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MySQL GROUP BY extended


MySQL GROUP BY extended

By : menuo bacho
Date : November 21 2020, 04:03 PM
around this issue Your data does not have debits and credits on the same row, so you can do this with a single group by:
code :
SELECT item, count(*) as num_of_custs, SUM(debit) AS debit, SUM(credit) AS credit
FROM t
GROUP BY item, (case when debit is null then 1 else 0 end);


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Forming extended groups of group elements

Forming extended groups of group elements


By : Hai Lam
Date : March 29 2020, 07:55 AM
To fix this issue I'm trying to find sql logic of forming extended groups of group elements.
code :
select distinct `key`
from your_table
where `group` in
(
    select distinct `group`
    from your_table
    where `key` in 
    (
      select `key`
      from your_table
      group by `key`
      having count(*) > 1
    )
)
Extended Module/Group Documentation in external file

Extended Module/Group Documentation in external file


By : Ranjitha R
Date : March 29 2020, 07:55 AM
With these it helps There are many commands existing to include external code examples in your documentation. Have a look at configuration tag EXAMPLE_PATH and the special commands @include and @snippet. You could create a directory called "examples" where you put your example files into and tell doxygen by entering this directory in the EXAMPLE_PATH tag:
code :
EXAMPLE_PATH  = ./examples
/// [Example1]
/// Here some more text to explain the example which is not shown by the \@snippet command.

// But normal comments are shown as a part of the code
for(;;)
{
     doSomething();
}
/// [Example1]

/// [Example2]
while(1)
{
    doSomething2();
}
/// [Example2]
/**
* @defgroup ...
* ...
* @snippet examples_1.c Example1
* ...
* @snippet examples_1.c Example2
*/
/**
* ...
* @include examples_2.c 
* ...
*/
How can we determine the group which initiated SignalR extended method?

How can we determine the group which initiated SignalR extended method?


By : user5916120
Date : March 29 2020, 07:55 AM
it helps some times When sending a group message to clients the server does not send the name of the group the message was sent to. The server selects clients that are members of the group and just sends them the message. If you want to understand the protocol SignalR is using you can find a description I wrote some time ago here.
How to use sed with extended regex: group, condition or and bracket character at the same time?

How to use sed with extended regex: group, condition or and bracket character at the same time?


By : Dan Behlings
Date : March 29 2020, 07:55 AM
Does that help I would like use a sed extended regex (with option -r) for group, condition or and bracket character in avoiding the conflict on the characters ( and ) that are several meanings at the same time here. , Its ambiguous or condition here in this case, do :
code :
echo '(a)ccc(b)' | sed -r 's/.*(\(a\)).*(\(b\)).*/\1 \2/'
Mysql Group Replication--why the maximum number of MySQL servers in a group is 9 server

Mysql Group Replication--why the maximum number of MySQL servers in a group is 9 server


By : Mitesh J
Date : March 29 2020, 07:55 AM
hop of those help? Currently the maximum number of servers is nine and I believe that limit is artificially set low as not to overtax the communications protocol between the servers. There have been requests to increase this number and please put in a feature request at https://bugs.mysql.com with a number you think would be a reasonable number of servers.
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