例如，某个字段有值：ababccc，有什么办法知道这个第二a 在这个字符串中的位置呀
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第二a位置:
CHARINDEX( 'a ',字段,CHARINDEX( 'a ',字段)+1)
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select CHARINDEX( 'a ', 'ababccc ',CHARINDEX( 'a ', 'ababccc ')+1)
结果
3
但是必须保证至少有一个a，否则会出错
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Syntax
CHARINDEX ( expression1 ,expression2 [ , start_location ] )
Arguments
expression1
Is an expression that contains the sequence of characters to be found. expression1 is an expression of the character string data type category.
expression2
Is an expression, typically a column searched for the specified sequence. expression2 is of the character string data type category.
start_location
Is the character position to start searching for expression1 in expression2. If start_location is not specified, is a negative number, or is zero, the search starts at the beginning of expression2. start_location can be of type bigint.
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select PARSENAME(replace( 'ababccc ', 'a ', '. '), 2) --字符内不能有 '. '
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select CHARINDEX( 'a ', 'drdsaabbbbbccc ',2)+1