SUBSTRING in Oracle - Examples & AI Generator

The SUBSTRING function in Oracle is a powerful way to extract parts of a string, but the exact syntax often trips up even seasoned SQL developers. Oracle uses SUBSTR (not SUBSTRING) and its parameter order and indexing differ from other databases. Rather than memorizing Oracle-specific rules, AI2sql lets you generate correct SUBSTRING queries in 10 seconds—no coding required. Whether you work in data analysis or migrate between databases, AI2sql solves the syntax puzzle instantly, letting you focus on results.

SUBSTRING Syntax in Oracle

Oracle SUBSTRING (SUBSTR) Function

Unlike SQL Server or MySQL, Oracle uses SUBSTR:

SUBSTR(string, start_position [, length])

• string: The input text or column name.

• start_position: Where to begin extracting (1-based index).

• length (optional): How many characters to return.

Note: Omitting length returns the substring to the end of the string.

SUBSTRING Examples You Can Generate Instantly

• Example 1 — Extract first 3 letters of customer name:

  SELECT SUBSTR(customer_name, 1, 3) AS initials FROM customers;

• Example 2 — Get area code from phone numbers in orders:

  SELECT SUBSTR(phone_number, 1, 3) AS area_code FROM orders;

• Example 3 — Last 4 digits of product codes:

  SELECT SUBSTR(product_code, -4) AS last_digits FROM products;

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FAQ: SUBSTRING in Oracle

• Q: Is SUBSTRING the same as SUBSTR in Oracle?
  A: Yes, Oracle uses the function name SUBSTR instead of SUBSTRING, with similar functionality.

• Q: What is the starting index for SUBSTR in Oracle?
  A: Oracle uses 1-based indexing (the first character is at position 1).

• Q: Can I use negative numbers in SUBSTR?
  A: Yes. A negative start_position counts from the end of the string.

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