The INSTR() function returns the position of the first occurrence of a string 

in another string.

This function performs a case-insensitive search.

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// Syntax

INSTR(string1, string2)

// Parameter Values

string1:    Required. The string that will be searched

string2:    Required. The string to search for in string1. 

            If string2 is not found, this function returns 0.

// Example 1

Search for "COM" in string "W3Schools.com", and return position:

// Query :

SELECT INSTR("W3Schools.com", "COM") AS MatchPosition;

// Example

Search for "a" in CustomerName column, and return position:

// Query :

SELECT INSTR(CustomerName, "a") FROM Customers;