Not adding 1, but 2, 3 or 4 when UPDATEing mysql with PHP

Not adding 1, but 2, 3 or 4 when UPDATEing mysql with PHP

By : Jim Kapagiannidis
Date : November 17 2020, 11:55 AM
help you fix your problem I have this table called classes: , I solved this by simply doing something like this:
code :
mysql_query("UPDATE classes SET class_level = 2 WHERE class_level = 1");
mysql_query("UPDATE classes SET class_level = 3 WHERE class_level = 2");
mysql_query("UPDATE classes SET class_level = 4 WHERE class_level = 3");

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PHP/MySQL - updateing 2 tables in one request

PHP/MySQL - updateing 2 tables in one request

By : Aimilios Tsouvelekak
Date : March 29 2020, 07:55 AM
around this issue In MуSQL you can insert records only into one table. At the same time, mysql_query() does not support multiple queries. So you should split your insertion into two requests and execute them one by one.
MySQL: UPDATEing a row with no guaranteed unique field

MySQL: UPDATEing a row with no guaranteed unique field

By : user2092779
Date : March 29 2020, 07:55 AM
Any of those help I am working with an old MySQL table, which serves as a log of sorts. It looks like
code :
UPDATE queries 
SET ... 
WHERE Email = value1 
  AND Query = value2 
  AND NumRecords = value3 
  AND Date = value4 
mysql - UPDATEing row based on other rows

mysql - UPDATEing row based on other rows

By : wayne
Date : March 29 2020, 07:55 AM
hope this fix your issue I'm looking to update certain rows based on specific criteria based on other rows. Lets say the table looks like this: , Sure, you can do it in one query. Using this sample table:
code :
create table duotri (time varchar(100), type int, genre int, doubles int, triples int);
insert duotri values
('2010.06.21 12:00'    ,1        ,1        ,0            ,0),
('2010.06.21 12:00'    ,1        ,2        ,0            ,0),
('2010.06.21 12:00'    ,1        ,1        ,0            ,0),
('2010.06.21 12:00'    ,2        ,3        ,0            ,0),
('2010.06.22 12:00'    ,2        ,2        ,0            ,0),
('2010.06.22 12:00'    ,2        ,3        ,0            ,0),
('2010.06.22 12:00'    ,1        ,1        ,0            ,0);
update duotri t1
inner join (
    select time, type,
     case when count(distinct genre) = 2 then 1 else 0 end doubles,
     case when count(distinct genre) = 3 then 1 else 0 end triples
    from duotri
    group by time, type) t2
   on t1.time=t2.time and t1.type=t2.type
set t1.doubles=t2.doubles, t1.triples = t2.triples;
PHP/MySQL Updateing order

PHP/MySQL Updateing order

By : kin
Date : March 29 2020, 07:55 AM
seems to work fine This will not work as long as "artorder" is the unique key that you use when updating a row. This is because you will run into situations where the artorder is the same in two rows; thus, you no longer have a unique key. Just add a primary key to the table and use that on your UPDATE statements:
code :
ALTER TABLE articles ADD articleId INT(5) NOT NULL,
ADD PRIMARY KEY (articleId) 
Error in Updateing query with PHP in Mysql

Error in Updateing query with PHP in Mysql

By : Robert_J
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You don't need comma at the end of this string $update .= "document_name = '{$path_name}', " ,that is what is causing syntax error
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