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INDEX(a,b,p,s) 

INDEX(a,b,p,s) is an arithmetic function that determines the position of the substring specified in b within the character string a.

The parameter p 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 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 NULL value

NULL value

p or s is special NULL value

Error Message

Example table: customer

The position of the character string ‘er’ is to be determined in all customer surnames.

SELECT name, INDEX(name,'er') position_er FROM customer

NAME

POSITION_ER

Porter

5

DATASOFT

0

Porter

5

Peters

4

Brown

0

Porter

5

Howe

0

Randolph

0

Peters

4

Brown

0

Jackson

0

Adams

0

Griffith

0

TOOLware

0

Brown

0

 

 

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