Updating multiple columns in mysql
(Bug #11758262, Bug #50439) See Section 126.96.36.199, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.If you access a column from the table to be updated in an expression, assignments are generally evaluated from left to right.
When you want to use the same timestamp in multiple update or insert queries, you need to declare a variable.Here is my example..normal update command would be: // question ID ranges from 1-20 // $questionid == 1, $member_id==1 UPDATE table_Foo Bar SET answer One='$ans1Val', answer Two='$ans2Val', answer Three='$ans3Val' WHERE member_id='$memberid' AND question_id='$questionid'; // $questionid == 2, $member_id==1 UPDATE table_Foo Bar SET answer One='$ans1Val', answer Two='$ans2Val', answer Three='$ans3Val' WHERE member_id='$memberid' AND question_id='$questionid'; ..UPDATE table_Foo Bar SET answer One='yes', answer Two='no', answer Three='yes' WHERE member_id = 1 AND question_id = 1; UPDATE table_Foo Bar SET answer One='no', answer Two='no', answer Three='yes' WHERE member_id = 1 AND question_id = 2; UPDATE table_Foo Bar SET answer One='yes', answer Two='yes', answer Three='no' WHERE member_id = 1 AND question_id = 3; oh, absolutely!!table_member ( member_id, taking Foobar, foobar Completed, foobar Start Time, foobar End Time ) //foobar is actually a "results" table.;) table_foobar ( foobar_id, member_id, question_id, answer One, answer Two, answer Three, answer Four ) //Multiple questions for a single foobar Main survey.Sorry, still learning :) @Ollie Jones wasn't certain this was the issue.
Isrwluke you should separate out user input from your queries. You were probably downvoted because this is one of the first things on the manuals page.
For multiple-table updates, there is no guarantee that assignments are carried out in any particular order. COLUMN2 IS NULLAn outerjoin is performed based on the equijoin condition.
If you set a column to the value it currently has, My SQL notices this and does not update it. Records not matching the equijoin from table2 are marked with null.
If an update on a row would result in a violation of a primary key or unique index, the update on that row is not performed.
It is safe or there is a chance that the columns are update with different time, beacause of the 2 visible calls to now() ?
is the ID as defined by an initial form where the user selects "Edit User".