Mysql updating multiple rows
Try searching for similar questions Browse our recent questions Browse our popular tags If you feel something is missing that should be here, contact us.
Second, the SET clause specifies which column that you want to modify and the new values.
Ideal when writing a script is just too much effort.
(This is because the order in which the rows are updated determines which rows are ignored.) With this change, such statements produce a warning in the log when using statement-based mode and are logged using the row-based format when using mode.
(Bug #11758262, Bug #50439) See Section 184.108.40.206, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.
UPDATE tbl_name SET fld2 = CASE fld1WHEN val1 THEN data1WHEN val2 THEN data2ELSE fld2 ENDThe note is: do not forget ELSE.
If you do not use it, all rows that are outside the range of your updated values will be set to blank!
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.
I had a problem - a had to update a column "rate" but if the existince or new value is greater then 5 this "5" will be finally value in field.
If you wish to use an increment based on subset of a table you may combine UPDATE with Variables:e.g.
A table that contains entries of different categories, in which an internal order needs to represented ( lets say a table with busstops on different routes).
So, I do it in one "magick" query ;)Here an example:"3" is a some value, from form or somethingupdate item set rate = case when round((rate 3)/2) You sometimes run into the problem that you want to replace a substring occuring in a column with a different string, without touching the rest of the string.
The solution is surprisingly simple, thanks to My SQL: UPDATE xoops_bb_posts_text SET post_text=( REPLACE (post_text, 'morphix.sourceforge.net', ' the string function REPLACE, all items in the post_text column with 'morphix.sourceforge.net' get this substring replaced by '
[I have posted this in the Flow Control Functions page last year but I still see people asking how to update multiple rows.