How do you choose appropriate data types for columns, and why does it matter?

Problem Statement

Explanation

Pick types that reflect domain rules and size. Use integers for ids, proper date or timestamp types for time, and numeric with scale for money. Narrow types reduce storage, improve cache usage, and speed scans and joins. Consistent types across join keys prevent implicit casts that block index use. Document units and time zones to avoid logic bugs later.

Code Solution

SolutionRead Only

CREATE TABLE payments(
  id BIGINT PRIMARY KEY,
  amount NUMERIC(12,2) NOT NULL,
  paid_at TIMESTAMP NOT NULL
);

Practice Sets

This question appears in the following practice sets:

SQL Core Fundamentals

Next Question

Master Interviews
Anywhere, Anytime

How do you choose appropriate data types for columns, and why does it matter?

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

How do you choose appropriate data types for columns, and why does it matter?

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