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From Mysql Tutorial
Daily SQL scripts in GreenPlum
--1. Specify the total number of days in the month SELECT EXTRACT(DAY FROM CAST('2017-08-01' AS DATE...
How to optimize MYSQL database...
An optimization case for high iowait of a database server 1. Development feedback is that SQL in a c...
What are the disadvantages of ...
A clustered index is not a separate index type, but a data storage method (not a data structure, but...
Database jdbc encapsulation
After several days of hard work, I finally got it done. This class can be used without having to wor...
From JS Tutorial
Summary of common Js methods
1. StringchatAt() //Returns the character at the specified position, the first position is 0. (strin...
From CSS Tutorial
CSS method to implement single...
Let’s take a look at the renderings first, as follows: Code implementation: //Single-line{ width:200...
What are the data types in SQL...
The five data types in SQL: character, text, numeric, logical and date. Briefly describe the five da...
From PHP Tutorial
How to process emoji expressio...
Usage scenario: PHP serves as the server to receive the interface data of the APP. Due to the format...
How to create millisecond time...
How to generate QR code using ...
First, download phpqrcode and extract it to the project ThinkPHP\Library\Vendor directory. Index_ind...
