6 recommended articles about numerical processing

Date and time processing functions Date and time are stored in corresponding data types and special formats so that they can be sorted or filtered quickly and effectively, and to save physical storage space. Typically, applications do not use a format for storing dates and times, so date and time functions are always used to read and manipulate these values. For this reason, date and time functions play an important role in the MySQL language. The following table lists some commonly used date and time processing functions: This is a good time to revisit where to filter data. So far, we have filtered data using where clauses that compare numbers and text, but data often needs to be filtered by date. Filtering by date requires some additional considerations and the use of special MySQL functions. The first thing to note is the date format used by MySQL. Whenever you specify a date, whether inserting or updating a table value or filtering with a where clause, the date must be in the format yyyy-mm-dd. Therefore, September 1, 2005, is given as 2005-09-01. Although other date formats may work, this is the preferred date format because it excludes ambiguities (e.g., 0

1. Examples of date and time processing functions and numerical processing functions (Usage of data processing functions 2)

Introduction: Date and time processing functions Dates and times are stored in corresponding data types and special formats so that they can be sorted or filtered quickly and effectively, and to save physical storage space in general applications. The format used to store dates and times is not used, so date and time functions are always used to read and process these values. For this reason, date and time functions play an important role in the MySQL language.

##2.

User-Agent string uses the == operator in PHP for string comparison

Introduction: User-Agent String: User-Agent string uses the == operator in PHP for string comparison: PHP's = was mentioned in a new article comparing strings in PHP with the == operator recently published on Greg Beaver's blog. The = operator is worth noting when comparing strings. In some cases, PHP will convert numeric data (such as strings containing numbers, etc.) into numerical processing, and the == operator is one of them. When using the == operator to loosely compare two strings, PHP will convert the numeric string into a numeric-like string

3.

Detailed explanation of Python magic methods

Introduction: This article mainly introduces the detailed explanation of Python magic methods. This article explains construction and initialization, magic methods for comparison, magic methods for numerical processing, ordinary arithmetic operators, etc. , Friends in need can refer to

4.

mysql numerical processing function floor and round

Introduction: in mysql When processing numbers, number processing functions will be used. If there is a float type number 2.13, and you want only the integer 2, then you need the following functions floor and round floor: the function only returns the integer part, and discards the decimal part. round: The function rounds, and the part greater than 0.5 is discarded. It is different from floor. The following test is mysql selec

#5.

mysql numerical processing function floor and round_MySQL##.

#Introduction: mysql numerical processing functions floor and round

6. MySQL learning footprint record 09--commonly used text, date , Numerical processing function_MySQL

Introduction: MySQL learning footprint record 09--Commonly used text, date, numerical processing functions

The above is the detailed content of 6 recommended articles about numerical processing. For more information, please follow other related articles on the PHP Chinese website!