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N032-E2 Tier 3 · Intermediate · easy ecommerce · Brightlane

Return the string `'2024-06-15 14:30:00'` cast as a timezone-naive timestamp

Part of Date and Time Types in PostgreSQL in SQL

The problem

Brightlane's logging system stores event times as timezone-naive timestamps, and the engineering team is verifying how a literal string parses into that type.

Write a query to return the string '2024-06-15 14:30:00' cast as a timezone-naive timestamp.

Output:

  • A single row with one column, event_time, typed as a timezone-naive timestamp.
Schema · ecommerce 5 tables
categories
id integer
name text
parent_id? integer
products
id integer
name text
category_id integer
price numeric
stock_qty integer
attributes? jsonb
order_items
id integer
order_id integer
product_id integer
quantity integer
unit_price numeric
customers
id integer
name text
email text
city? text
country text
created_at timestamptz
is_active boolean
orders
id integer
customer_id integer
ordered_at timestamptz
status text
total_amount numeric
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Solution query
SELECT
  '2024-06-15 14:30:00'::TIMESTAMP AS event_time

The shape

The ::timestamp cast resolves the literal as a timezone-naive TIMESTAMP, which stores the wall-clock reading exactly as written with no time zone attached. That is the right type for a logging system that already records every event in its own local frame.

Clause by clause

  • SELECT '2024-06-15 14:30:00'::timestamp AS event_time evaluates the literal once and returns it as a single TIMESTAMP value. The cast is what binds the result column to TIMESTAMP; without it, PostgreSQL would resolve the literal as text and the column type would be wrong even though the displayed value matches.
  • There is no FROM because no table is being read; the literal supplies the value directly.

The trap

A bare '2024-06-15 14:30:00' looks like a timestamp but is a string. The result row will display the same characters, but the column's type is text, not TIMESTAMP, and any downstream operation that expects a real timestamp will either error out or trigger an implicit cast that depends on the session settings. The ::timestamp cast pins the destination type at write time, which is the only way to make the column safe to consume.

You practiced casting a literal datetime to TIMESTAMP — the type stores the wall-clock value as written, with no time zone attached.

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