如果要截取的字段在字符串中的位置不固定,并且需要截取多个字段,可以使用SUBSTRING函数配合SUBSTRING_INDEX函数(需自定义函数)来实现。下面是一个示例: CREATEFUNCTIONCUSTOM_SUBSTRING_INDEX(inputVARCHAR(255),delimiterVARCHAR(12),indexINT)RETURNSVARCHAR(255)D
8) SUBSTRING() 语法:SUBSTRING(expression, start, length) 描述:返回 SQL Server 中的字符、二进制、文本或图像表达式的一部分。 示例:SELECTSUBSTRING('截取子字符串',, 1) AS Column1, SUBSTRING('截取子字符串',, 4) AS Column1, SUBSTRING('截取子字符串',, 3) AS Column1; 结果: 9) UPPER() ...
❮Previous❮ SQL Server FunctionsNext❯ ExampleGet your own SQL Server Extract 3 characters from a string, starting in position 1: SELECTSUBSTRING('SQL Tutorial',1,3)ASExtractString; Try it Yourself » Definition and Usage The SUBSTRING() function extracts some characters from a string. ...
MYSQL中有系统函数 SUBSTRING_INDEX(), 方便地实现了“一行数据拆分成多行”, SQL SERVER使用都可没这么好了。因此,我在SQL SERVER 2008中仿写了一个自定义函数 f_substring_index() 。 详细代码如下: /* Returns the substring from string str before count occurrences of the delimiter delim. If count is ...
SQL Server教程 - T-SQL-内置函数(Built-in Functions) 更新记录 转载请注明出处: 2022年8月1日 发布。 2022年7月2日 从笔记迁移到博客。 内置函数说明(FUNCTION) Sever 提供了众多功能强大、方便易用的函数。使用这些函数,可以极大地提高数据库的管理。SQL Server中的函数从功能方面主要分为以下几类:字符串...
Applies to: SQL Server Returns part of the value of $sourceString, starting at the position indicated by the value of $startingLoc, and continues for the number of characters indicated by the value of $length. Syntax Copy fn:substring($sourceString as xs:string?, $startingLoc as xs:decim...
The SUBSTRING function returns a portion of a specified character, binary, text, or image expression.
function is used to extract a part of a string. This function is available in both MS SQL Server and MySQL. The MySQL SUBSTRING function provides more functionality than MS SQL Server SUBSTRING function. In MySQL you can also use SUBSTR function which is Synonym for SUBSTRING function ...
在這類大量插入的範例中,可預期會發生 PAGELATCH_EX/PAGELATCH_SH 等候,這是典型的觀察結果。 若要檢查頁面閂鎖等候與樹狀頁面閂鎖等候,請使用 sys.dm_db_index_operational_stats DMV。下表會摘要說明此類閂鎖競爭主要因素的觀察結果:展開表格 因素典型觀察結果 SQL Server 所使用的邏輯 CPU 此類閂鎖競爭主要發生...
Applies to: SQL Server Returns part of the value of $sourceString, starting at the position indicated by the value of $startingLoc, and continues for the number of characters indicated by the value of $length. Syntax Copy fn:substring($sourceString as xs:string?, $startingLoc as xs:decim...