search
HomeDatabaseMysql Tutorialsql中CONVERT日期时间格式化

在mysql用来对字符型的时间日期格式化我们常用CONVERT()函数来操作,下面我来给各位朋友详细介绍CONVERT()函数的使用方法,大家可参考。

格式:
CONVERT(data_type,expression[,style])

说明:
此样式一般在时间类型(datetime,smalldatetime)与字符串类型(nchar,nvarchar,char,varchar)
相互转换的时候才用到.

例子:

 代码如下 复制代码
SELECT CONVERT(varchar(30),getdate(),101) now

结果为:

now

|09/15/2001

 代码如下 复制代码

Select CONVERT(varchar(100), GETDATE(), 0)  --05 16 2006 10:57AM
Select CONVERT(varchar(100), GETDATE(), 1)  --05/16/06
Select CONVERT(varchar(100), GETDATE(), 2)  --06.05.16
Select CONVERT(varchar(100), GETDATE(), 3)  --16/05/06
Select CONVERT(varchar(100), GETDATE(), 4)  --16.05.06
Select CONVERT(varchar(100), GETDATE(), 5)  --16-05-06
Select CONVERT(varchar(100), GETDATE(), 6)  --16 05 06
Select CONVERT(varchar(100), GETDATE(), 7)  --05 16, 06
Select CONVERT(varchar(100), GETDATE(), 8)  --10:57:46
Select CONVERT(varchar(100), GETDATE(), 9)  --05 16 2006 10:57:46:827AM
Select CONVERT(varchar(100), GETDATE(), 10)  --05-16-06
Select CONVERT(varchar(100), GETDATE(), 11)  --06/05/16
Select CONVERT(varchar(100), GETDATE(), 12)  --060516
Select CONVERT(varchar(100), GETDATE(), 13)  --16 05 2006 10:57:46:937
Select CONVERT(varchar(100), GETDATE(), 14)  --10:57:46:967


style数字在转换时间时的含义如下:

Style(2位表示年份) Style(4位表示年份) 输入输出格式
0 100 mon dd yyyy hh:miAM(或PM)
1 101 mm/dd/yyyy
2 102 yyyy-mm-dd
3 103 dd/mm/yyyy
4 104 dd-mm-yyyy
5 105 dd-mm-yyyy
6 106 dd mon yyyy
7 107 mon dd,yyyy
8 108 hh:mm:ss
9 109 mon dd yyyy hh:mi:ss:mmmmAM(或PM)
10 110 mm-dd-yy
11 111 yy/mm/dd
12 112 yymmdd
13 113 dd mon yyyy hh:mi:ss:mmm(24小时制)
14 114 hh:mi:ss:mmm(24小时制)
20 120 yyyy-mm-dd hh:mi:ss(24小时制)
21 121 yyyy-mm-dd hh:mi:ss:mmm(24小时制)

 

 

 

 

 

 

 

 

 

 

 

 

注意了convert与cast的区别了,这里简单说明一下

convert一般用于值,小数之间转换;
cast一般用于小数转数值和字符型

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
MySQL String Types: Storage, Performance, and Best PracticesMySQL String Types: Storage, Performance, and Best PracticesMay 10, 2025 am 12:02 AM

MySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,

Understanding MySQL String Types: VARCHAR, TEXT, CHAR, and MoreUnderstanding MySQL String Types: VARCHAR, TEXT, CHAR, and MoreMay 10, 2025 am 12:02 AM

MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

What are the String Data Types in MySQL?What are the String Data Types in MySQL?May 10, 2025 am 12:01 AM

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

How to Grant Permissions to New MySQL UsersHow to Grant Permissions to New MySQL UsersMay 09, 2025 am 12:16 AM

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

How to Add Users in MySQL: A Step-by-Step GuideHow to Add Users in MySQL: A Step-by-Step GuideMay 09, 2025 am 12:14 AM

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

MySQL: Adding a new user with complex permissionsMySQL: Adding a new user with complex permissionsMay 09, 2025 am 12:09 AM

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

MySQL: String Data Types and CollationsMySQL: String Data Types and CollationsMay 09, 2025 am 12:08 AM

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

MySQL: What length should I use for VARCHARs?MySQL: What length should I use for VARCHARs?May 09, 2025 am 12:06 AM

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software