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For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.

If you set a column to the value it currently has, My SQL notices this and does not update it.

Adam Boyle's commment above was just what I was trying to do, update one table based on a relationship between that table and another.

His example was:update t1,t2 set t1.field=t2.value where t1.this=t2.that; That strikes me as an elegant syntax.

There is a page in the online documentation that explains safe mode entitled 'safe Server Startup Script'.

Suppose you have a table where each row is associated with a certain group (For example, orders are associated with the customers placing them) where each item WITHIN the group has a distinct number (For example, each person my have a sequence of competition results - each person, therefore, has a 1st, 2nd, 3rd... If you would like to renumber items within their group so that each has the same baseline (say 0), here is an example way to proceed: Create TEMPORARY Table Groups (Id INTEGER AUTO_INCREMENT PRIMARY KEY, Name VARCHAR(31), Group Id VARCHAR(31), Val Within Group INTEGER); INSERT INTO Groups VALUES (null, "Davy", "Boy", 2); INSERT INTO Groups VALUES (null, "Mary", "Girl", 2); INSERT INTO Groups VALUES (null, "Bill", "Boy", 5); INSERT INTO Groups VALUES (null, "Jill", "Girl", -3); INSERT INTO Groups VALUES (null, "Fred", "Boy", 3);# Find the lowest value for each group CREATE TEMPORARY TABLE Group Sum AS SELECT Group Id, MIN(Val Within Group) AS base Val FROM Groups GROUP BY Group Id;# create an index so my SQL can efficiently match ALTER TABLE Group Sum ADD UNIQUE (Group Id);# finally, make the baseline adjustment UPDATE Groups LEFT JOIN Group Sum USING (Group Id) SET Val Within Group=Val Within Group-base Val; SELECT * FROM Groups;# 1 Davy Boy 0# 2 Mary Girl 5# 3 Bill Boy 3# 4 Jill Girl 0# 5 Fred Boy 1#Each group ("Boy", "Girl") now has a (lowest) Val Within Group entry of 0.

Notes: That index addition is necessary because on larger tables my SQL would rather die than figure to (internally) index a single column join.

I was not able, using my SQL 4.1.1, to do this as a subquery: UPDATE Groups LEFT JOIN (SELECT Group Id, MIN(Val Within Group) AS base Val FROM Groups GROUP BY Group Id) AS Grp Sum USING (Group Id) SET Val Within Group=Val Within Group-base Val; Csaba Gabor UPDATE Syntax with "on-line" updating value limitations.

updating jsp index-19updating jsp index-71

(This is because the order in which the rows are updated determines which rows are ignored.) Such statements produce a warning in the error log when using statement-based mode and are written to the binary log using the row-based format when using mode.You could then do select @value;in order to see what the value was before you updated it My SQL uses Watcom (Oracle) syntax for UPDATE, so it's possible to write something like:update Table1 t1 join Table2 t2 on t1. When done, you "clear" the semaphore by UPDATE table SET value = 0 WHERE name = 'name' The assumption is that the UPDATE is "atomic" in that no concurrent access by another process can occur between testing and setting the value field.[I have posted this in the Flow Control Functions page last year but I still see people asking how to update multiple rows.Here is the closest I could come up with for doing that on Oracle:update t1 set t1.field=(select value from t2 where t1.this=t2.that) where t1in (select that from t2); That strikes me as convoluted by comparison.order by recno desc limit 1You can also accomplish the same by the following query :update t1 , (select id ,max(recno) as recno from t1 where id=8 group by recno) ttset t1.c1 = ' NO'where tt.id=t1and t1.recno=tt.recno Comments are welcome.




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