1. Installmysql
(1) Unzipmysqlpackage and createmysqlUsers and creationmysqldata directory span>
tar zxvf mysql-5.6.43-linux -glibc2.12-x86_64.tar.gz
mv mysql-5.6.43-linux-glibc2
Month: October 2021
Mysql – Counting – Optimization of Each Connection
Results:
I have used three methods:
>Three sub-queries, each adding 1 (my)
>Three subqueries, no connection, use where to filter (SlimsGhost)
>Three connections (Solarflare)
I have us
MySQL – How to SUM Time?
I have a table with date and time values in this format:
Start
1/13/2009 7:00:00 AM
End
1/13/2008 2:57:00 PM
I use the’str to date’ function to convert them Date and
Is it possible to have a whole result set in MySQL?
Is it possible to apply a hash function to the entire result set in mysql.
I know how to hash values in each row of the result set< /p> For example, SELECT md5(‘something’)
But say I
How do I call the “AT command” of the GSM modem in the codeys? Not a standard Send_SMS and E.T.C
I have a gsm-modem and plc, plc sees a modem (I use *.lib and the function block “openPort”), but I don’t understand how to write “in the modem” at command”, such as “ate0”. First, in order to i
[C #] Record synchronization method as asynchronous method
[C#] Rewrite the synchronous method into an asynchronous method
When we encounter the need to spend longer In time programs,
We usually call it asynchronously (such as BeginRead, EndRea
C # save files
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = “Excel spreadsheet (*.xlsx)|* .xlsx”;
sfd.FilterIndex = 1;
sfd.RestoreDirectory = true;
if (sfd.ShowDialog() == DialogResult.OK)
{
Mysql8.0 version installation tutorial
In the past few days, I have been crazy about the configuration of various environments. I have inquired a lot of information. It is a bit of experience. ForMysql installation and solutions to poss
How to pack printf () into a function or macro?
This sounds a bit like an interview question, but it is actually an actual question.
I am using an embedded platform and only provide this The equivalent of these functions:
> printf(
Mysql Design and Development Specification 2
Table of Contents 1. Specification background and purpose 2. Design specification 2.1. Database design 2.1.1. Library name 2.1.2. Table structure 2.1.3. Column data type optimization 2.1.4.