Re: Insert ... select ... On Duplicate Update Question
At 08:23 PM 7/20/2008, Perrin Harkins wrote: On Sun, Jul 20, 2008 at 12:12 AM, mos [EMAIL PROTECTED] wrote: Is there a way to get Insert ... select ... On Duplicate Update to update the row with the duplicate key? That's what it does. Why can't it do this? What makes you think it can't? - Perrin Perrin, I can't specify all of the columns in a Set statement in the OnDuplicate clause because I don't know what the column names are and there could be 100 columns. I'd like to use something like: insert into Table2 select * from table1 on duplicate key update; but this gives me a syntax error. Error Code : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 So it is looking for an Update expression. I'd like it to update all the columns in the Select statement to the row with the matching key. After all, this is what the statement was trying to do in the first place. I don't see why I have to explicitly specify all of the value assignments in the On Duplicate phrase over again. Mike MySQL 5.0.24 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Insert ... select ... On Duplicate Update Question
On Mon, Jul 21, 2008 at 11:44 AM, mos [EMAIL PROTECTED] wrote: I can't specify all of the columns in a Set statement in the OnDuplicate clause because I don't know what the column names are and there could be 100 columns. Write code to do it. There is no way around specifying the columns. - Perrin -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Insert ... select ... On Duplicate Update Question
At 11:00 AM 7/21/2008, Perrin Harkins wrote: On Mon, Jul 21, 2008 at 11:44 AM, mos [EMAIL PROTECTED] wrote: I can't specify all of the columns in a Set statement in the OnDuplicate clause because I don't know what the column names are and there could be 100 columns. Write code to do it. There is no way around specifying the columns. - Perrin Perrin, Ok thanks. I'll do that. Mike -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Insert ... select ... On Duplicate Update Question
So just use REPLACE instead of INSERT... http://dev.mysql.com/doc/refman/5.0/en/replace.html On Mon, Jul 21, 2008 at 11:44 AM, mos [EMAIL PROTECTED] wrote: At 08:23 PM 7/20/2008, Perrin Harkins wrote: On Sun, Jul 20, 2008 at 12:12 AM, mos [EMAIL PROTECTED] wrote: Is there a way to get Insert ... select ... On Duplicate Update to update the row with the duplicate key? That's what it does. Why can't it do this? What makes you think it can't? - Perrin Perrin, I can't specify all of the columns in a Set statement in the OnDuplicate clause because I don't know what the column names are and there could be 100 columns. I'd like to use something like: insert into Table2 select * from table1 on duplicate key update; but this gives me a syntax error. Error Code : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 So it is looking for an Update expression. I'd like it to update all the columns in the Select statement to the row with the matching key. After all, this is what the statement was trying to do in the first place. I don't see why I have to explicitly specify all of the value assignments in the On Duplicate phrase over again. Mike MySQL 5.0.24 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED] -- Help build our city at http://free-dc.myminicity.com !
Re: Insert ... select ... On Duplicate Update Question
At 12:16 PM 7/21/2008, you wrote: So just use REPLACE instead of INSERT... Sure, but a Replace will delete the existing row and insert the new one which means also maintaining the indexes. This will take much longer than just updating the existing row. Now if there were only a couple of rows then a Replace will work fine (but it would also execute Delete/Insert triggers if I had any). But I have 50 million rows and will need to update maybe 1/2% of those, all of those deletes and inserts will slow things down. Now logically I thought this should work: insert into Table2 select * from table1 on duplicate key update; I thought if MySQL found a duplicate key on the insert, it would automatically update the existing row that it found with the results from table1 if I left out the column expressions in the update clause. But apparently it doesn't work that way. It looks like I have to re-specify each of the column names in Table1 in the Update clause as a column assignment. I thought this was totally necessary because MySQL knew the column assignments for the original insert, why couldn't it pick up where it left off and use the existing row (specified by the duplicate key value it found). Either that or just force me to specify the key value assignment in the Update clause and not the whole column list which could be 100 columns. Mike http://dev.mysql.com/doc/refman/5.0/en/replace.htmlhttp://dev.mysql.com/doc/refman/5.0/en/replace.html On Mon, Jul 21, 2008 at 11:44 AM, mos mailto:[EMAIL PROTECTED][EMAIL PROTECTED] wrote: At 08:23 PM 7/20/2008, Perrin Harkins wrote: On Sun, Jul 20, 2008 at 12:12 AM, mos mailto:[EMAIL PROTECTED][EMAIL PROTECTED] wrote: Is there a way to get Insert ... select ... On Duplicate Update to update the row with the duplicate key? That's what it does. Why can't it do this? What makes you think it can't? - Perrin Perrin, I can't specify all of the columns in a Set statement in the OnDuplicate clause because I don't know what the column names are and there could be 100 columns. I'd like to use something like: insert into Table2 select * from table1 on duplicate key update; but this gives me a syntax error. Error Code : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 So it is looking for an Update expression. I'd like it to update all the columns in the Select statement to the row with the matching key. After all, this is what the statement was trying to do in the first place. I don't see why I have to explicitly specify all of the value assignments in the On Duplicate phrase over again. Mike MySQL 5.0.24 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Insert ... select ... On Duplicate Update Question
On Mon, Jul 21, 2008 at 2:43 PM, mos [EMAIL PROTECTED] wrote: I thought if MySQL found a duplicate key on the insert, it would automatically update the existing row that it found with the results from table1 if I left out the column expressions in the update clause. But apparently it doesn't work that way. It probably could, but it doesn't. With the availability of the information schema, it's easy to look up the columns in a table, so doing this from a program is relatively simple. - Perrin -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Insert ... select ... On Duplicate Update Question
On Sun, Jul 20, 2008 at 12:12 AM, mos [EMAIL PROTECTED] wrote: Is there a way to get Insert ... select ... On Duplicate Update to update the row with the duplicate key? That's what it does. Why can't it do this? What makes you think it can't? - Perrin -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Insert ... select ... On Duplicate Update Question
Is there a way to get Insert ... select ... On Duplicate Update to update the row with the duplicate key? Otherwise I'll have to use Replace which is inefficient because it deletes the old duplicated row and then inserts the new row with the same key. I'd much rather have it update the existing row with the same existing keys, but use the new values in the Select statement. Why can't it do this? It would be much faster. Mike -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
