Oracle INSTR Function Explained

There is no INDEXOF function in Oracle database. However, Oracle provides other functions that can achieve similar functionality. Here are a few commonly used functions:

1. Can you provide me with some instructions?
2. FIND(string, substring, [start_position], [occurrence])
3. a piece of string
4. a small part of a larger string
5. beginning position
6. event

Original: 大家好，我叫小明，今年15岁，我来自中国。
Paraphrased: Hello everyone, my name is Xiaoming, I am 15 years old, and I am from China.

SELECT INSTR('Hello World', 'World') FROM dual;
-- 输出：7

1. Finding the position of a pattern within a string using regular expressions.
2. Find the position of a regular expression pattern within a string.
3. a piece of twine
4. design
5. placement
6. something that happens or takes place
7. Option: She decided to come back home.
8. parameter_match

“我必须去购物，因为我需要买一些食物。”

“I have to go shopping because I need to buy some food.”

SELECT REGEXP_INSTR('Hello World', 'Wo..d') FROM dual;
-- 输出：7

1. extract a portion of a string
2. Extract a portion of a string starting from a specified position, with an optional length.
3. Just one selection, please.
4. initial position
5. size

他的钢笔是一支黑色的荧光笔。
His pen is a black highlighter.

SELECT SUBSTR('Hello World', 7) FROM dual;
-- 输出：World

These functions can assist you in achieving the functionality of finding a substring within a string.