The transaction_timestamp function behaves the same as current_timestamp. transaction_timestamp() and statement_timestamp() PostgreSQL also provides functions that return the start time of the current statement and the actual current time when the function is called. The following are supported non-SQL standard functions: (1 row) Supported non-SQL standard functions The CURRENT_DATE function shows the current date in yyyy-mm-dd format. If you want a consistent timestamp throughout the transaction, you can use these functions. This behavior is intentional and considered as a feature. There is no change in the value if you run these functions multiple times in the same transaction. These functions return the start time of the current transaction. CURRENT_TIMESTAMP/CURRENT_TIMESTAMP(precision).The following are supported SQL standard functions: Some of these functions are SQL standard, and others are non-SQL standard functions. PostgreSQL provides several functions that return values related to the current date and time. Overview of PostgreSQL date/time functions Daylight Saving Time (DST) consideration.Effect of client side-settings in time functions.Statement-level or transaction-level time.There are three different aspects to consider when evaluating the date/time function for Oracle and PostgreSQL: This post shows an alternative to the Oracle SYSDATE function for your PostgreSQL database. Tables with columns like creation_date, last_updated_date, approved_date are updated as SYSDATE values by having default values of the column as SYSDATE or by defining the trigger to insert or update column values as SYSDATE. SYSDATE is the most commonly used date/time function in applications or stored procedures and triggers. One of the most common issues while migrating from Oracle to Amazon RDS or Amazon Aurora PostgreSQL is with the SYSDATE function. For more information about the migration process, see Database Migration-What Do You Need to Know Before You Start?, Migration process and infrastructure considerations, Source database considerations, and Target database considerations for the PostgreSQL environment. July 2023: This post was reviewed for accuracy.Īn Oracle to PostgreSQL migration in the AWS Cloud can be a complex, multistage process with different technologies and skills involved, starting from the assessment stage to the cutover stage.
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