mysql database notes
DQL: query statement 1. Sort query 2. Aggregate function 3. Group query 4. Paging query
constraint Relationship between multiple tables normal form Backup and restore of database DQL: query statement Sort query
Syntax: order by clause
order by sort field 1, sort by 1, sort field 2, sort by 2 Sort by: ...
Posted on Fri, 19 Nov 2021 02:39:08 -0500 by thecard
In Oracle functions or stored procedures, the following syntax is usually used to assign values to variables:
-- Single variable assignment
SELECT [Field 1] INTO [Variable 1] FROM [data sheet] WHERE [query criteria];
-- Multivariable assignment
SELECT [Field 1], [Field 2] INTO [Variable 1], [Variable 2] FROM [data sheet] WHERE [qu ...
Posted on Fri, 19 Nov 2021 01:45:29 -0500 by lead2gold
We may have the following requirements when using MySQL:
Before inserting or updating data into t1 table, the data is automatically verified. The value of m1 column must be between 1 and 10. The verification rules are as follows:
If the value of the m1 column of the inserted record is less than 1, press 1 to insert.If the value of ...
Posted on Wed, 17 Nov 2021 21:05:06 -0500 by sneamia
House List Page
from . import api
from flask import g, current_app, jsonify, request, session
from ihome.utils.response_code import RET
from ihome.models import Area, House, Facility, HouseImage, User, Order
from ihome import db, constants, redis_store
from ihome.utils.commons import login_required
from ihome.utils.image_storage import ...
Posted on Wed, 17 Nov 2021 12:09:18 -0500 by altergothen
Introduction: MSE microservice engine will launch the professional version of service governance, providing out of the box and complete professional microservice governance solutions to help enterprises better realize microservice governance capabilities. If your system can quickly have a complete full link gray-scale capability as described in ...
Posted on Wed, 17 Nov 2021 03:57:10 -0500 by WBSKI
I have 10 years of java development experience and now work in Telecom. I need to learn python and record my learning records. Later, we will continue to share real work experience and projects. Welcome to learn from each other!! Please point out that the article is not rigorous
1. Create a model class
Open models.py of the pay application to ...
Posted on Tue, 16 Nov 2021 20:29:33 -0500 by ethan89
A project in recent work has the requirement to automatically send some information emails to the specified mailbox, so how to use Python to realize the function of automatically sending emails? Next, let's simply say.
Send mail using Python SMTP
SMTP (Simple Mail Transfer Protocol) is the simple mail transfer protocol. In other words, it is ...
Posted on Tue, 16 Nov 2021 06:12:21 -0500 by Wildthrust
mysql partition management and maintenance of operation and maintenance tool
The above two blogs briefly introduce what partitions and sub partitions are. This document mainly introduces partition management
If you have a large amount of data, it is recommended not to try the operation * *. It should be because a large number of operatio ...
Posted on Tue, 16 Nov 2021 03:54:09 -0500 by saint4