mysql Batch delete data sql sentence _mysql Batch delete data sql Statement explanation

1.like And in Batch delete specified records like grammar like Mainly used for fuzzy query sql = "delete from A where field like '%ABC%'" This ca...
2021-01-19 07:20 views 49

mysql trigger delete_MySQL trigger

one , Concept of trigger ​ A trigger is when a table changes (delete,insert,update) One that is automatically executed when MySQL sentence ( Or lo...
2021-01-18 23:47 views 18

vcs Coverage options

vcs The commonly used collection coverage options in are as follows ：1.cm_dir <directory_path_name> This option can set an alternative name o...
2021-01-18 15:00 views 917

Scientists have identified one of the oldest planetary systems in history

Scientists have identified one of the oldest planetary systems ever discovered . The planetary system has a star called TOI-561b Rocky planet , Ar...
2021-01-18 08:55 views 29

GitHub HR supervisor resigns due to dismissal of Jewish employee

According to foreign media TechCrunch report ,GitHub According to an internal survey conducted by , The company made a mistake in firing a Jewish ...
2021-01-18 08:51 views 30

sqrt function

sqrt() Usage of functions , Find the triangle area. I saw the triangle area when I brushed the questions today , It suddenly occurred to me that th...
2021-01-15 23:28 views 21

13 Programming habits

Take a good name, whether it's the package name , Class name or function method and variable , Don't name it casually , Like what foo, bar, a,b,c...
2021-01-15 18:30 views 21

take python Update to the latest version _python Upgrade problem

This paper is recorded in Ubuntu 16.04 Admiral python Upgrade to 3.8 edition , And configured as the system default python3 Process of . s...
2021-01-15 01:27 views 32

2020 year Python Railway 12306 Ticket grabbing artifact

The new year has begun again , Spring Festival also began one after another , But this year is still a special case , I hope you will be safe when...
2021-01-14 16:45 views 47

Currently used python edition _Python How many versions are there ?

Python of 3.0 edition , Often referred to as Python 3000, Or abbreviation Py3k. be relative to Python Previous versions of , This is a big upgrade ...
2021-01-14 04:54 views 19
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