3.2 Comparison Functions and Operators 3.3 Logical Operators 3.4 Assignment Operators 4 Control Flow Functions 5 String Function5.1 String Comparison Functions 5.2 Regular Expressions 5.3 Character Set and Collation of Function Results 6 Numeric Functions ...
This chapter describes the built-in functions and operators that are permitted for writing expressions in MySQL. For information about loadable functions and stored functions, seeSection 5.6, “MySQL Server Loadable Functions”, andSection 23.2, “Using Stored Routines”. For the rules describing how...
& Bitwise AND >> Right shift << Left shift ^ Bitwise XOR BIT_COUNT() Return the number of bits that are set | Bitwise OR ~ Bitwise inversion The following list describes available bit functions and operators: | Bitwise OR. ...
MySQL提供的函式非常多,你不用把每一个函式的名称和用法都背起来,就算是为了参加认证考试也一样。这个章节只有介绍「部份」函式,并不是全部,所以你在了解这章讨论的函式以后,需要到MySQL参考手册中的「Chapter 12. Functions and Operators」,进一步认识MySQL还有提供哪一些函式。 2.1 字串函式 字串资料的处理是...
5、Functions and Operators MySQL常用函数和操作符,使用较多 6、Views and Stored Programs 视图、存储过程、函数、触发器、event语法参考 7、Optimization:优化 非常值得细致的看一遍,此篇文档不仅仅用来参考,更多的是用来学习优化知识,算是DBA进阶宝典 8、Partitioning ...
官方文档:MySQL 参考手册 - 14.7 Date and Time Functions;MySQL 参考手册 - 14.8 String Functions and Operators 返回值类型:Item 类(item),用于表示查询任何类型表达式的基类。 语义组中的备选规则如下: ADDDATE 函数 官方文档:MySQL 参考手册 - 14.7 Date and Time Functions 标准语法:ADDDATE(date,INTERVAL ...
date_add(date,intervalexpr type) 返回与所给日期date相差interval时间段的日期interval是间隔类型关键字,expr是一个表达式,这个表达式对应后面的类型,type是间隔类型,共有13种间隔类型。MySQL中的日期间隔类型表达式类型 描述 格式 hour 小时 hh minute 分 mm second 秒 ss year 年 YY month 月 MM day 日 DD ...
mysql在线调试地址:http://sqlfiddle.com/ mysql官方文档:https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html 数学公式在线编辑器:https://editor.codecogs.com/ 以上就是MySQL 常用函数一览的介绍,做此记录,如有帮助,欢迎点赞关注收藏!
11.3.2. Comparison Functions and Operators 11.3.3. Logical Operators 11.4. Control Flow Functions 11.5. String Functions 11.5.1. String Comparison Functions 11.5.2. Regular Expressions 11.6. Numeric Functions and Operators 11.6.1. Arithmetic Operators 11.6.2. Mathematical Functions 11.7. Date and Tim...
A select_expression or where_definition in a SQL statement can consist of any expression using the functions described next. An expression that contains NULL always produces a NULL value unless otherwise indicated in the documentation for the operators and functions involved in the expression. ...