I put a primary key on B(id) because if there is NO SUCH constraint -- the update is totally ambigous -- if there is more then 1 value of B1 in B for a given ID -- we cannot tell what row in B should be used to update the row in A. 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. 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..action_button.action_button:active.action_button:hover.action_button:focus,.action_button:hover.action_button:focus .count,.action_button:hover .count.action_button:focus .count:before,.action_button:hover .count:bullet. I match these to a file to update any card numbers to the account number, so that I am only working with account numbers.I created a view linking the table to the account/card database to return the Table ID and the related account number, and now I need to update those records where the ID matches with the Account Number.UPDATE table_a SET column_a_1 = (SELECT table_b.column_b_1 FROM table_b WHERE table_b.user_name = table_a.user_name ) , column_a_2 = (SELECT table_b.column_b_2 FROM table_b WHERE table_b.user_name = table_a.user_name ) WHERE EXISTS ( SELECT * FROM table_b WHERE table_b.user_name = table_a.user_name ) UPDATE in sqlite3 does not support a FROM clause, which makes this a little more work than in other RDBMS.If performance is not satisfactory, another option might be to build up new rows for table_a using a select and join with table_a into a temporary table.= t1.original System Name ) In order to get accurate solutions, could you please provide a few rows of sample data before and after the update (also include at least one row that you do not want updated).Solving word problems is fun, but it leads to a lot of wasted effort [email protected] Bertrand - sorry about that. Some of my questions get wordy so I try to be specific as possible. You specifically have helped me a couple of times in the [email protected] Bertrand - I wasn't sure how to provide the sample data.
You should have indexes on tobeupdated.value and original.value EDIT: we can also simplify the query 10,000 ), so I took your and noodl's advice about the indexes and the whole query now finishes in under a second. Thanks so much for your help; I've learnt a lot!
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I have two tables, with a same column named user_name, saying table_a, table_b.
I want to, copy from table_b, column_b_1, column_b2, to table_b1, column_a_1, column_a_2, respectively, where the user_name is the same, how to do it in sql statement?