SQL substring函数的相关内容

阿里云文档 2024-10-11

日志服务SQL函数支持分类模型

分类判别机器学习模型可以用于在线识别或者判别系统对象的分类，比如识别每一个用户的请求是否为攻击性的请求。也可以用于识别因素之间的关联关系。本文介绍分类判别分析函数的基本语法和示例。

阿里云文档 2024-09-20

SQL与函数参考

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文章 2023-12-23 来自：开发者社区

PostgreSQL【SQL 01】根据条件更新字段值或追加信息STRPOS(string, substring)函数使用及LIKE函数对比

1.需求说明项目中有这样一个需求，根据条件标记数据，需要完成的内容如下：对符合条件的数据进行标记；无值则使用标记值；有值则判断是否包含当前标记，包含则不处理，不包含则追加。2.SQL编程话不多说，上SQL：UPDATE targetTableName SET targetField = CASE WHEN targetField IS NULL THEN #{ targetVa...

阿里云文档 2023-11-08

SQL分析预置的函数类型及其使用相关说明,包括日期与时间函数、数学函数、窗口函数、聚合函数和字符串函数,以及除上述函数之外的支持其他业务场景的函数_物联网平台(IoT)

SQL分析自身预置了诸多函数，可以满足大部分业务场景的数据处理需求。本文为您介绍SQL分析提供的函数类型及函数使用相关说明。

阿里云文档 2023-08-31

这是一篇关于SQL分析提供的常见其他函数的文档

SQL分析提供了开发过程中常见的其他函数，您可以根据实际需要选择合适的函数。本文为您提供SQL分析支持的CAST、DECODE、LEAST等函数的命令格式、参数说明及示例。

文章 2023-08-28 来自：开发者社区

sql中的substring()、to_char()、extract()、concat()等函数

ERROR: function pg_catalog.substring(timestamp without time zone, integer, integer) does not existLINE 1: SELECT u.username,l.description,l.ip,SUBSTRING(l.createdate,…^HINT: No function matches the g....

文章 2023-01-11 来自：开发者社区

【Sql Server】基础之IF ELSE的使用，以及len和substring、convert函数的使用

作者：小5聊基础简介：一只喜欢全栈方向的程序员，欢迎咨询，尽绵薄之力答疑解惑编程原则：Write Less Do More1、 len函数select len('美人鱼最怕遇到谁？')*0.32、convert函数默认情况下，是不会四舍五入的select convert(int,len('美人鱼最怕遇到谁？')*0.3)3、substring函数select '%'+substring('美人鱼....

文章 2022-02-15 来自：开发者社区

Sql Server substring(expression, start, length)函数

Syntax for SUBSTRING: SUBSTRING(expression, start, length)expression 字符串、二进制字符串、文本、图像、列或包含列的表达式。请勿使用包含聚合函数的表达式。 start 整数或可以隐式转换为int 的表达式，指定子字符串的...

问答 2021-09-30 来自：开发者社区

如何理解SQL SUBSTRING函数？

SQL SUBSTRING函数

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更新时间 2024-07-10 20:52:18

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