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INDEX(a,b,p,s) Locate the document in the library structure

INDEX(a,b,p,s) is an arithmetic function that determines the position of the substring specified in b within the character string a. a and b are string specifications. Only expressions that have an alphanumeric value are permitted as string specifications.

The parameter p (an expression) is optional. If p is specified (p>=1), it defines the start position for the search for the substring b. If p is not specified, the search is started at position 1.

The parameter s (an expression) is optional. If s is specified, it determines the number of searches for the substring b. If s is not specified, the search is carried out for the first occurrence.

 

Result of the INDEX(a,b,p,s) function

a, b character strings and b not less than s times substring of a

0

a character string and b empty character string

p

a, b, p or s is the NULL value

NULL Value

p or s is special NULL value

Error message

Examples

SQL Tutorial, Structure linkInformation About Character Strings

 

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