Describe how LIKE works with % and _ wildcards. When should you avoid it?

Problem Statement

Explanation

Percent matches any sequence of characters, including empty. Underscore matches exactly one character. Anchoring at the end, like 'abc%', can use indexes; leading wildcards like '%abc' usually force scans. Use LIKE for simple patterns. For heavy text search or complex rules, prefer full text indexes or regex features to keep queries fast and precise.

Code Solution

SolutionRead Only

SELECT * FROM students WHERE first_name LIKE 'K%';
SELECT * FROM students WHERE first_name LIKE '__K%';

Practice Sets

This question appears in the following practice sets:

SQL Core Fundamentals

Next Question

Master Interviews
Anywhere, Anytime

Describe how LIKE works with % and _ wildcards. When should you avoid it?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews Anywhere, Anytime

Describe how LIKE works with % and _ wildcards. When should you avoid it?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime