在PostgreSQL中为timestamp列使用前缀和后缀的优缺点是什么？

Great question—this is a common dilemma when designing PostgreSQL schemas, especially when trying to balance clarity, consistency, and clean naming. Let’s break down the pros and cons, plus align with those naming convention best practices you mentioned.

Advantages of Using Prefixes/Suffixes #

• Instant clarity for anyone reading the schema: Names like created_at or updated_ts leave zero doubt that the column holds a timestamp tied to record creation or last modification. You don’t have to look up the column type to understand its purpose, which is a big win for quick schema scans or onboarding new team members.
• Prevents naming collisions: If you have a column that’s logically time-related but might clash with a reserved word or existing column (e.g., start could refer to a process start or a time), adding a suffix like _timestamp or prefix like ts_ removes ambiguity entirely.
• Builds consistent patterns across tables: When every timestamp column follows the same rule—say, all event timestamps end with _at—your schema becomes predictable. Team members will instantly recognize time-related columns without extra context, reducing mental friction.

Disadvantages of Using Prefixes/Suffixes #

• Redundant type information: PostgreSQL already enforces the timestamp (or timestamptz) data type for the column. Adding a suffix like _timestamp feels unnecessary—anyone with access to the schema can check the type directly. This bloat can make column names longer than needed, which can get cumbersome in queries.
• Risk of confusion with other time types: As you noted, using prefixes/suffixes that match other data types (like _date or _time) can lead to mistakes. For example, a column named event_date that’s actually a timestamp might make someone assume it only stores date values, leading to incorrect filter logic or application code.
• Rigidity if you need to change types: If you later switch the column from timestamp to timestamptz (to add timezone support), the suffix/prefix becomes misleading. You’ll either have to rename the column (a hassle in production) or keep a name that no longer accurately reflects the data type.

Naming Convention Best Practices to Follow #

You referenced guidelines that recommend using timestamp only for event-triggered values (like record creation/modification times) and avoiding type-matching prefixes/suffixes. Here’s how to apply that in PostgreSQL:

• Name columns by purpose, not type: Instead of order_ts, use order_placed—this tells you why the timestamp exists, not just what type it is. It’s far more descriptive and avoids tying the name to a specific data type.
• Steer clear of type-aligned names: Don’t use date_created for a timestamp column (since it includes time) or time_updated for a full timestamp. This prevents the confusion you mentioned between date/time types.
• Lock in a team-wide standard: Whether you opt for purpose-driven names or a subtle suffix like _at, make sure everyone on your team follows the same pattern. Consistency is key for long-term schema maintainability.

内容的提问来源于stack exchange，提问作者KoichiSenada