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How to Add Date And Time to Table In Postgresql?

2 minutes read

To add a date and time column to a table in PostgreSQL, you can use the following query:

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ALTER TABLE table_name
ADD column_name TIMESTAMP;


Replace table_name with the name of the table where you want to add the column, and column_name with the name of the column you want to create.


If you want to set a default value for the column, you can use the following query:

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ALTER TABLE table_name
ADD column_name TIMESTAMP DEFAULT current_timestamp;


This will set the default value of the column to the current date and time.


You can also specify a specific default value for the column by using the DEFAULT keyword followed by the desired date and time value.


After adding the column, you can insert date and time values into the table using the INSERT statement, specifying the column name in the query.


What is the purpose of using functions like NOW() and CURRENT_TIMESTAMP() when adding date and time in PostgreSQL?

The purpose of using functions like NOW() and CURRENT_TIMESTAMP() when adding date and time in PostgreSQL is to automatically insert the current date and time at the time of data insertion. This ensures that the database records accurately reflect when the data was added or modified, without the need for manual input of the date and time by the user. This can help maintain data integrity and consistency, and make it easier to track changes and updates to the database.


What is the process for deleting or dropping date and time columns from a table in PostgreSQL?

To delete or drop date and time columns from a table in PostgreSQL, you can use the following SQL command:

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ALTER TABLE table_name
DROP COLUMN column_name;


Make sure to replace table_name with the name of the table from which you want to delete the column, and column_name with the name of the date and time column you want to drop.


For example, if you have a table called employees and you want to delete a column named hire_date, you can run the following command:

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ALTER TABLE employees
DROP COLUMN hire_date;


This will remove the hire_date column from the employees table.


What is the default time zone used by PostgreSQL for date and time operations?

The default time zone used by PostgreSQL for date and time operations is UTC (Coordinated Universal Time).

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