【sql】CHARINDEX

  语法:CHARINDEX ( expressionToFind ,expressionToSearch [ , start_location ] )

  参数:

  1)expressionToFind

expression that contains the sequence to be found.‘ data-guid="31322e138e1f1d142d5ca96d75a5ff74">  包含要查找的序列的字符表达式。 

expressionToFind is limited to 8000 characters.‘ data-guid="899380d9ea95b67c4092a730c1a0cee0">expressionToFind 最多包含 8000 个字符。

  2)expressionToSearch

  要搜索的字符表达式。

  3)start_location

integer or bigint expression at which the search starts.‘ data-guid="d1a17b9ccae54b7655b14b3efe985bbe">  表示搜索起始位置的 integer 或 bigint 表达式。 start_location is not specified, is a negative number, or is 0, the search starts at the beginning of expressionToSearch.‘ data-guid="2187f677f256c74b1eb14421d824788a">如果未指定 start_location,该参数为负数或 0,则从 expressionToSearch 开头开始搜索。

start_location is not specified, is a negative number, or is 0, the search starts at the beginning of expressionToSearch.‘ data-guid="2187f677f256c74b1eb14421d824788a">  返回值:

start_location is not specified, is a negative number, or is 0, the search starts at the beginning of expressionToSearch.‘ data-guid="2187f677f256c74b1eb14421d824788a">  如果 expressionToSearch 具有 varchar(max)nvarchar(max) 或 varbinary(max) 数据类型,则返回 bigint;否则,返回 int

start_location is not specified, is a negative number, or is 0, the search starts at the beginning of expressionToSearch.‘ data-guid="2187f677f256c74b1eb14421d824788a">  示例一:

start_location is not specified, is a negative number, or is 0, the search starts at the beginning of expressionToSearch.‘ data-guid="2187f677f256c74b1eb14421d824788a">  CustomName包含客户的First Name和Last Name,它们之间被一个空格隔开。我们用CHARINDX函数确定两个名字中间空格的位置。通过这个方法,我们可以分析ContactName列的空格位置,这样可以只显示这个列的last name部分。

select top 5 substring(ContactName,charindex( ,ContactName)+1,len(ContactName)) as [Last Name] from customers

  示例二:

  计算Northwind.dbo.Customer表中Addresses字段中包含单词Road或者它的缩写Rd的记录数,选择语句类似这样:

select count(*) from Northwind.dbo.Customers where CHARINDEX(Rd,Address) > 0 or CHARINDEX(Road,Address)> 1 

  参考资料:http://www.cnblogs.com/smhy8187/articles/930929.html

【sql】CHARINDEX,布布扣,bubuko.com

【sql】CHARINDEX

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