Updating large tables insiders online dating guide 2016 edition

05-Jul-2017 19:30

Oracle performs the specified update if the condition of the ON clause is true.

That is, you can only update the same row of the target table once in the same MERGE statement.

What's more, we can wrap up the whole transformation process into this one Oracle MERGE command, referencing the external table and the table function in the one command as the source for the MERGED Oracle data.

file,10) full (contracts_file) */ * from contracts_file ))) f on d.contract_id = f.contract_id when matched then update set desc = f.desc, init_val_loc_curr = f.init_val_loc_curr, init_val_adj_amt = f.init_val_adj_amt when not matched then insert values ( f.contract_id, f.desc, f.init_val_loc_curr, f.init_val_adj_amt); In Oracle Database 10g, the MERGE statement has been extended to cover a larger variety of complex and conditional data transformations, allowing faster loading of large volumes of data.

If no rows satisfy the condition, then Oracle inserts the row into the target table based on the corresponding MERGE source row.

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merge_update_clause - The merge_update_clause is used to specify the update column values of the target table.You should use the MERGE statement to select rows from one or more sources for insert or update of one or more tables.