Database updating sort order


14-Aug-2020 10:41

How can I achieve the above Thanks Sandra I am trying to do the following: EXEC SQL UPDATE MY TABLE SET COL1 = :new Value WHERE COL1 = 0 AND ROWNUM = 1 ORDER BY COL2; (index on COL1, COL2) Pro*C does not process the "ORDER BY" statement.How can I achieve the above Thanks Sandra "order by" is not valid in an update command.That row can be any row within your table - due to the random retreival by Oracle (will probably be the first physical row in the table, most of the time).With that - returning only one row - why request the min(col2) - since you only have one row ?I need to re-sort the way the strings are displayed in the client so that they are alphabetical ( The order can be changed in the client and that is the official method but it's such a clunky method that it would literally take days and thousands of mouse-clicks to do this. To do this in SQL I need to sort the whole table on column E and then sort column F ascending and then UPDATE the whole table.So far as I can see MS SQL does not allow an UPDATE including an ORDER BY and I'm struggling to find a coherent way to do this.Could I do something like this: UPDATE MY_TABLE SET col1 = :new Value WHERE col2 = (SELECT MIN(col2) FROM MY_TABLE WHERE ROWNUM = 1 AND col1 = 0); If this is OK, I was wondering what are the performance implications of moving the "WHERE" clause to the outer update statement (index is on col2 as well), i.e.: UPDATE MY_TABLE SET col1 = :new Value WHERE col1 = 0 AND col2 = (SELECT MIN(col2) FROM MY_TABLE WHERE ROWNUM = 1); Thanks Sandra It appears that what you want to do is to update the row having the lowest value for col2 where col1=0.

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Furthermore, if you don't specify an 'order by clause' the rows can be in any order.

Could I do something like this: UPDATE MY_TABLE SET col1 = :new Value WHERE col2 = (SELECT MIN(col2) FROM MY_TABLE WHERE ROWNUM = 1 AND col1 = 0); If this is OK, I was wondering what are the performance implications of moving the "WHERE" clause to the outer update statement (index is on col2 as well), i.e.: UPDATE MY_TABLE SET col1 = :new Value WHERE col1 = 0 AND col2 = (SELECT MIN(col2) FROM MY_TABLE WHERE ROWNUM = 1); Thanks Sandra You need the "where col1 = 0" both places.

If they aren't really duplicate rows, then use the other columns that aren't identical to correctly sort out the ONE row you really want.

(then get a proper primary key created on that table ASAP) But if you really must do something like this, what's wrong with a little PL/SQL block?* jquery.0.0.1 - https://github.com/yckart/jquery.* Scroll smooth to any element in your DOM.