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I mentioned that the Balance Date field in the Balance History table will determine which record will provide the balance for that Acct No. Have successfully updated records in one table from another using the balance in the latest dated record. No problem executing this SQL using the copy-and-paste-the-text method, but were you saying that this SQL statement could be executed with a macro? The Balance History is not what bothers me (although I have never heard a GOOD reason). Also there are too many things which can go wrong with the approach taken. [closed] How do I create a table (postgresql) as select * from an odb table?

I.e., every Acct No record in the Accounts table will get updated from the Balance History table with its most recent Balance. This is a bit more complex SQL statement using MAX to find date. There are much better ways and means of getting balances. Be aware this was transcribed to your field names and may not be perfect.

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Create table table_1(id number, code varchar2(20));insert into table_1 values(1,'First Row');insert into table_1 values(2, 'Rows to be updated'); Create table table_2(id number, code varchar2(20));insert into table_2 values(2,'Second Row'); After above statements let's look at the data on the table.

In order to apply method 03 you need a primary or unique key column in the source table i.e in the table from where we are fetching data for update.

Same result using a join in a SELECT statement: SELECT "Accounts".*, B."Balance" FROM "Accounts" LEFT JOIN (SELECT "Acct No", "Balance" FROM "Balance History", (SELECT "Acct No", MAX("Balance Date") SELDATE FROM "Balance History" GROUP BY "Acct No") A WHERE "Balance History"."Acct No" = A."Acct No" AND "Balance History"."Balance Date" = A. I understand your advice against keeping balances this way, but you can rest assured that we have reasons for maintaining a history of the account balances.

SELDATE) B ON "Accounts"."Acct No" = B."Acct No" Thanks, Ratslinger for your quick response! I don't see, though, how this statement finds the most RECENT record to use to update the Accounts table. That's why I created a separate table to keep them in. I've posted a number of examples of this - here is one. You can basically do that with an SQL select - almost the one I presented. [closed] JRE problems with Mac Create data grid in dialog function to set a selected row in a listbox Base: alternating row color Base Subform Cascading Listbox Refresh Search functionality in one Sub Form is there something like quickbooks in libre office?

Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.

The Balance History table has a Balance Date field that can be checked to determine which record for a given Acct No has the most recent Balance.

The two tables (Accounts and Balance History) are joined by the Acct No field. Thanks in advance, Base Noob Hello @Base Noob It is not typical to duplicate information in a relational database.

I don't think i can use the merge statement here since there are more than 1 condition that has to be met for the target table to be updated.

The way i understand it external tables don't have primary keys.

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