Sql Server中REPLACE函数的使用
在sql的使用过程当中,我们偶尔会遇到这样一种情况,就是需要改变数据的存储形式,比如数据库某一张表(Info)当中有一个字段Educational(学历),以前存储的是Json数组,现在由于需求的改变,我需要将数据的存储形式改成Json格式,这样我们就需要对数据进行替
在sql的使用过程当中,我们偶尔会遇到这样一种情况,就是需要改变数据的存储形式,比如数据库某一张表(Info)当中有一个字段Educational(学历),以前存储的是Json数组,现在由于需求的改变,我需要将数据的存储形式改成Json格式,,这样我们就需要对数据进行替换,当数据量太大时,人工操作明显是不可取的,所以作者就找到了sql当中的REPLACE函数,下面分享一下我的个人体会。
REPLACE
用第三个表达式替换第一个字符串表达式中出现的所有第二个给定字符串表达式。
语法
REPLACE ( ''string_replace1'' , ''string_replace2'' , ''string_replace3'' )
参数
''string_replace1''
待搜索的字符串表达式。string_replace1 可以是字符数据或二进制数据。
''string_replace2''
待查找的字符串表达式。string_replace2 可以是字符数据或二进制数据。
''string_replace3''
替换用的字符串表达式。string_replace3 可以是字符数据或二进制数据。
返回类型
如果 string_replace(1、2 或 3)是支持的字符数据类型之一,则返回字符数据。
如果 string_replace(1、2 或 3)是支持的 binary 数据类型之一,则返回二进制数据。
示例
下例用 xxx 替换 abcdefghi 中的字符串 cde.
SELECT REPLACE(''abcdefghicde'',''cde'',''xxx'')GO
下面是结果集:
------------abxxxfghixxx(1 row(s) affected)
那么如何直接对数据进行修改呢?
首页,我们要实现的是对表中存储的数据进行修改,那么一定会有 Update,其次,我们需要把我们的数据进行替换,那么一定会有 REPLACE.
得出的sql语句如下:
update [Info] set [Educational] =(select REPLACE(REPLACE([Educational],'[',''),']',''))
执行以上的Sql语句,就会把表中存储的数据全部从Json数组变为Json字符串了。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



MetaMask (also called Little Fox Wallet in Chinese) is a free and well-received encryption wallet software. Currently, BTCC supports binding to the MetaMask wallet. After binding, you can use the MetaMask wallet to quickly log in, store value, buy coins, etc., and you can also get 20 USDT trial bonus for the first time binding. In the BTCCMetaMask wallet tutorial, we will introduce in detail how to register and use MetaMask, and how to bind and use the Little Fox wallet in BTCC. What is MetaMask wallet? With over 30 million users, MetaMask Little Fox Wallet is one of the most popular cryptocurrency wallets today. It is free to use and can be installed on the network as an extension

Go language provides two dynamic function creation technologies: closure and reflection. closures allow access to variables within the closure scope, and reflection can create new functions using the FuncOf function. These technologies are useful in customizing HTTP routers, implementing highly customizable systems, and building pluggable components.

In C++ function naming, it is crucial to consider parameter order to improve readability, reduce errors, and facilitate refactoring. Common parameter order conventions include: action-object, object-action, semantic meaning, and standard library compliance. The optimal order depends on the purpose of the function, parameter types, potential confusion, and language conventions.

The key to writing efficient and maintainable Java functions is: keep it simple. Use meaningful naming. Handle special situations. Use appropriate visibility.

1. The SUM function is used to sum the numbers in a column or a group of cells, for example: =SUM(A1:J10). 2. The AVERAGE function is used to calculate the average of the numbers in a column or a group of cells, for example: =AVERAGE(A1:A10). 3. COUNT function, used to count the number of numbers or text in a column or a group of cells, for example: =COUNT(A1:A10) 4. IF function, used to make logical judgments based on specified conditions and return the corresponding result.

The advantages of default parameters in C++ functions include simplifying calls, enhancing readability, and avoiding errors. The disadvantages are limited flexibility and naming restrictions. Advantages of variadic parameters include unlimited flexibility and dynamic binding. Disadvantages include greater complexity, implicit type conversions, and difficulty in debugging.

The benefits of functions returning reference types in C++ include: Performance improvements: Passing by reference avoids object copying, thus saving memory and time. Direct modification: The caller can directly modify the returned reference object without reassigning it. Code simplicity: Passing by reference simplifies the code and requires no additional assignment operations.

The difference between custom PHP functions and predefined functions is: Scope: Custom functions are limited to the scope of their definition, while predefined functions are accessible throughout the script. How to define: Custom functions are defined using the function keyword, while predefined functions are defined by the PHP kernel. Parameter passing: Custom functions receive parameters, while predefined functions may not require parameters. Extensibility: Custom functions can be created as needed, while predefined functions are built-in and cannot be modified.
