer_name = comp.issuer_name;
