How to use instr function in oracle

The instr function in oracle is used to find the position of a string in another string. The basic syntax of the INSTR function is "INSTR(string1, string2, start_position, occurrence)".

In Oracle database, the INSTR function is used to find the position of a string in another string. The basic syntax of the INSTR function is as follows:

INSTR(string1, string2, start_position, occurrence)

Where:

string1 is the string to be searched

string2 is the substring to be found

start_position is the position where the search starts, the default is 1

occurrence is the number of occurrences of the substring to be found in the main string, the default is 1

For example, suppose we There is a table employees, in which a field full_name stores the full name of the employee. We want to find employees that contain "Smith". We can use the INSTR function to achieve this:

SELECT full_name
FROM employees
WHERE INSTR(full_name, 'Smith') > 0;

This will return all employees whose full_name contains "Smith".

In addition, the INSTR function can also be used to find the position of a specific character in a string, for example:

SELECT INSTR('Hello, World', ',') AS position
FROM dual;

This will return the position of the comma in the string "Hello, World".

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