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Delete with Join in MySQL
...ect_id = posts.project_id AND projects.client_id = :client_id;
BTW, with mysql using joins is almost always a way faster than subqueries...
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How to change MySQL column definition?
I have a mySQL table called test:
3 Answers
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Creation timestamp and last update timestamp with Hibernate and MySQL
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I would do this using a MySQL trigger so that even if the full entity is not saved or is modified by any external application or manual query, it'll still update these fields.
– Webnet
Jul 25 '13 at 12:09
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新手程序员应该知道的7件事 - 创意 - 清泛网 - 专注C/C++及内核技术
...。掌握类似于find、comm、diff、vi/vim、sed、awk等工具。知道如何用命令行来查找文件等等，都可以在你写脚本的时候为你减负。”
Bull，是一位先用微软工具，然后逐渐转移到Linux的程序员，对此表示赞同：“了解命令行的来龙去...
How to move columns in a MySQL table?
Currently I am having the following MySQL table: Employees (empID, empName, department);
4 Answers
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mysql create user if not exists
I have a query to check mysql users list for create new user.
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Unique constraint that allows empty values in MySQL
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Yes, you can do this. See the MySQL reference (version 5.5).
A UNIQUE index creates a constraint such that all values in the index must be distinct. An error occurs if you try to add a new row with a key value that matches an existing row. For all eng...
MySQL/SQL: Group by date only on a Datetime column
...son. I would expect it to fail anywhere else as well. Can you confirm that MySQL actually handles this query?
– Tomalak
Dec 14 '08 at 15:56
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MySQL convert date string to Unix timestamp
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You will certainly have to use both STR_TO_DATE to convert your date to a MySQL standard date format, and UNIX_TIMESTAMP to get the timestamp from it.
Given the format of your date, something like
UNIX_TIMESTAMP(STR_TO_DATE(Sales.SalesDate, '%M %e %Y %h:%i%p'))
Will gives you a valid timestam...
Sibling package imports
...ern on a regular basis with
# Ugly hack to allow absolute import from the root folder
# whatever its name is. Please forgive the heresy.
if __name__ == "__main__" and __package__ is None:
from sys import path
from os.path import dirname as dir
path.append(dir(path[0]))
__package__ ...