Add timestamp column with default NOW for new rows only
5 Answers Sorted by 266 You need to add the column with a default of null then alter the column to have default now ALTER TABLE mytable ADD COLUMN created at TIMESTAMP ALTER TABLE mytable ALTER COLUMN created at SET DEFAULT now Share Improve this answer Follow answered Aug 12 2016 at 10 58 Philip Couling 13 9k 6 57 89 Add a comment 73
PostgreSQL Documentation 16 8 5 Date Time Types, The SQL standard requires that writing just timestamp be equivalent to timestamp without time zone and PostgreSQL honors that behavior timestamptz is accepted as an abbreviation for timestamp with time zone this is a PostgreSQL extension
PostgreSQL Documentation 16 5 2 Default Values
A common example is for a timestamp column to have a default of CURRENT TIMESTAMP so that it gets set to the time of row insertion Another common example is generating a serial number for each row In PostgreSQL this is typically done by something like
Postgresql How can I set a default now timestamp in a timestamp , 1 JohnBachir No TIMESTAMP both with and without time zone are stored exactly the same on Postgres
Understanding PostgreSQL Timestamp Data Types
Understanding PostgreSQL Timestamp Data Types, PostgreSQL provides you with two temporal data types for handling timestamp timestamp a timestamp without timezone one timestamptz timestamp with a timezone The timestamp datatype allows you to store both date and time However it does not have any time zone data
SQL Postgres Are Two Columns Of TIMESTAMP Type With DEFAULT NOW
How to Set a TIMESTAMP as a Default Column Value in PostgreSQL
How to Set a TIMESTAMP as a Default Column Value in PostgreSQL Postgres allows us to set a TIMESTAMP as the column s default value For this purpose the DEFAULT keyword is used with the targeted column at the time of table creation as shown below CREATE TABLE tbl name col name DATA TYPE DEFAULT default val
Postgres DB Date Timestamp Timezone postgresDB postgres TIMESTAMP
All the functions and operators described below that take time or timestamp inputs actually come in two variants one that takes time with time zone or timestamp with time zone and one that takes time without time zone or timestamp without time zone For brevity these variants are not shown separately 9 9 Date Time Functions and Operators PostgreSQL. The PostgreSQL CURRENT TIMESTAMP function returns the current date and time with time zone which is the time when the transaction starts Syntax The following illustrates the syntax of the PostgreSQL CURRENT TIMESTAMP function CURRENT TIMESTAMP precision Code language SQL Structured Query Language sql Arguments PostgreSQL offers multiple ways to get the current time of a database These are similar in intent but differ in usage It s possible to generate a unique timestamp but we re not sure when
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